middotmiddot1

I I I I I SILRESIM SITE RIFS

middot1 LOWELL MASSACHUSETTS

PHASE TWO SAMPLING PLAN

I I I I

Prepared for Silresim Site Trustees

Acton Massachusetts

I I I Prepared by

Goldberg~Zoino amp Associates Inc Newton Upper Falls Massachusetts

I I I

File No A-4054~12 November 1986

I Copyrightreg 1986 Goldberg-Zoino amp Associates Inc bull

I

I DONALD T GOLDBERG WILLIAM S ZOINO JOSEPH D GUERTIN JR JOHN E AYRESI GZ MATTHEW J BARVENIK WILLIAM A BELOFFBERG bull ZOINO amp ASSOCIATES INC NICHOLAS A CAMPAGNA JR

I GEOTECHNICAL-GEOHYDROLOGICAL CONSULTANTS

I

File

Silresim Site Trust Post Off ice Box 169 Acton Massachusetts 02172

Attention Mr James Rogers

MATHEWA DIPILATO CARL EIDAM LAWRENCE FELDMAN JOSEPH P HEHIR ROBERT A HELLER ROSS T McGILLIVRAY MICHAEL A POWERSmiddot JAMES H REYNOLDS PAUL M SANBORN RICHARD M SIMON STEVEN J TRETIEL

CONSULTANTS

WALTER E JAWORSKI JR STAN~EY M BEMBEN

November 7 1986 No A-405412-C

Re Revised Deliverable 4 Silresim RI

middotI Gentlemen

I Attached please find a copy of the newly revised Deliverable 4 (Phase Two Sampling Plan) for the Silresim Remedial Investigation

I The current document addresses comments presented by the US EPA in letters dated August 13 and September 18 1986

I Should you have any questions on the revised study program or require any additional information please feel free to contact the undersigned

---_~)

1

I I LFdkr

I ~1

Very truly yours

GOLDBERG-ZOINO amp ASSOCIATES INC

Lawrence Feldman Project Manager

1 THE GEO BUILDINGbull 320 NEEDHAM STREETbull NEWTON UPPER FALLS MASSACHUSETTS02164bull 16171969-0050

BUFFALO NY bull BRIDGEPORT CT bull VERNON CT bull MANCHESTER NH bull PROVIDENCE RI bull TAMPA FL

AN EQUAL OPPORTUNITY EMPLOYER

I I I I

I 100

1i

i 200

1 I I

I 300

I I I I I 1 GZ

TABLE OF CONTE1NTS

INTRODUCTION 1

110 STATUS OF REMEDIAL INVESTIGATION 1

120 SCOPE OF DELIVERABLE 4 ]

IDENTIFICATION OF DATA LIMITATIONS 2

2 10 SURFACmiddotE WATERSEDIMENTS 2

220 SURFICIAL SOILS 3

230 CHARACTERIZATION OF BURIED OBJECTS 4

2 40 GROUNDWATmiddotER 4

241 Groundwater Flow 4 242 Contaminant Distribution in Groundwater 5

250 1 AIR QUALITY 6

PHASE TWO SAMPLING PROGRAM 6

310 SURFACE WATERSSEDIMENTS 6

320 SURFICIAL SOILS 7

3 30 CHARACTERIZmiddotATION OF BURIED OBJECTS 8

3 40 PHASE TWO WELL INSTALLATIONS 9

350 GROUNDWATER SAMPLING AND ANALYSES 10

11middotmiddot

-I TABLE OF CONTENTS (CONTD)

I

360 SEWER LINE STUDY 12

I 3 61 Background 12 3~62 Scope of Work 13

I 370 VENT MONITORING 16

400 GROUNDWATER MODELING 19

I 410 OBJECTIVES 19

420 NUMERICAL CODE

I 20

430 STUDY REGION 20

I 440 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC

FEATURES 20

450 CALIBRATION 21

I 460 SOLUTE TRANSPORT 22

I 500 PROPOSED PLAN FOR RISK ASSESSMENT 22

6 00middot EVALUATION AND SCREENING OF POTENTIAL RECEPTORS 31

I 610 ENVIRONMENTAL RELEASE MEDIA 31

620 EVALUATION OF POTENTIAL RECEPTORS 32

I 621 Groundwater 32 622 Surface Water 34 623 Sewer Lines 35

I 624 Soils 36 625 Air 37 626 Listing of Potential Receptors 38

I 700 REMEDIAL TECHNOLOGIES 38

I 800 UPDATES TO PROJECT OPmiddotERATION PLANS 38

I _ CiL I

I I

I I

middotI I I 11

I I I I I I I I 1

TABLES

TABLE NO 1

TABLmiddotE NO 2

TABLE NO 3

TABLE NO 4

FIGURES

FIGURE NO 1

FIGURE NO 2

FIGURE NO 3

FIGURE NO 4

APPENDICES

APPENDIX A

TABLE OF CONTENTS (CONTD)

COMPARISON OF voe vs EXTRACTABLE COMPOUND CONCENTRATIONS IN GROUNDWATER

INVENTORY OF POTmiddotENrIAL RECEPTORS

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

TARGET COMPOUONDS FOR SILRESIM VENT SAMPLING

SURmiddotFICIAL SOIL SAMPLING LOCATIONS

GEOPHYSICAL SURVEYBURIED METAL OBJECTS PLAN

PROPOSED WELLPIEZOMETER LOCATIONbullS

STUDY REGION FOR GROUNDWATER MODELING

PRELIMINARY SEWER SAMPLING RESULTS

I G11middot

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

I DONALD T GOLDBERG WILLIAM S ZOINO JOSEPH D GUERTIN JR JOHN E AYRESI GZ MATTHEW J BARVENIK WILLIAM A BELOFFBERG bull ZOINO amp ASSOCIATES INC NICHOLAS A CAMPAGNA JR

I GEOTECHNICAL-GEOHYDROLOGICAL CONSULTANTS

I

File

Silresim Site Trust Post Off ice Box 169 Acton Massachusetts 02172

Attention Mr James Rogers

MATHEWA DIPILATO CARL EIDAM LAWRENCE FELDMAN JOSEPH P HEHIR ROBERT A HELLER ROSS T McGILLIVRAY MICHAEL A POWERSmiddot JAMES H REYNOLDS PAUL M SANBORN RICHARD M SIMON STEVEN J TRETIEL

CONSULTANTS

WALTER E JAWORSKI JR STAN~EY M BEMBEN

November 7 1986 No A-405412-C

Re Revised Deliverable 4 Silresim RI

middotI Gentlemen

I Attached please find a copy of the newly revised Deliverable 4 (Phase Two Sampling Plan) for the Silresim Remedial Investigation

I The current document addresses comments presented by the US EPA in letters dated August 13 and September 18 1986

I Should you have any questions on the revised study program or require any additional information please feel free to contact the undersigned

---_~)

1

I I LFdkr

I ~1

Very truly yours

GOLDBERG-ZOINO amp ASSOCIATES INC

Lawrence Feldman Project Manager

1 THE GEO BUILDINGbull 320 NEEDHAM STREETbull NEWTON UPPER FALLS MASSACHUSETTS02164bull 16171969-0050

BUFFALO NY bull BRIDGEPORT CT bull VERNON CT bull MANCHESTER NH bull PROVIDENCE RI bull TAMPA FL

AN EQUAL OPPORTUNITY EMPLOYER

I I I I

I 100

1i

i 200

1 I I

I 300

I I I I I 1 GZ

TABLE OF CONTE1NTS

INTRODUCTION 1

110 STATUS OF REMEDIAL INVESTIGATION 1

120 SCOPE OF DELIVERABLE 4 ]

IDENTIFICATION OF DATA LIMITATIONS 2

2 10 SURFACmiddotE WATERSEDIMENTS 2

220 SURFICIAL SOILS 3

230 CHARACTERIZATION OF BURIED OBJECTS 4

2 40 GROUNDWATmiddotER 4

241 Groundwater Flow 4 242 Contaminant Distribution in Groundwater 5

250 1 AIR QUALITY 6

PHASE TWO SAMPLING PROGRAM 6

310 SURFACE WATERSSEDIMENTS 6

320 SURFICIAL SOILS 7

3 30 CHARACTERIZmiddotATION OF BURIED OBJECTS 8

3 40 PHASE TWO WELL INSTALLATIONS 9

350 GROUNDWATER SAMPLING AND ANALYSES 10

11middotmiddot

-I TABLE OF CONTENTS (CONTD)

I

360 SEWER LINE STUDY 12

I 3 61 Background 12 3~62 Scope of Work 13

I 370 VENT MONITORING 16

400 GROUNDWATER MODELING 19

I 410 OBJECTIVES 19

420 NUMERICAL CODE

I 20

430 STUDY REGION 20

I 440 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC

FEATURES 20

450 CALIBRATION 21

I 460 SOLUTE TRANSPORT 22

I 500 PROPOSED PLAN FOR RISK ASSESSMENT 22

6 00middot EVALUATION AND SCREENING OF POTENTIAL RECEPTORS 31

I 610 ENVIRONMENTAL RELEASE MEDIA 31

620 EVALUATION OF POTENTIAL RECEPTORS 32

I 621 Groundwater 32 622 Surface Water 34 623 Sewer Lines 35

I 624 Soils 36 625 Air 37 626 Listing of Potential Receptors 38

I 700 REMEDIAL TECHNOLOGIES 38

I 800 UPDATES TO PROJECT OPmiddotERATION PLANS 38

I _ CiL I

I I

I I

middotI I I 11

I I I I I I I I 1

TABLES

TABLE NO 1

TABLmiddotE NO 2

TABLE NO 3

TABLE NO 4

FIGURES

FIGURE NO 1

FIGURE NO 2

FIGURE NO 3

FIGURE NO 4

APPENDICES

APPENDIX A

TABLE OF CONTENTS (CONTD)

COMPARISON OF voe vs EXTRACTABLE COMPOUND CONCENTRATIONS IN GROUNDWATER

INVENTORY OF POTmiddotENrIAL RECEPTORS

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

TARGET COMPOUONDS FOR SILRESIM VENT SAMPLING

SURmiddotFICIAL SOIL SAMPLING LOCATIONS

GEOPHYSICAL SURVEYBURIED METAL OBJECTS PLAN

PROPOSED WELLPIEZOMETER LOCATIONbullS

STUDY REGION FOR GROUNDWATER MODELING

PRELIMINARY SEWER SAMPLING RESULTS

I G11middot

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

I I I I

I 100

1i

i 200

1 I I

I 300

I I I I I 1 GZ

TABLE OF CONTE1NTS

INTRODUCTION 1

110 STATUS OF REMEDIAL INVESTIGATION 1

120 SCOPE OF DELIVERABLE 4 ]

IDENTIFICATION OF DATA LIMITATIONS 2

2 10 SURFACmiddotE WATERSEDIMENTS 2

220 SURFICIAL SOILS 3

230 CHARACTERIZATION OF BURIED OBJECTS 4

2 40 GROUNDWATmiddotER 4

241 Groundwater Flow 4 242 Contaminant Distribution in Groundwater 5

250 1 AIR QUALITY 6

PHASE TWO SAMPLING PROGRAM 6

310 SURFACE WATERSSEDIMENTS 6

320 SURFICIAL SOILS 7

3 30 CHARACTERIZmiddotATION OF BURIED OBJECTS 8

3 40 PHASE TWO WELL INSTALLATIONS 9

350 GROUNDWATER SAMPLING AND ANALYSES 10

11middotmiddot

-I TABLE OF CONTENTS (CONTD)

I

360 SEWER LINE STUDY 12

I 3 61 Background 12 3~62 Scope of Work 13

I 370 VENT MONITORING 16

400 GROUNDWATER MODELING 19

I 410 OBJECTIVES 19

420 NUMERICAL CODE

I 20

430 STUDY REGION 20

I 440 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC

FEATURES 20

450 CALIBRATION 21

I 460 SOLUTE TRANSPORT 22

I 500 PROPOSED PLAN FOR RISK ASSESSMENT 22

6 00middot EVALUATION AND SCREENING OF POTENTIAL RECEPTORS 31

I 610 ENVIRONMENTAL RELEASE MEDIA 31

620 EVALUATION OF POTENTIAL RECEPTORS 32

I 621 Groundwater 32 622 Surface Water 34 623 Sewer Lines 35

I 624 Soils 36 625 Air 37 626 Listing of Potential Receptors 38

I 700 REMEDIAL TECHNOLOGIES 38

I 800 UPDATES TO PROJECT OPmiddotERATION PLANS 38

I _ CiL I

I I

I I

middotI I I 11

I I I I I I I I 1

TABLES

TABLE NO 1

TABLmiddotE NO 2

TABLE NO 3

TABLE NO 4

FIGURES

FIGURE NO 1

FIGURE NO 2

FIGURE NO 3

FIGURE NO 4

APPENDICES

APPENDIX A

TABLE OF CONTENTS (CONTD)

COMPARISON OF voe vs EXTRACTABLE COMPOUND CONCENTRATIONS IN GROUNDWATER

INVENTORY OF POTmiddotENrIAL RECEPTORS

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

TARGET COMPOUONDS FOR SILRESIM VENT SAMPLING

SURmiddotFICIAL SOIL SAMPLING LOCATIONS

GEOPHYSICAL SURVEYBURIED METAL OBJECTS PLAN

PROPOSED WELLPIEZOMETER LOCATIONbullS

STUDY REGION FOR GROUNDWATER MODELING

PRELIMINARY SEWER SAMPLING RESULTS

I G11middot

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

11middotmiddot

-I TABLE OF CONTENTS (CONTD)

I

360 SEWER LINE STUDY 12

I 3 61 Background 12 3~62 Scope of Work 13

I 370 VENT MONITORING 16

400 GROUNDWATER MODELING 19

I 410 OBJECTIVES 19

420 NUMERICAL CODE

I 20

430 STUDY REGION 20

I 440 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC

FEATURES 20

450 CALIBRATION 21

I 460 SOLUTE TRANSPORT 22

I 500 PROPOSED PLAN FOR RISK ASSESSMENT 22

6 00middot EVALUATION AND SCREENING OF POTENTIAL RECEPTORS 31

I 610 ENVIRONMENTAL RELEASE MEDIA 31

620 EVALUATION OF POTENTIAL RECEPTORS 32

I 621 Groundwater 32 622 Surface Water 34 623 Sewer Lines 35

I 624 Soils 36 625 Air 37 626 Listing of Potential Receptors 38

I 700 REMEDIAL TECHNOLOGIES 38

I 800 UPDATES TO PROJECT OPmiddotERATION PLANS 38

I _ CiL I

I I

I I

middotI I I 11

I I I I I I I I 1

TABLES

TABLE NO 1

TABLmiddotE NO 2

TABLE NO 3

TABLE NO 4

FIGURES

FIGURE NO 1

FIGURE NO 2

FIGURE NO 3

FIGURE NO 4

APPENDICES

APPENDIX A

TABLE OF CONTENTS (CONTD)

COMPARISON OF voe vs EXTRACTABLE COMPOUND CONCENTRATIONS IN GROUNDWATER

INVENTORY OF POTmiddotENrIAL RECEPTORS

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

TARGET COMPOUONDS FOR SILRESIM VENT SAMPLING

SURmiddotFICIAL SOIL SAMPLING LOCATIONS

GEOPHYSICAL SURVEYBURIED METAL OBJECTS PLAN

PROPOSED WELLPIEZOMETER LOCATIONbullS

STUDY REGION FOR GROUNDWATER MODELING

PRELIMINARY SEWER SAMPLING RESULTS

I G11middot

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

I I

I I

middotI I I 11

I I I I I I I I 1

TABLES

TABLE NO 1

TABLmiddotE NO 2

TABLE NO 3

TABLE NO 4

FIGURES

FIGURE NO 1

FIGURE NO 2

FIGURE NO 3

FIGURE NO 4

APPENDICES

APPENDIX A

TABLE OF CONTENTS (CONTD)

COMPARISON OF voe vs EXTRACTABLE COMPOUND CONCENTRATIONS IN GROUNDWATER

INVENTORY OF POTmiddotENrIAL RECEPTORS

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

TARGET COMPOUONDS FOR SILRESIM VENT SAMPLING

SURmiddotFICIAL SOIL SAMPLING LOCATIONS

GEOPHYSICAL SURVEYBURIED METAL OBJECTS PLAN

PROPOSED WELLPIEZOMETER LOCATIONbullS

STUDY REGION FOR GROUNDWATER MODELING

PRELIMINARY SEWER SAMPLING RESULTS

I G11middot

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

I I I 100 INTRODUCTION

I II

The following document represents the revised Deliverable 4 of the Silresim Site RIFS the Phase Two Sampling Plan This deliverable has been prepared by Goldberg-Zaino and Associates

I Inc (GZA) on behalf of the Silresim Site Trust for submittal to the US Environmental Protection Agency (EPA) The Phase Two Sampling Plan outlines the final stage of field investigation and samplinganalysis ~or the RI at the Silresim Site

ii 110 STATUS OF REMEDIAL INVESTIGATION

I The Silresim RI bas progressed from preparation of Project Operashytion Plans through planning and implementation of Phase One f ield studies Preliminary results of the Phase One work were discusshysed in Beliverable 3 (dated May 1 1986) and in follow-up correshyspondence of May 30 1986 In the current document the implicashytions of these results in terms of data limitations and the required scope of Phase Two explorations and testing are briefly discussed

120 SCOPE OF DELIVERABLE 41middot The specific scope of Deliverable 4 is outlined in Section 52 of the CDM RIFS Work Plan Items identified in this section andImiddot covered in the present document are identified below and referenshyced to the appropriate sections of this report~

I 1 Phase One sampling results and analyses - Sections 210-250

I 2 Evaluation of need for further air surface water sediment

soil and geophysical tasks - Sections 210-250

3 Selection of media sampling necessity - Sections 310-370 bull

I 4 Data expectations regarding f illing data gaps for modeling - middot Section 241

5 Initial plan for endangerment assessment - Section 400

I 1

I C1I

I

middotI

6 Updates to Silresim Project Operation Plans - Section 7-00

7 Preliminary list of remedial options - Section 600

8 Evaluation and screening of potential receptors - Section 500

200 IDENTIFICATION OF DATA LIMITATIONS

Based on the results of the Phase One sampling program and on previous studies completed by other investigators GZA has identi shyfied a number of data gaps to be addressed during the Phase Two investigation These are summarized briefly in the following sections divided in terms of the relevant environmental media middot

2 10 SURFACE WATERSEDIMENTS

The primary surface water bodies within the study area - River Meadow Brook and East Pondbull - appear to be adequately character shyi zed at this point in time Analytical results on water and sediment samples from these locations domiddotnot suggest the presence of significant levels of Silresim-related contaminants The presence of low levels of common environmental pollutants (eg volatile organic compounds and polynuclear aromatic hydrocarbons) observed in sediments from these water bodies is not unusual in an urban industrialized area

Concern was expressed within the RIFS work plan regarding potential transport of contaminants via runoff from the Sil~esim Site Accordingly a sampling program for runoff from the clay cap and the crushed stone area south of the site was planned GZAs several attempts at collecting the designated runoff and drain line samples ( SW-4 S 8 and 9 )middot have been unsucces s fu 1 due to lack of sufficient flow However during these attempts GZA has made the following observations regarding storm runoff in the study area

a Mosmiddott of the runoff from the clay capped area is channeled to the catch basin at the northwest corner of the site via the caps drainage swale

b Except during major storms this runoff percolates into the ground around the outside perimeter of the catch basin and dmiddotoes not enter the Tanner Street storm drainage system GZA has not observed discbarge from the on-site manhole to the

2

I GZ I

Tanner Street drainage system during our activities at the site but the presence of clayey sediments at the storm drain outfall to River Meadow Brook suggests that this has occurshyred

I c Storm runoff from at least one adjacent site along Tanner

Street is visibly contaminated with oily residues

I d Runoff from the crushed stone area south of the clay cap

collects in small pools on the Arrow carrier site No runoff channel or other drainage system which could conduct this flow off-site has been observed by GZA

I It is noted that storm runoff from the capped area would not be

I anticipated to contain contaminants from the Silresim site since no waste materials are exposed While contaminated soils may be present at or c 1 os e to ground s u r f ace at c er ta i n 1 o c at i on s between the site and the Arrow Carrier Building observed runoff patterns do not indicate the potential for migration of contaminshy

I ants via surface water flow In light of these considerations and the observations above it is GZAs opinion that storm runoff is not a significant trar1sport mechanism for contaminants at the Silresim site

220 SURFICIAL SOILS bull ___

Phase One studies have documented three areas of surf icial schl contamination around the perimeter of the Silresim site

a Arrow carrier lot

I b Southeast corner of the site (vicinity of SS-1)

I c Strip along eastern border of site adjacent to Boston amp Maine railroad grade

I These areas as well as locations of previous surficial soil samples at the site are shown on Figure 1 Specific data needs with respect to surficial soils beyond the limits of the clay cap are as follows

I a Extent of contamination by trace metals along the Boston and Maine railroad grade adjacent to the site bull

1 b Distribution of voe contamination in the vicinity of GZA perimeter samples 68 and 69

I I

3

I GZ I

I I c Southern extent of surficial contamination by base neutral

extract~ble compounds and metals at the southeast corner of the site

d Distribution of surficial soil contamination between the site and the Arrow Carrier building

230 CHARACTERIZATION OF BURIED OBJECTS

The Silresim site has been extensively characterized by geophysshyical techniques which have identified a total of fourteen possible buried ferrous objects below the clay cap Of this total six are judged to be of sufficient size to constitute

I potential sources of contamination such as 55-gallon drums or storage tanks These are identified as Buried Objects (BOs) 1 4 5 6 8 and 9 as shown on Figure 2 Further characterizashy

1middot tion of possible continuing sources of contamination at the site will focus on direct investigations of these six buried objects

I 240 GROUNDWATER

Under the general heading of 9roundwater are two related but sqmewhat distinct issues character i zation of groundwater flow and delineation of contat(inant distribution~ )ossmiddoti~ble data limitations with respect to these items are di~~ussedmiddotin the following sections

241 Groundwater Flow

I Despite the substantial number of groundwater monitoring

points available (more than 55 measuring points currently exist

I at the site) refinements in the characterization of the flow regime in the study area are required As detailedin Delivershyable 3 GZA is presently developing a three-dimensional computer

II fl6~model of the site Basemiddotd on considerations derived from prehYiminary work on this task and on the results of the Phase One well installation and monitoring program the following additionshyal data needs have been identified

a Determination of the extent and possible source of apparent

I groundwater mounding observed beneath the northeast corner of the site While GZA had previously hypothesized that this mound was due to leakage from an old water line subshy

I sequent work indicated that the only water line in the area identified by the Lowell Water Department was not the source

I I

4

1 GZ J I

b Delineationmiddot of groundwater flow patterns south of the site including an evaluation of the potentia1 influence of sewer lines along Canada and Maple Streets

c Identification of discharge areas for groundwater flowing east from the site

d Distribution of piezometric heads northeast of the site

e EvaluatiomiddotA of the effects of the middotTanner Street branch sewer on groundwater flow patterns along the western border of the site and the efficiency of the sewer as a groundwater intershyceptor

242 Contaminant Distribution in Groundwater

Contaminant distr ibution in groundwater at the site appears to be generally well characterized based on the Phase One data Based on previous groundwater analyses and on data developeq during GZAs studies it is apparent that voes are the contammiddotinshyants of primary concern with respect to migration from the site This point is well illustrated by the data summarized on Table 1 which compares relative concentrations of volatile and extractshyable organicsmiddot in groundwater samples from the Silresim site

Ii

Tabulated data includes samples collected by NUS in 1983 as well as those collected during the present study in December 1985 Wells listed in the tabulation include tbose from the center of the plume within t_he site (MW-101A and MW-101B) from the leading edges of the highly contaminated portion of the plume off-site CMW-105A and MW-102B) and from the fringes of the plume (MW-106A and MW-I06B) Viewed in total the data clearly indicate voes as the primary contaminants in groundwater at the site with extractables accounting for less than 7 percent of the total organic contamination Furthermore a review of the specific extractables reported indicates that these constituents are of secondary concern from a toxicological standpoint as well as being less mobile than the voes

In summary~ Phase Two groundwater analyses should focus onI(

I

voes with only a limited program of full-spectrum testing Thus the voe screening techriiques used during Phase One should provide a reliable surrogate for mapping the contaminant plume There is a need however for con f i rmat i on o f s c re en i n g r es ul ts at selected locations via GCMS analyses and for more comprehensive plume characteri zation at specific wells

I I

I GZ ~

Tanner Street drainage system during our activities at the site but the presence of clayey sediments at the storm drain outfall to River Meadow Brook suggests that this has occurshyred

I c Storm runoff from at least one adjacent site along Tanner

Street is visibly contaminated with oily residues

I d Runoff from the crushed stone area south of the clay cap

collects in small pools on the Arrow carrier site No runoff channel or other drainage system which could conduct this flow off-site has been observed by GZA

I It is noted that storm runoff from the capped area would not be

I anticipated to contain contaminants from the Silresim site since no waste materials are exposed While contaminated soils may be present at or c 1 os e to ground s u r f ace at c er ta i n 1 o c at i on s between the site and the Arrow Carrier Building observed runoff patterns do not indicate the potential for migration of contaminshy

I ants via surface water flow In light of these considerations and the observations above it is GZAs opinion that storm runoff is not a significant trar1sport mechanism for contaminants at the Silresim site

220 SURFICIAL SOILS bull ___

Phase One studies have documented three areas of surf icial schl contamination around the perimeter of the Silresim site

a Arrow carrier lot

I b Southeast corner of the site (vicinity of SS-1)

I c Strip along eastern border of site adjacent to Boston amp Maine railroad grade

I These areas as well as locations of previous surficial soil samples at the site are shown on Figure 1 Specific data needs with respect to surficial soils beyond the limits of the clay cap are as follows

I a Extent of contamination by trace metals along the Boston and Maine railroad grade adjacent to the site bull

1 b Distribution of voe contamination in the vicinity of GZA perimeter samples 68 and 69

I I

3

I GZ I

I I c Southern extent of surficial contamination by base neutral

extract~ble compounds and metals at the southeast corner of the site

d Distribution of surficial soil contamination between the site and the Arrow Carrier building

230 CHARACTERIZATION OF BURIED OBJECTS

The Silresim site has been extensively characterized by geophysshyical techniques which have identified a total of fourteen possible buried ferrous objects below the clay cap Of this total six are judged to be of sufficient size to constitute

I potential sources of contamination such as 55-gallon drums or storage tanks These are identified as Buried Objects (BOs) 1 4 5 6 8 and 9 as shown on Figure 2 Further characterizashy

1middot tion of possible continuing sources of contamination at the site will focus on direct investigations of these six buried objects

I 240 GROUNDWATER

Under the general heading of 9roundwater are two related but sqmewhat distinct issues character i zation of groundwater flow and delineation of contat(inant distribution~ )ossmiddoti~ble data limitations with respect to these items are di~~ussedmiddotin the following sections

241 Groundwater Flow

I Despite the substantial number of groundwater monitoring

points available (more than 55 measuring points currently exist

I at the site) refinements in the characterization of the flow regime in the study area are required As detailedin Delivershyable 3 GZA is presently developing a three-dimensional computer

II fl6~model of the site Basemiddotd on considerations derived from prehYiminary work on this task and on the results of the Phase One well installation and monitoring program the following additionshyal data needs have been identified

a Determination of the extent and possible source of apparent

I groundwater mounding observed beneath the northeast corner of the site While GZA had previously hypothesized that this mound was due to leakage from an old water line subshy

I sequent work indicated that the only water line in the area identified by the Lowell Water Department was not the source

I I

4

1 GZ J I

b Delineationmiddot of groundwater flow patterns south of the site including an evaluation of the potentia1 influence of sewer lines along Canada and Maple Streets

c Identification of discharge areas for groundwater flowing east from the site

d Distribution of piezometric heads northeast of the site

e EvaluatiomiddotA of the effects of the middotTanner Street branch sewer on groundwater flow patterns along the western border of the site and the efficiency of the sewer as a groundwater intershyceptor

242 Contaminant Distribution in Groundwater

Contaminant distr ibution in groundwater at the site appears to be generally well characterized based on the Phase One data Based on previous groundwater analyses and on data developeq during GZAs studies it is apparent that voes are the contammiddotinshyants of primary concern with respect to migration from the site This point is well illustrated by the data summarized on Table 1 which compares relative concentrations of volatile and extractshyable organicsmiddot in groundwater samples from the Silresim site

Ii

Tabulated data includes samples collected by NUS in 1983 as well as those collected during the present study in December 1985 Wells listed in the tabulation include tbose from the center of the plume within t_he site (MW-101A and MW-101B) from the leading edges of the highly contaminated portion of the plume off-site CMW-105A and MW-102B) and from the fringes of the plume (MW-106A and MW-I06B) Viewed in total the data clearly indicate voes as the primary contaminants in groundwater at the site with extractables accounting for less than 7 percent of the total organic contamination Furthermore a review of the specific extractables reported indicates that these constituents are of secondary concern from a toxicological standpoint as well as being less mobile than the voes

In summary~ Phase Two groundwater analyses should focus onI(

I

voes with only a limited program of full-spectrum testing Thus the voe screening techriiques used during Phase One should provide a reliable surrogate for mapping the contaminant plume There is a need however for con f i rmat i on o f s c re en i n g r es ul ts at selected locations via GCMS analyses and for more comprehensive plume characteri zation at specific wells

I I

I GZ ~

I I c Southern extent of surficial contamination by base neutral

extract~ble compounds and metals at the southeast corner of the site

d Distribution of surficial soil contamination between the site and the Arrow Carrier building

230 CHARACTERIZATION OF BURIED OBJECTS

The Silresim site has been extensively characterized by geophysshyical techniques which have identified a total of fourteen possible buried ferrous objects below the clay cap Of this total six are judged to be of sufficient size to constitute

I potential sources of contamination such as 55-gallon drums or storage tanks These are identified as Buried Objects (BOs) 1 4 5 6 8 and 9 as shown on Figure 2 Further characterizashy

1middot tion of possible continuing sources of contamination at the site will focus on direct investigations of these six buried objects

I 240 GROUNDWATER

Under the general heading of 9roundwater are two related but sqmewhat distinct issues character i zation of groundwater flow and delineation of contat(inant distribution~ )ossmiddoti~ble data limitations with respect to these items are di~~ussedmiddotin the following sections

241 Groundwater Flow

I Despite the substantial number of groundwater monitoring

points available (more than 55 measuring points currently exist

I at the site) refinements in the characterization of the flow regime in the study area are required As detailedin Delivershyable 3 GZA is presently developing a three-dimensional computer

II fl6~model of the site Basemiddotd on considerations derived from prehYiminary work on this task and on the results of the Phase One well installation and monitoring program the following additionshyal data needs have been identified

a Determination of the extent and possible source of apparent

I groundwater mounding observed beneath the northeast corner of the site While GZA had previously hypothesized that this mound was due to leakage from an old water line subshy

I sequent work indicated that the only water line in the area identified by the Lowell Water Department was not the source

I I

4

1 GZ J I

b Delineationmiddot of groundwater flow patterns south of the site including an evaluation of the potentia1 influence of sewer lines along Canada and Maple Streets

c Identification of discharge areas for groundwater flowing east from the site

d Distribution of piezometric heads northeast of the site

e EvaluatiomiddotA of the effects of the middotTanner Street branch sewer on groundwater flow patterns along the western border of the site and the efficiency of the sewer as a groundwater intershyceptor

242 Contaminant Distribution in Groundwater

Contaminant distr ibution in groundwater at the site appears to be generally well characterized based on the Phase One data Based on previous groundwater analyses and on data developeq during GZAs studies it is apparent that voes are the contammiddotinshyants of primary concern with respect to migration from the site This point is well illustrated by the data summarized on Table 1 which compares relative concentrations of volatile and extractshyable organicsmiddot in groundwater samples from the Silresim site

Ii

Tabulated data includes samples collected by NUS in 1983 as well as those collected during the present study in December 1985 Wells listed in the tabulation include tbose from the center of the plume within t_he site (MW-101A and MW-101B) from the leading edges of the highly contaminated portion of the plume off-site CMW-105A and MW-102B) and from the fringes of the plume (MW-106A and MW-I06B) Viewed in total the data clearly indicate voes as the primary contaminants in groundwater at the site with extractables accounting for less than 7 percent of the total organic contamination Furthermore a review of the specific extractables reported indicates that these constituents are of secondary concern from a toxicological standpoint as well as being less mobile than the voes

In summary~ Phase Two groundwater analyses should focus onI(

I

voes with only a limited program of full-spectrum testing Thus the voe screening techriiques used during Phase One should provide a reliable surrogate for mapping the contaminant plume There is a need however for con f i rmat i on o f s c re en i n g r es ul ts at selected locations via GCMS analyses and for more comprehensive plume characteri zation at specific wells

I I

I GZ ~

b Delineationmiddot of groundwater flow patterns south of the site including an evaluation of the potentia1 influence of sewer lines along Canada and Maple Streets

c Identification of discharge areas for groundwater flowing east from the site

d Distribution of piezometric heads northeast of the site

e EvaluatiomiddotA of the effects of the middotTanner Street branch sewer on groundwater flow patterns along the western border of the site and the efficiency of the sewer as a groundwater intershyceptor

242 Contaminant Distribution in Groundwater

Contaminant distr ibution in groundwater at the site appears to be generally well characterized based on the Phase One data Based on previous groundwater analyses and on data developeq during GZAs studies it is apparent that voes are the contammiddotinshyants of primary concern with respect to migration from the site This point is well illustrated by the data summarized on Table 1 which compares relative concentrations of volatile and extractshyable organicsmiddot in groundwater samples from the Silresim site

Ii

Tabulated data includes samples collected by NUS in 1983 as well as those collected during the present study in December 1985 Wells listed in the tabulation include tbose from the center of the plume within t_he site (MW-101A and MW-101B) from the leading edges of the highly contaminated portion of the plume off-site CMW-105A and MW-102B) and from the fringes of the plume (MW-106A and MW-I06B) Viewed in total the data clearly indicate voes as the primary contaminants in groundwater at the site with extractables accounting for less than 7 percent of the total organic contamination Furthermore a review of the specific extractables reported indicates that these constituents are of secondary concern from a toxicological standpoint as well as being less mobile than the voes

In summary~ Phase Two groundwater analyses should focus onI(

I

voes with only a limited program of full-spectrum testing Thus the voe screening techriiques used during Phase One should provide a reliable surrogate for mapping the contaminant plume There is a need however for con f i rmat i on o f s c re en i n g r es ul ts at selected locations via GCMS analyses and for more comprehensive plume characteri zation at specific wells

I I

I GZ ~

I ~ limited number of gaps exist in the arealvertical

characterization of contaminant distribution in groundwater at the site These are summarized below middot

a Southern and southeastern extent of contaminant migration

b Groundwater quality northeast of the site on Boston and Maine property

c Vertical distribution of contamination in the immediate vicinity of the Tanner Street branch sewer

d Groundwater quality just west and north of the main and branch sewers along Tanner Street and the Lowell Iron and Steel property

e Downstream impacts of contaminated groundwater discharge into the 84-inch main sewer line

250 AIR QUALITY

Existing data appears generally adequate to characterize air

I quality in the vicinity of the Silresim Site as well as to

I project potential impacts during possible remedial activities A sorbent tube sampling program designed to identify and quantity voes emanating from the cap vents (as mandated by the CDM work plan) will be completed during Phamiddotse Two studies as outlined in Section 360 Upon completion of this work the only remaining data limitation with respect to the cap vents concerns the assessshy

middot1 ment of the need for and utility of the venting system

- 300 PHASE TWO SAMPLING PROGRAM

I The proposedmiddot Phasmiddote Two sampling program developed to address the data limitations described in the previous section is outlined

in the following paragraphs Exploration activities are subdividshyed in terms of the relevant environmental media in accordance

I with the CDM Work Plan

3 10 SURFACE WATERSSmiddotEDIMENTS

I I Up to four additional surface water samples for HSL analyses were

middot proposed in the work plan to evaluate the quali ty of runoff from areas covered with clay or gravel and to delineate the possible effects of this runoff on River Meadow Brook For the reasons

1 6

I G1 I

I I discussed in Section 210 GZA feels that this testing is unnecesshy

sary for the purposes of the RI Thus no additional surface watersediment sampling is proposed for the Phase Two investigashy

I tion

320 SURFICIAL SOILS

I I The Phase Two surficial soil sampling program will follow closely

the proposed work plan guidelines focusing on the three areas identified in Section 220 A total of five additional samples will be collected for HSL analyses including two from the eastern border of the site one composite sample from the vicinity of SS-1 and two samples from the Arrow Carrier lot Locations of Proposed Phase Two surficial soil samples are shown on Figure l Sampling and amiddotnalytical protocols willmiddot be identical to those employed during the Phase One sampling

I In addition to the priority pollutant sampling voe screening by headspace GC procedures will be conducted on surficial soil samples collected along the eastern border of the site and in th~ central portion of the Arrow Carrier lot to better define

I contaminant distribution in these areas This screening will be conducted in accordance with procedures employed in previous sampling programs as outlined in Deliverable 3 Also three

I additional surf icial soil samples will be collected from the eastern border of the site and analyzed for arsenic chromium and mercury to delineate the extent of contamination by the trace metals documented in Deliverable 2 These locations are also displayed on Figure 1

I HSL analyses of Surficial Soil Samples collected by NUS and GZA

-1 on the Silresim site have revealed fairly consistent contaminant types and relative concentrations across the site While extractshyable organic compounds occur regularly voes are the primari

I contaminants at the site with a wide range of specific constishytuents typically present Given the primacy of voes as an indicator of contamination at the site it is GZA s opinion that the extensive characterization of voe contamination on-site by Perkins Jordan is an adequate assessment of soil contamination below the capped area Consequently~ GZA does not propose to modify the CDM work plan by adding a surficial soil sampling program in the capped area It is noted however that the US EPA will be conducting HSL analyses on selected soil samples collected during monitoring well isntallations and test pi ts in the capped area

I 7

GZ

I I 3 3middot0 CHARACTERIZATION OF BURIED OBJECTS

To identify the six potentially significant buried objects a

I test pit pr og ram w i 11 be conducted by G Z A bull Test pits w i 11 be excavated through the clay cap at the locations of BOs 1 4 5 6 8 and 9 on Figure 2 Test pits will be excavated by a contracted backhoe and will be observed and loggmiddoted by a GZA geologist or engineer Each test pit will extend to the depth of the buried object ipound encountered or the the maximum reach of the backhoe (at least 12 feet) GZA personnel will attempt to visually identify and characterize any buried objects encountershyed

I _

I I

Initially clay and gravel fill associated with the cap construcshytion will be excavated at each test pit location These materials will be segregated adjacent to the excavatiori Each test pit will then be excavated to the required depth with excavated soils placed on a polyethylene liner and covered with polyethylene sheeting Upon completion of the test pits contaminated soils will be replaced in the excavations The backhoe will then be decontaminated by hot water power rinsing or

I steam cleaning Clean granular and clay fills will then be replaced at the top of the excavation and compacted with the backhoe bucket Efforts wi 11 be made to restore the cap to its original condition upon completion of the test pit program

1 During the test pit excavations GZA will screen soil samples collected atl- to 2-foot intervals using an H-Nu Model PI-101 Results of the screening will be transmitted to the US EPAs representative on-site It is GZAs understanding ~hat EPA will

I then select locations for soil samples for HSL analysis based on

I screening results and visual observations GZA personnel will collect the samples from the test pit walls or backhoe bucket using a stainless steel soil trowel in bottles provided by the Roy F Weston Laboratory Sample containers will then be provided to the EPA~s representative on-site

I Where feasible attempts will be made to sample the contents of any intact containers encountered However close observation or sampling of possible waste containers may be limited by health

I and saf~ty considerations Samples collected will be primarily

I for visual characterization or voe screening~ no significant chemical testing program for the test pit excavations is presentshyly proposed Tanks or drums if encountered will not be removed from the excavations but will be clearly marked for future referencmiddote GZA will log soil conditions stratigraphy ground-

I I

8

I G1 I

I I water levels and descriptions of buried objects encountered

during the explorations

Health and safety considerations will be dictated by the site Health and Safety Plan CPOP-315) It is anticipated that excavation work will begin in modified level C personnel protecshytion with provisions to upgrade to levels C and B

340 PHASE TWO WELL INSTALLATIONS

For the Phase Two groundwater investigation twelve additional monitoring wells are proposed These new monitoring wells will be supplemented by the installation of eight piezometers designed to provide groundwater elevation dmiddotata in the shallow aquifer to aid in model development The locations of proposed wells and piezometers are presented on Figure 3

Wells 401 402 and 403 are planned to evaluate the southern and eastern extent of contaminant migration and to provide data on piezometric head distribution These wells will be advanced until a minimum of 10 feet of uncontaminated material has been encountered below the water table Wells 404 405 406 and 412 will be shallow wells aimed at delineating the extent of ohserved mounding below the site refining the characterization of contaminant distribution on-site and evaluating potential source areas

I Wells 407 and 408 will be multi-level wells on either sidmiddote of the

1

Tanner Street branch sewer~- both installations will include a shallow wellscreen spanning the water table at the level of the sewer line and a deep screen set at approximately 3 0 feet dependshying upon subs-urf ace conditions encountered Well 409 will be a multi-level installation on the north side of the main sewer line with wellscreens set at depths eguivalent to those -ofmiddot well MW-315 middot (15 feet and 30 feet) In addition deep piezometers set above rock but below the sewer invert will be installed at wells 315 and 409

At locations 41middot0 and 411 drilling will advance until at least 10 feet of uncontaminated material has been encountered based on field screening results Either a shallow well or multi-level installatimiddoton will be employed at each location depending upon subsurface conditions encountered

I I Pie zometers Cidentif ie-d as P-413 through P-420 on Figure 3) will

be located around the southern and eastern fringes of the study area These piezometers are intended solely to provide data on groundwater flow patterns including both regional flow trends

I 9

I GL I

I I and the possible localized hydraulic effects of the Canada and

Maple Street sewer lines

I Monitomiddotring wells will be installed in accordance with procedures

I outlined in sections 420 and 430 of the Phase One Sampling Plan and the relevarit GZA SOPs (SOPs 111 112 and 21) An exception to the specified procedures will entail the use of hollow stern augers for the shallow wells as described in Section 35-0 of Deliverable 3

I Piezometers will be i_nstalled in accordance with GZA SOP 21 in bor~holes advanced by hollow stem augec techniques where possible The proposed pie~orneter locations are in portions of the study

I area where contamination related to the Silresirn site is n-0t

I anticipated at the shallow depths involved Consequently piezoshyrneter drilling and installation techniques will differ from monitoring well procedures in the following points

I a Drillirig equipment will not be decontaminated between

borings unless obvious evidence of contamination ( in the form of elevated screening results) is encountered

I b Cement-bentonite grout above bentonite seals will be omitted

for shallow rnoni tor ing wells

I c In areas where drill rig access is difficult (eg P-417 and

P-418) borings may be advanced by hand augers and piezoshyrneters may consist of galvanized steel well points hand driven into the shallow aquifer

I 350 GROUNDWATER SAMPLING AND ANALYSES

I I

Upon completion of the Phase Two well installation program previously existing Phase One and Phase Two monitoring wells will be sampled for field testing (pH specific conductance and dissolved oxygen) and voe screening Up to 4 0 rnoni tor ing points will also be analyzed for HSL voes plus tetrahydrofuran dimethyl sulfide and trichlorofluorornethane via EPA Method 624 In addition six locations will be selected for full spectrum HSL analysis Selection of specific monitoring points for voe and

I HSL testing will be made upon completion of the Phase Two well

I installation and groundwater screening program Water quality samples will be collemiddotcted only from those shallow piezometers where field screening of groundwater indicates signif icant levels of voes (ie bulldetectable levels of individual volatiles based on Ge screening datagt bull

I I

10

I CL I

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I discussed in Section 210 GZA feels that this testing is unnecesshy

sary for the purposes of the RI Thus no additional surface watersediment sampling is proposed for the Phase Two investigashy

I tion

320 SURFICIAL SOILS

I I The Phase Two surficial soil sampling program will follow closely

the proposed work plan guidelines focusing on the three areas identified in Section 220 A total of five additional samples will be collected for HSL analyses including two from the eastern border of the site one composite sample from the vicinity of SS-1 and two samples from the Arrow Carrier lot Locations of Proposed Phase Two surficial soil samples are shown on Figure l Sampling and amiddotnalytical protocols willmiddot be identical to those employed during the Phase One sampling

I In addition to the priority pollutant sampling voe screening by headspace GC procedures will be conducted on surficial soil samples collected along the eastern border of the site and in th~ central portion of the Arrow Carrier lot to better define

I contaminant distribution in these areas This screening will be conducted in accordance with procedures employed in previous sampling programs as outlined in Deliverable 3 Also three

I additional surf icial soil samples will be collected from the eastern border of the site and analyzed for arsenic chromium and mercury to delineate the extent of contamination by the trace metals documented in Deliverable 2 These locations are also displayed on Figure 1

I HSL analyses of Surficial Soil Samples collected by NUS and GZA

-1 on the Silresim site have revealed fairly consistent contaminant types and relative concentrations across the site While extractshyable organic compounds occur regularly voes are the primari

I contaminants at the site with a wide range of specific constishytuents typically present Given the primacy of voes as an indicator of contamination at the site it is GZA s opinion that the extensive characterization of voe contamination on-site by Perkins Jordan is an adequate assessment of soil contamination below the capped area Consequently~ GZA does not propose to modify the CDM work plan by adding a surficial soil sampling program in the capped area It is noted however that the US EPA will be conducting HSL analyses on selected soil samples collected during monitoring well isntallations and test pi ts in the capped area

I 7

GZ

I I 3 3middot0 CHARACTERIZATION OF BURIED OBJECTS

To identify the six potentially significant buried objects a

I test pit pr og ram w i 11 be conducted by G Z A bull Test pits w i 11 be excavated through the clay cap at the locations of BOs 1 4 5 6 8 and 9 on Figure 2 Test pits will be excavated by a contracted backhoe and will be observed and loggmiddoted by a GZA geologist or engineer Each test pit will extend to the depth of the buried object ipound encountered or the the maximum reach of the backhoe (at least 12 feet) GZA personnel will attempt to visually identify and characterize any buried objects encountershyed

I _

I I

Initially clay and gravel fill associated with the cap construcshytion will be excavated at each test pit location These materials will be segregated adjacent to the excavatiori Each test pit will then be excavated to the required depth with excavated soils placed on a polyethylene liner and covered with polyethylene sheeting Upon completion of the test pits contaminated soils will be replaced in the excavations The backhoe will then be decontaminated by hot water power rinsing or

I steam cleaning Clean granular and clay fills will then be replaced at the top of the excavation and compacted with the backhoe bucket Efforts wi 11 be made to restore the cap to its original condition upon completion of the test pit program

1 During the test pit excavations GZA will screen soil samples collected atl- to 2-foot intervals using an H-Nu Model PI-101 Results of the screening will be transmitted to the US EPAs representative on-site It is GZAs understanding ~hat EPA will

I then select locations for soil samples for HSL analysis based on

I screening results and visual observations GZA personnel will collect the samples from the test pit walls or backhoe bucket using a stainless steel soil trowel in bottles provided by the Roy F Weston Laboratory Sample containers will then be provided to the EPA~s representative on-site

I Where feasible attempts will be made to sample the contents of any intact containers encountered However close observation or sampling of possible waste containers may be limited by health

I and saf~ty considerations Samples collected will be primarily

I for visual characterization or voe screening~ no significant chemical testing program for the test pit excavations is presentshyly proposed Tanks or drums if encountered will not be removed from the excavations but will be clearly marked for future referencmiddote GZA will log soil conditions stratigraphy ground-

I I

8

I G1 I

I I water levels and descriptions of buried objects encountered

during the explorations

Health and safety considerations will be dictated by the site Health and Safety Plan CPOP-315) It is anticipated that excavation work will begin in modified level C personnel protecshytion with provisions to upgrade to levels C and B

340 PHASE TWO WELL INSTALLATIONS

For the Phase Two groundwater investigation twelve additional monitoring wells are proposed These new monitoring wells will be supplemented by the installation of eight piezometers designed to provide groundwater elevation dmiddotata in the shallow aquifer to aid in model development The locations of proposed wells and piezometers are presented on Figure 3

Wells 401 402 and 403 are planned to evaluate the southern and eastern extent of contaminant migration and to provide data on piezometric head distribution These wells will be advanced until a minimum of 10 feet of uncontaminated material has been encountered below the water table Wells 404 405 406 and 412 will be shallow wells aimed at delineating the extent of ohserved mounding below the site refining the characterization of contaminant distribution on-site and evaluating potential source areas

I Wells 407 and 408 will be multi-level wells on either sidmiddote of the

1

Tanner Street branch sewer~- both installations will include a shallow wellscreen spanning the water table at the level of the sewer line and a deep screen set at approximately 3 0 feet dependshying upon subs-urf ace conditions encountered Well 409 will be a multi-level installation on the north side of the main sewer line with wellscreens set at depths eguivalent to those -ofmiddot well MW-315 middot (15 feet and 30 feet) In addition deep piezometers set above rock but below the sewer invert will be installed at wells 315 and 409

At locations 41middot0 and 411 drilling will advance until at least 10 feet of uncontaminated material has been encountered based on field screening results Either a shallow well or multi-level installatimiddoton will be employed at each location depending upon subsurface conditions encountered

I I Pie zometers Cidentif ie-d as P-413 through P-420 on Figure 3) will

be located around the southern and eastern fringes of the study area These piezometers are intended solely to provide data on groundwater flow patterns including both regional flow trends

I 9

I GL I

I I and the possible localized hydraulic effects of the Canada and

Maple Street sewer lines

I Monitomiddotring wells will be installed in accordance with procedures

I outlined in sections 420 and 430 of the Phase One Sampling Plan and the relevarit GZA SOPs (SOPs 111 112 and 21) An exception to the specified procedures will entail the use of hollow stern augers for the shallow wells as described in Section 35-0 of Deliverable 3

I Piezometers will be i_nstalled in accordance with GZA SOP 21 in bor~holes advanced by hollow stem augec techniques where possible The proposed pie~orneter locations are in portions of the study

I area where contamination related to the Silresirn site is n-0t

I anticipated at the shallow depths involved Consequently piezoshyrneter drilling and installation techniques will differ from monitoring well procedures in the following points

I a Drillirig equipment will not be decontaminated between

borings unless obvious evidence of contamination ( in the form of elevated screening results) is encountered

I b Cement-bentonite grout above bentonite seals will be omitted

for shallow rnoni tor ing wells

I c In areas where drill rig access is difficult (eg P-417 and

P-418) borings may be advanced by hand augers and piezoshyrneters may consist of galvanized steel well points hand driven into the shallow aquifer

I 350 GROUNDWATER SAMPLING AND ANALYSES

I I

Upon completion of the Phase Two well installation program previously existing Phase One and Phase Two monitoring wells will be sampled for field testing (pH specific conductance and dissolved oxygen) and voe screening Up to 4 0 rnoni tor ing points will also be analyzed for HSL voes plus tetrahydrofuran dimethyl sulfide and trichlorofluorornethane via EPA Method 624 In addition six locations will be selected for full spectrum HSL analysis Selection of specific monitoring points for voe and

I HSL testing will be made upon completion of the Phase Two well

I installation and groundwater screening program Water quality samples will be collemiddotcted only from those shallow piezometers where field screening of groundwater indicates signif icant levels of voes (ie bulldetectable levels of individual volatiles based on Ge screening datagt bull

I I

10

I CL I

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I 3 3middot0 CHARACTERIZATION OF BURIED OBJECTS

To identify the six potentially significant buried objects a

I test pit pr og ram w i 11 be conducted by G Z A bull Test pits w i 11 be excavated through the clay cap at the locations of BOs 1 4 5 6 8 and 9 on Figure 2 Test pits will be excavated by a contracted backhoe and will be observed and loggmiddoted by a GZA geologist or engineer Each test pit will extend to the depth of the buried object ipound encountered or the the maximum reach of the backhoe (at least 12 feet) GZA personnel will attempt to visually identify and characterize any buried objects encountershyed

I _

I I

Initially clay and gravel fill associated with the cap construcshytion will be excavated at each test pit location These materials will be segregated adjacent to the excavatiori Each test pit will then be excavated to the required depth with excavated soils placed on a polyethylene liner and covered with polyethylene sheeting Upon completion of the test pits contaminated soils will be replaced in the excavations The backhoe will then be decontaminated by hot water power rinsing or

I steam cleaning Clean granular and clay fills will then be replaced at the top of the excavation and compacted with the backhoe bucket Efforts wi 11 be made to restore the cap to its original condition upon completion of the test pit program

1 During the test pit excavations GZA will screen soil samples collected atl- to 2-foot intervals using an H-Nu Model PI-101 Results of the screening will be transmitted to the US EPAs representative on-site It is GZAs understanding ~hat EPA will

I then select locations for soil samples for HSL analysis based on

I screening results and visual observations GZA personnel will collect the samples from the test pit walls or backhoe bucket using a stainless steel soil trowel in bottles provided by the Roy F Weston Laboratory Sample containers will then be provided to the EPA~s representative on-site

I Where feasible attempts will be made to sample the contents of any intact containers encountered However close observation or sampling of possible waste containers may be limited by health

I and saf~ty considerations Samples collected will be primarily

I for visual characterization or voe screening~ no significant chemical testing program for the test pit excavations is presentshyly proposed Tanks or drums if encountered will not be removed from the excavations but will be clearly marked for future referencmiddote GZA will log soil conditions stratigraphy ground-

I I

8

I G1 I

I I water levels and descriptions of buried objects encountered

during the explorations

Health and safety considerations will be dictated by the site Health and Safety Plan CPOP-315) It is anticipated that excavation work will begin in modified level C personnel protecshytion with provisions to upgrade to levels C and B

340 PHASE TWO WELL INSTALLATIONS

For the Phase Two groundwater investigation twelve additional monitoring wells are proposed These new monitoring wells will be supplemented by the installation of eight piezometers designed to provide groundwater elevation dmiddotata in the shallow aquifer to aid in model development The locations of proposed wells and piezometers are presented on Figure 3

Wells 401 402 and 403 are planned to evaluate the southern and eastern extent of contaminant migration and to provide data on piezometric head distribution These wells will be advanced until a minimum of 10 feet of uncontaminated material has been encountered below the water table Wells 404 405 406 and 412 will be shallow wells aimed at delineating the extent of ohserved mounding below the site refining the characterization of contaminant distribution on-site and evaluating potential source areas

I Wells 407 and 408 will be multi-level wells on either sidmiddote of the

1

Tanner Street branch sewer~- both installations will include a shallow wellscreen spanning the water table at the level of the sewer line and a deep screen set at approximately 3 0 feet dependshying upon subs-urf ace conditions encountered Well 409 will be a multi-level installation on the north side of the main sewer line with wellscreens set at depths eguivalent to those -ofmiddot well MW-315 middot (15 feet and 30 feet) In addition deep piezometers set above rock but below the sewer invert will be installed at wells 315 and 409

At locations 41middot0 and 411 drilling will advance until at least 10 feet of uncontaminated material has been encountered based on field screening results Either a shallow well or multi-level installatimiddoton will be employed at each location depending upon subsurface conditions encountered

I I Pie zometers Cidentif ie-d as P-413 through P-420 on Figure 3) will

be located around the southern and eastern fringes of the study area These piezometers are intended solely to provide data on groundwater flow patterns including both regional flow trends

I 9

I GL I

I I and the possible localized hydraulic effects of the Canada and

Maple Street sewer lines

I Monitomiddotring wells will be installed in accordance with procedures

I outlined in sections 420 and 430 of the Phase One Sampling Plan and the relevarit GZA SOPs (SOPs 111 112 and 21) An exception to the specified procedures will entail the use of hollow stern augers for the shallow wells as described in Section 35-0 of Deliverable 3

I Piezometers will be i_nstalled in accordance with GZA SOP 21 in bor~holes advanced by hollow stem augec techniques where possible The proposed pie~orneter locations are in portions of the study

I area where contamination related to the Silresirn site is n-0t

I anticipated at the shallow depths involved Consequently piezoshyrneter drilling and installation techniques will differ from monitoring well procedures in the following points

I a Drillirig equipment will not be decontaminated between

borings unless obvious evidence of contamination ( in the form of elevated screening results) is encountered

I b Cement-bentonite grout above bentonite seals will be omitted

for shallow rnoni tor ing wells

I c In areas where drill rig access is difficult (eg P-417 and

P-418) borings may be advanced by hand augers and piezoshyrneters may consist of galvanized steel well points hand driven into the shallow aquifer

I 350 GROUNDWATER SAMPLING AND ANALYSES

I I

Upon completion of the Phase Two well installation program previously existing Phase One and Phase Two monitoring wells will be sampled for field testing (pH specific conductance and dissolved oxygen) and voe screening Up to 4 0 rnoni tor ing points will also be analyzed for HSL voes plus tetrahydrofuran dimethyl sulfide and trichlorofluorornethane via EPA Method 624 In addition six locations will be selected for full spectrum HSL analysis Selection of specific monitoring points for voe and

I HSL testing will be made upon completion of the Phase Two well

I installation and groundwater screening program Water quality samples will be collemiddotcted only from those shallow piezometers where field screening of groundwater indicates signif icant levels of voes (ie bulldetectable levels of individual volatiles based on Ge screening datagt bull

I I

10

I CL I

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I water levels and descriptions of buried objects encountered

during the explorations

Health and safety considerations will be dictated by the site Health and Safety Plan CPOP-315) It is anticipated that excavation work will begin in modified level C personnel protecshytion with provisions to upgrade to levels C and B

340 PHASE TWO WELL INSTALLATIONS

For the Phase Two groundwater investigation twelve additional monitoring wells are proposed These new monitoring wells will be supplemented by the installation of eight piezometers designed to provide groundwater elevation dmiddotata in the shallow aquifer to aid in model development The locations of proposed wells and piezometers are presented on Figure 3

Wells 401 402 and 403 are planned to evaluate the southern and eastern extent of contaminant migration and to provide data on piezometric head distribution These wells will be advanced until a minimum of 10 feet of uncontaminated material has been encountered below the water table Wells 404 405 406 and 412 will be shallow wells aimed at delineating the extent of ohserved mounding below the site refining the characterization of contaminant distribution on-site and evaluating potential source areas

I Wells 407 and 408 will be multi-level wells on either sidmiddote of the

1

Tanner Street branch sewer~- both installations will include a shallow wellscreen spanning the water table at the level of the sewer line and a deep screen set at approximately 3 0 feet dependshying upon subs-urf ace conditions encountered Well 409 will be a multi-level installation on the north side of the main sewer line with wellscreens set at depths eguivalent to those -ofmiddot well MW-315 middot (15 feet and 30 feet) In addition deep piezometers set above rock but below the sewer invert will be installed at wells 315 and 409

At locations 41middot0 and 411 drilling will advance until at least 10 feet of uncontaminated material has been encountered based on field screening results Either a shallow well or multi-level installatimiddoton will be employed at each location depending upon subsurface conditions encountered

I I Pie zometers Cidentif ie-d as P-413 through P-420 on Figure 3) will

be located around the southern and eastern fringes of the study area These piezometers are intended solely to provide data on groundwater flow patterns including both regional flow trends

I 9

I GL I

I I and the possible localized hydraulic effects of the Canada and

Maple Street sewer lines

I Monitomiddotring wells will be installed in accordance with procedures

I outlined in sections 420 and 430 of the Phase One Sampling Plan and the relevarit GZA SOPs (SOPs 111 112 and 21) An exception to the specified procedures will entail the use of hollow stern augers for the shallow wells as described in Section 35-0 of Deliverable 3

I Piezometers will be i_nstalled in accordance with GZA SOP 21 in bor~holes advanced by hollow stem augec techniques where possible The proposed pie~orneter locations are in portions of the study

I area where contamination related to the Silresirn site is n-0t

I anticipated at the shallow depths involved Consequently piezoshyrneter drilling and installation techniques will differ from monitoring well procedures in the following points

I a Drillirig equipment will not be decontaminated between

borings unless obvious evidence of contamination ( in the form of elevated screening results) is encountered

I b Cement-bentonite grout above bentonite seals will be omitted

for shallow rnoni tor ing wells

I c In areas where drill rig access is difficult (eg P-417 and

P-418) borings may be advanced by hand augers and piezoshyrneters may consist of galvanized steel well points hand driven into the shallow aquifer

I 350 GROUNDWATER SAMPLING AND ANALYSES

I I

Upon completion of the Phase Two well installation program previously existing Phase One and Phase Two monitoring wells will be sampled for field testing (pH specific conductance and dissolved oxygen) and voe screening Up to 4 0 rnoni tor ing points will also be analyzed for HSL voes plus tetrahydrofuran dimethyl sulfide and trichlorofluorornethane via EPA Method 624 In addition six locations will be selected for full spectrum HSL analysis Selection of specific monitoring points for voe and

I HSL testing will be made upon completion of the Phase Two well

I installation and groundwater screening program Water quality samples will be collemiddotcted only from those shallow piezometers where field screening of groundwater indicates signif icant levels of voes (ie bulldetectable levels of individual volatiles based on Ge screening datagt bull

I I

10

I CL I

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I and the possible localized hydraulic effects of the Canada and

Maple Street sewer lines

I Monitomiddotring wells will be installed in accordance with procedures

I outlined in sections 420 and 430 of the Phase One Sampling Plan and the relevarit GZA SOPs (SOPs 111 112 and 21) An exception to the specified procedures will entail the use of hollow stern augers for the shallow wells as described in Section 35-0 of Deliverable 3

I Piezometers will be i_nstalled in accordance with GZA SOP 21 in bor~holes advanced by hollow stem augec techniques where possible The proposed pie~orneter locations are in portions of the study

I area where contamination related to the Silresirn site is n-0t

I anticipated at the shallow depths involved Consequently piezoshyrneter drilling and installation techniques will differ from monitoring well procedures in the following points

I a Drillirig equipment will not be decontaminated between

borings unless obvious evidence of contamination ( in the form of elevated screening results) is encountered

I b Cement-bentonite grout above bentonite seals will be omitted

for shallow rnoni tor ing wells

I c In areas where drill rig access is difficult (eg P-417 and

P-418) borings may be advanced by hand augers and piezoshyrneters may consist of galvanized steel well points hand driven into the shallow aquifer

I 350 GROUNDWATER SAMPLING AND ANALYSES

I I

Upon completion of the Phase Two well installation program previously existing Phase One and Phase Two monitoring wells will be sampled for field testing (pH specific conductance and dissolved oxygen) and voe screening Up to 4 0 rnoni tor ing points will also be analyzed for HSL voes plus tetrahydrofuran dimethyl sulfide and trichlorofluorornethane via EPA Method 624 In addition six locations will be selected for full spectrum HSL analysis Selection of specific monitoring points for voe and

I HSL testing will be made upon completion of the Phase Two well

I installation and groundwater screening program Water quality samples will be collemiddotcted only from those shallow piezometers where field screening of groundwater indicates signif icant levels of voes (ie bulldetectable levels of individual volatiles based on Ge screening datagt bull

I I

10

I CL I

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I It is noted that the proposed plan differs somewhat from the

approach originally outlined in the CDM work plan The work plan calls for analysis of at least ten wells for priority pollutants

I and testing of the remaining wells for volatile priority pollutshy

I ants and other chemical pollutants that have been detected in studies of the Silresim site GZAs review of available data from the present study and previous studies (as summarized in

I section 242) indicates that voes are clearly the primary contaminants in groundwater at the site~ consequently the proposed voe screening should provide a reliable indication of the relative levels of contamination

Criteria for selection of wells for GCMS voe or HSL analyses

I will include the following

a Available data from previous analyses

I b Hydrogeologic factors (groundwater flow directions and rates etc)

I c Preliminary voe screening results on soil and groundwater samples

I d Locations of potential receptors

I For example HSL analyses were conducted on wells MW-101B MW-102A MW-102B MW-lOSA and MW-105B in December 1985 and April 1983 Given the slow rate of groundwater flow at the site it is highly unlikely that significant changes in water quality will

1 have occur red s i n c e t he 1 a st s amp l i n g r o u n d bull Thu s these locations will not be resampled for HSL or GeMS voe analyses

I I

The presence of hydraulic barriers (sewer lines River Meadow Brook etc) and the rate and direction of groundwater flow will also be considered in selecting locations for analysis For example mosmiddott wells north and west of the Tanner Street and 84-inch sewer line will not be tested for HSL parameters Some specific wells which GZA proposes to eliminate from comprehensive analysebullS include MW-204A MW-204B MW-318 MW-314 MW-313 and MW-312 The actual list of wells to be analyzed for HSL and

I GeMS voe pmiddotarameters wi 11 be finalized upon completion of the Phase Two well installations and submitted for EPA review at that time

I I I

11

I CiL~

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I 360 SEWER LINE STUDY

A study of the sewer lines which surround the Silresim site will

I be completed as an additional element of the RI beyond the scope of the CDM work plan The details of the proposed study are outlined in the following sections

I 3 61 Background

I The City of Lowell operates a sewer system which is used for the collection and transmission of sanitary wastewater as well as

I stormwater The management of these waters together designate the system as a combined system The Lowell sewer system plan shows the site as located in District 20 The collection sewer for District 20 is a lar~e sewer through which flows move west to

I east through Lowell towards the Concord River This sewer is

noted on Lowell plans as a 72-inch diameter line which Cllanges to an 84-inch line at Tanner Street then traversing property north of the Silresim site occupied by Lowell Iron amp Steel andor Scannell Boiler Works It is not known if the 7284-inch sewer

I is circular or oval The streets around the site generally are serviced by sewer lines which eventually discharge to the 84-inch sewer

I I The City of Lowell conducted an infiltrationinflow CII)

study of the sewer system in 1977 A preliminary review of the II report indicates that flow measurements were taken in the 72-inch 84-inch and Tanner Street sewers While the specific results of these measurements are not presented in the II report the aggregate estimate of the infiltration for District

I 20 is provided

I Several lengths of sewer are of interest to this proposed

investigation These sewers are

I bull Tanner Street (45x30-inch) Canada Street to its

confluence with the 84-inch sewer bull Canada Street (15-inch) Main Street to Tanner Street bull 84-inch sewer Tanner Street approximately 600 feet east

and northeast to a manhole located west of the rail spur

I which parallels the eastern boundary of the site and bull Maple Street (48x32-ineh) Autumn Street to a manhole

west of Gorham Street

12

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I I I I I I I I I I I I I I I middot1 I 1middot I GZ

3 6 2 Scope of Work

Initial Sample Collection

Representatives of Roy F Weston Inc have conducted initial sampling by collecting split samples of sewage with Kassachusetts DEQE and their contractor Wehran Engineering during the early morning of June 27 1986 Results from these samples are presented in Appendix A Sample locations are shown on Figure 3

Background Data Collection and Review

The Lowell City Engineer will be contacted to discuss review and obtain information regarding the known quantities of infiltration in District 20 In addition available drawings and other information will be used to select flow measurement points and will provide insight as to the hydraulics of the system so that field measurements and observations can be correlated with the system design

System Inspection

A preliminary inspection of certain manholes in the site area was performed on June 25 1986 This initial inspecshytion provided a visual interpretation of the systems condition and allowed equipment needs to be identified and acce 9 s and egress points identified

Additional inspections are proposed using a camera whereby a video tape will be made of a length of sewer The televising method will be done for C]J--the lower section of the Tanner Street sewer approximately from Cambridge Street to its confluence with the 84-inch sewer and (2) the 84-inch sewer from Tanner Street to MH-6 (see attached Figure 3) The televising of the Tanner Street sewer wi11 be accomplished by floating a camera in the sewage flow while controlling its movement using cables The 84-inch sewer will be televised by having an individual walk through the sewer line rotating a camera so that the entire circumference of the sewer can be viewed A television screen will be set-up on the surface to allow that the sewer be viewed during the process so that areas of interest can be thoroughly reviewed Amiddot video-type tape will be produced from which free zed pictures can be developed The television records will be used to determine the presence and location if any of visually discernible infiltration

13

0

I

I I I I I I I I I I _I

I _I

Real-time monitoiring for hydrogen sulfide oxygen explosive and combustible gases and toxics will be conducted prior to televising the 84-inch sewer The results of this monitoring will be utilized to determine the breathing zone conditions in the sewer It is planned in this proposal that utilizing a fan system which will continuously supply air to the sewer breathing zone conditions will be amenable to Level D personal protection

Flow Measurement and Sewage Sampling Analysis

A record of sewage flow will be obtained at one or two manholes which access the 84-inch sewer ~utomated ultrasonic-middot type flow depth measuring equipment will be installed to determine the fluctuation in the sewage flow and define the base flow condition This is important to the 84-inch sewer in that it has a large service area and may lag significantly behind the ordinary base flow period for sewers The record of data is proposed to be seven days~

To quantitatively assess groundwater infiltration in the sewers of interest instantaneous flow measurements will be made at approximately 2 00 AM and 5 00 AM during one morning at the following locations

Tanner Street

middot upgradient of Canada Street bull downgradient of Canada Street middot south--of Cambridge Street ( MH-0) bull upgiadient of the confluence with the 84-inch sewer

(MH-2)

84-Inch

middot upstream of confluence the with the Tanner Street sewer

bull at the manhole west of the rail spur (MH-15)

Samp]e5 of the wastewater water present in the sewer will be collected during the flow measurement activities Samples will be collected at the following locations

Tanner Street (South Branch)

bull downstream of Canada Street and middotconfluencewith 84-inch sewer (MH-2) bull south of Cambridge Street (MH-0)

14

I GZ ~ -

I I Tanner Street (North Branch)

I middot upstream of confluence with 84 sewer

78-84-Inch

middot upstream of confluence with 45x30-inch Tanner Street sewer line and

bull manhole west of rail spur (MH-6)

1 The upstream sample for the 78-S4-inch sewer line was

collected during the initial sampling at a manhole located on Washington Street west of River Meadow Brook It is our undershystanding that a flow measurement and a representative sample can

I be obtained from the 78-84-inch sewer line at this sewers intersection with the 45x30-inch sewer in Tanner Street An attempt will be made to measure flow and collect the upstream

I sample from the 78-84-inch sewer at this location as it is believed that it will focus the investigation of infiltration to the site area

The samples will be screened for voes selected replicates will be submitted for laboratory analysis by EPA

I Method 624 The voes will be used as the indicator of

I I

groundwater infiltration from the site or other potential sources and upgradient samples will be used to depoundine the background concentration of these compounds in the Lowell sewage The wastewater samples will also be analyzed for total suspended soils to determine the comparability of samples In addition a sample will be collected downstream of the site in the 84-inch sewer which will be submitted for Hazardous Substance List (HSL)organics analyses

I I I

15

I I 370 VENT MONITORING

An underground system of porous PVC pipes which are vented to the

I ambient air via vertical risers is presently in place below the

I clay cap at the Silresim site The ventilation system consists of five individual multi branched networks of lateral underground pipes with each network having two vertical air vents

I At the present time contaminant emissions from the air vents are not well characterized and consequently it is not possible to determine the potential risk to local receptors posed by these emissions The purposes of the undertaking outlined herein are to identify and measure the concentration of volatile organic

I compounds (VOCs) in calculate emission these data will be

I estimate the risk to

the air within the ventilation system and rates of voes to ambient air Ultimately used in an appropriate dispersion model to nearby receptors posed by voe emissions

Technical Approach

I Concentrations of voes in the vent system air will be measured by using a standard NIOSH approved air sampling technishy

I que in which air-sampling pumps are used to draw known volumesmiddot of air through sorbent air-sample tubes containing activated

I charcoal Volatile organic contaminants in the air are trapped or adsorbed onto the surpoundace of the activated charcoal which is later analyzed in the laboratory for the identities and amounts of adsorbed contaminants The amount of each contaminant is then divided by the total volume of air drawn through the

I sample tube to give the concentration of each cmiddotontaminant in the vent air in uni ts of micrograms per liter (ug1)

In addition to air concentrations of contaminants it is

I necessary to measure total air flow from the vents to calculate

Ii the rate of contaminant emission To do this a soap-bubble flow meter will be connected to the vent networks after having sealed the openings of the air vents~ Air flow will thus be measured in units of liters per minute CLmin)

Contaminant emission rates will then be calculated by

I multiplying air concentration of contaminants times air flow For example air concentration of contaminant in ug1 times air flow in Lmin = contaminant emission rate in ugmin

I In t he prop o s e d method o 1 o g y s amp 1 i n g e f f or t s wi 11 be directed toward the

I selected compounds compounds is based

I I

detection and quantification of twenty-one (see Table 4) The selection of these target on previous identification of contaminants

16

I GZ

I I present at the Silresim site using gas chromatographymass spectshy

rometry techniques

I In the following section~ sampling techniques analysis and related procedures are described in detail

I Materials and Methods

1 Screening of Vents with H-Nu

I For the purpose of selecting vents for air sampling an

I B-Nu Model PI-101 photoionizer will be used to screen for total volatile organic compound (VOC) levels within each vent There are five ventilation networks at the

1 middot site each with two aboveground vents The one vent of

two in each network having the highest total volatile organic concentration will be selected for air sampling

1 Thus a total of five vents will be selected for samplshy

I ing Concentrations of voes as indicated by the H-Nu will be recorded

2 Air Sampling

1 Emissions at each of the five vents will be sampled

using SKC charcoal sorbent tubes containing 1000 milligrams of activated charcoal Samples will be collected using Gillian air sampling pumps equipped

I with low-flow devices and precalibrated at a flow of approximately 50 ccminute Laboratory calibration of pumps w i 11 be a ccomp 1 i shed us ing a soap bubb 1 e f 1 ow meter which will also be used to check pump flow in

I I

the field both at the beginning and at the end of each sampling period In the vent with the highest emission levels as indicated by prior H-Nu readings two charcoal tubes in series (tandem) will be used whereas in the remaining four vents single tubes will be used In the vent with the smiddotecond highest emission level a duplicate (parallel) sample on a single

1000 mg charcoal tube will be obtained to verify analytical results

t Each sample will be taken for a duration of four hours with a flow rate of 50 ccmin thereby yielding a sample volume (for each sample) of 12 liters

I Both vents in each system will be blocked while the sample is being taken from within the vent

I 17

I GZ I

I I 3 Measuring Vent Flow Rates

I Gaseous flow from each vent where air sampling is conducted will be measured using a soap bubble flow

I meter In each vent network both aboveground vents will be blocked with inflated balloons A sampling port will be drilled in the side of each vent to be measured and it will be fitted with an air-tight

I connection to the soap bubble flow meter All five vents where air sampling is conducted will be measured for gaseous flow rate prior to air sampling and then

(I again after air sampling is completed The average of these two values for each of five vents will be used to calculate the emission rate for that vent

4 Recording of Climatic Conditions

1 Barometric pressure will be obtained by contacting the US Weather Service~ during the sampling period data will be obtained from the nearest monitoring station

I Air temperature will be measured on-site with a thermoshymeter every thirty minutes during sampling These data wi 11 be u se d to co r rec t s a mp 1 i n g d at a to st and a rd conditions

I)

5 bull Chemical Analysis of Samples

Samples will be analyzed using NIOSH Analytical Method1 I

No PampC 237 which utili~es carbon disulfide as the desorbent and a gas chromatograph equipped with a flame ionization detector For the 1000 mg charcoal tubes which will be used the average detection limit for the compounds being analyzed is approximately

I 30 ugtube A 12-liter sample volume will yield the following minimum detectable airborne concentrations for benzene toluene and xylenes

I Benzene 75 ppm Toluene 60 ppm Xylene 60 ppm

I A~cording to the National rnstitute of Occupational Safety and Health (N10SH) activated charcoal is the preferred adsorbent and carbon disulfide is the preferred desorbent for the compounds identified at Silresim with the exception of 2-butanone or methyl

I ethyl ketone (MEK) However charcoal is listed as an alternative adsorbent for MEK sampling The preferred

I 18

I G1

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I Tanner Street (North Branch)

I middot upstream of confluence with 84 sewer

78-84-Inch

middot upstream of confluence with 45x30-inch Tanner Street sewer line and

bull manhole west of rail spur (MH-6)

1 The upstream sample for the 78-S4-inch sewer line was

collected during the initial sampling at a manhole located on Washington Street west of River Meadow Brook It is our undershystanding that a flow measurement and a representative sample can

I be obtained from the 78-84-inch sewer line at this sewers intersection with the 45x30-inch sewer in Tanner Street An attempt will be made to measure flow and collect the upstream

I sample from the 78-84-inch sewer at this location as it is believed that it will focus the investigation of infiltration to the site area

The samples will be screened for voes selected replicates will be submitted for laboratory analysis by EPA

I Method 624 The voes will be used as the indicator of

I I

groundwater infiltration from the site or other potential sources and upgradient samples will be used to depoundine the background concentration of these compounds in the Lowell sewage The wastewater samples will also be analyzed for total suspended soils to determine the comparability of samples In addition a sample will be collected downstream of the site in the 84-inch sewer which will be submitted for Hazardous Substance List (HSL)organics analyses

I I I

15

I I 370 VENT MONITORING

An underground system of porous PVC pipes which are vented to the

I ambient air via vertical risers is presently in place below the

I clay cap at the Silresim site The ventilation system consists of five individual multi branched networks of lateral underground pipes with each network having two vertical air vents

I At the present time contaminant emissions from the air vents are not well characterized and consequently it is not possible to determine the potential risk to local receptors posed by these emissions The purposes of the undertaking outlined herein are to identify and measure the concentration of volatile organic

I compounds (VOCs) in calculate emission these data will be

I estimate the risk to

the air within the ventilation system and rates of voes to ambient air Ultimately used in an appropriate dispersion model to nearby receptors posed by voe emissions

Technical Approach

I Concentrations of voes in the vent system air will be measured by using a standard NIOSH approved air sampling technishy

I que in which air-sampling pumps are used to draw known volumesmiddot of air through sorbent air-sample tubes containing activated

I charcoal Volatile organic contaminants in the air are trapped or adsorbed onto the surpoundace of the activated charcoal which is later analyzed in the laboratory for the identities and amounts of adsorbed contaminants The amount of each contaminant is then divided by the total volume of air drawn through the

I sample tube to give the concentration of each cmiddotontaminant in the vent air in uni ts of micrograms per liter (ug1)

In addition to air concentrations of contaminants it is

I necessary to measure total air flow from the vents to calculate

Ii the rate of contaminant emission To do this a soap-bubble flow meter will be connected to the vent networks after having sealed the openings of the air vents~ Air flow will thus be measured in units of liters per minute CLmin)

Contaminant emission rates will then be calculated by

I multiplying air concentration of contaminants times air flow For example air concentration of contaminant in ug1 times air flow in Lmin = contaminant emission rate in ugmin

I In t he prop o s e d method o 1 o g y s amp 1 i n g e f f or t s wi 11 be directed toward the

I selected compounds compounds is based

I I

detection and quantification of twenty-one (see Table 4) The selection of these target on previous identification of contaminants

16

I GZ

I I present at the Silresim site using gas chromatographymass spectshy

rometry techniques

I In the following section~ sampling techniques analysis and related procedures are described in detail

I Materials and Methods

1 Screening of Vents with H-Nu

I For the purpose of selecting vents for air sampling an

I B-Nu Model PI-101 photoionizer will be used to screen for total volatile organic compound (VOC) levels within each vent There are five ventilation networks at the

1 middot site each with two aboveground vents The one vent of

two in each network having the highest total volatile organic concentration will be selected for air sampling

1 Thus a total of five vents will be selected for samplshy

I ing Concentrations of voes as indicated by the H-Nu will be recorded

2 Air Sampling

1 Emissions at each of the five vents will be sampled

using SKC charcoal sorbent tubes containing 1000 milligrams of activated charcoal Samples will be collected using Gillian air sampling pumps equipped

I with low-flow devices and precalibrated at a flow of approximately 50 ccminute Laboratory calibration of pumps w i 11 be a ccomp 1 i shed us ing a soap bubb 1 e f 1 ow meter which will also be used to check pump flow in

I I

the field both at the beginning and at the end of each sampling period In the vent with the highest emission levels as indicated by prior H-Nu readings two charcoal tubes in series (tandem) will be used whereas in the remaining four vents single tubes will be used In the vent with the smiddotecond highest emission level a duplicate (parallel) sample on a single

1000 mg charcoal tube will be obtained to verify analytical results

t Each sample will be taken for a duration of four hours with a flow rate of 50 ccmin thereby yielding a sample volume (for each sample) of 12 liters

I Both vents in each system will be blocked while the sample is being taken from within the vent

I 17

I GZ I

I I 3 Measuring Vent Flow Rates

I Gaseous flow from each vent where air sampling is conducted will be measured using a soap bubble flow

I meter In each vent network both aboveground vents will be blocked with inflated balloons A sampling port will be drilled in the side of each vent to be measured and it will be fitted with an air-tight

I connection to the soap bubble flow meter All five vents where air sampling is conducted will be measured for gaseous flow rate prior to air sampling and then

(I again after air sampling is completed The average of these two values for each of five vents will be used to calculate the emission rate for that vent

4 Recording of Climatic Conditions

1 Barometric pressure will be obtained by contacting the US Weather Service~ during the sampling period data will be obtained from the nearest monitoring station

I Air temperature will be measured on-site with a thermoshymeter every thirty minutes during sampling These data wi 11 be u se d to co r rec t s a mp 1 i n g d at a to st and a rd conditions

I)

5 bull Chemical Analysis of Samples

Samples will be analyzed using NIOSH Analytical Method1 I

No PampC 237 which utili~es carbon disulfide as the desorbent and a gas chromatograph equipped with a flame ionization detector For the 1000 mg charcoal tubes which will be used the average detection limit for the compounds being analyzed is approximately

I 30 ugtube A 12-liter sample volume will yield the following minimum detectable airborne concentrations for benzene toluene and xylenes

I Benzene 75 ppm Toluene 60 ppm Xylene 60 ppm

I A~cording to the National rnstitute of Occupational Safety and Health (N10SH) activated charcoal is the preferred adsorbent and carbon disulfide is the preferred desorbent for the compounds identified at Silresim with the exception of 2-butanone or methyl

I ethyl ketone (MEK) However charcoal is listed as an alternative adsorbent for MEK sampling The preferred

I 18

I G1

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I 370 VENT MONITORING

An underground system of porous PVC pipes which are vented to the

I ambient air via vertical risers is presently in place below the

I clay cap at the Silresim site The ventilation system consists of five individual multi branched networks of lateral underground pipes with each network having two vertical air vents

I At the present time contaminant emissions from the air vents are not well characterized and consequently it is not possible to determine the potential risk to local receptors posed by these emissions The purposes of the undertaking outlined herein are to identify and measure the concentration of volatile organic

I compounds (VOCs) in calculate emission these data will be

I estimate the risk to

the air within the ventilation system and rates of voes to ambient air Ultimately used in an appropriate dispersion model to nearby receptors posed by voe emissions

Technical Approach

I Concentrations of voes in the vent system air will be measured by using a standard NIOSH approved air sampling technishy

I que in which air-sampling pumps are used to draw known volumesmiddot of air through sorbent air-sample tubes containing activated

I charcoal Volatile organic contaminants in the air are trapped or adsorbed onto the surpoundace of the activated charcoal which is later analyzed in the laboratory for the identities and amounts of adsorbed contaminants The amount of each contaminant is then divided by the total volume of air drawn through the

I sample tube to give the concentration of each cmiddotontaminant in the vent air in uni ts of micrograms per liter (ug1)

In addition to air concentrations of contaminants it is

I necessary to measure total air flow from the vents to calculate

Ii the rate of contaminant emission To do this a soap-bubble flow meter will be connected to the vent networks after having sealed the openings of the air vents~ Air flow will thus be measured in units of liters per minute CLmin)

Contaminant emission rates will then be calculated by

I multiplying air concentration of contaminants times air flow For example air concentration of contaminant in ug1 times air flow in Lmin = contaminant emission rate in ugmin

I In t he prop o s e d method o 1 o g y s amp 1 i n g e f f or t s wi 11 be directed toward the

I selected compounds compounds is based

I I

detection and quantification of twenty-one (see Table 4) The selection of these target on previous identification of contaminants

16

I GZ

I I present at the Silresim site using gas chromatographymass spectshy

rometry techniques

I In the following section~ sampling techniques analysis and related procedures are described in detail

I Materials and Methods

1 Screening of Vents with H-Nu

I For the purpose of selecting vents for air sampling an

I B-Nu Model PI-101 photoionizer will be used to screen for total volatile organic compound (VOC) levels within each vent There are five ventilation networks at the

1 middot site each with two aboveground vents The one vent of

two in each network having the highest total volatile organic concentration will be selected for air sampling

1 Thus a total of five vents will be selected for samplshy

I ing Concentrations of voes as indicated by the H-Nu will be recorded

2 Air Sampling

1 Emissions at each of the five vents will be sampled

using SKC charcoal sorbent tubes containing 1000 milligrams of activated charcoal Samples will be collected using Gillian air sampling pumps equipped

I with low-flow devices and precalibrated at a flow of approximately 50 ccminute Laboratory calibration of pumps w i 11 be a ccomp 1 i shed us ing a soap bubb 1 e f 1 ow meter which will also be used to check pump flow in

I I

the field both at the beginning and at the end of each sampling period In the vent with the highest emission levels as indicated by prior H-Nu readings two charcoal tubes in series (tandem) will be used whereas in the remaining four vents single tubes will be used In the vent with the smiddotecond highest emission level a duplicate (parallel) sample on a single

1000 mg charcoal tube will be obtained to verify analytical results

t Each sample will be taken for a duration of four hours with a flow rate of 50 ccmin thereby yielding a sample volume (for each sample) of 12 liters

I Both vents in each system will be blocked while the sample is being taken from within the vent

I 17

I GZ I

I I 3 Measuring Vent Flow Rates

I Gaseous flow from each vent where air sampling is conducted will be measured using a soap bubble flow

I meter In each vent network both aboveground vents will be blocked with inflated balloons A sampling port will be drilled in the side of each vent to be measured and it will be fitted with an air-tight

I connection to the soap bubble flow meter All five vents where air sampling is conducted will be measured for gaseous flow rate prior to air sampling and then

(I again after air sampling is completed The average of these two values for each of five vents will be used to calculate the emission rate for that vent

4 Recording of Climatic Conditions

1 Barometric pressure will be obtained by contacting the US Weather Service~ during the sampling period data will be obtained from the nearest monitoring station

I Air temperature will be measured on-site with a thermoshymeter every thirty minutes during sampling These data wi 11 be u se d to co r rec t s a mp 1 i n g d at a to st and a rd conditions

I)

5 bull Chemical Analysis of Samples

Samples will be analyzed using NIOSH Analytical Method1 I

No PampC 237 which utili~es carbon disulfide as the desorbent and a gas chromatograph equipped with a flame ionization detector For the 1000 mg charcoal tubes which will be used the average detection limit for the compounds being analyzed is approximately

I 30 ugtube A 12-liter sample volume will yield the following minimum detectable airborne concentrations for benzene toluene and xylenes

I Benzene 75 ppm Toluene 60 ppm Xylene 60 ppm

I A~cording to the National rnstitute of Occupational Safety and Health (N10SH) activated charcoal is the preferred adsorbent and carbon disulfide is the preferred desorbent for the compounds identified at Silresim with the exception of 2-butanone or methyl

I ethyl ketone (MEK) However charcoal is listed as an alternative adsorbent for MEK sampling The preferred

I 18

I G1

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I present at the Silresim site using gas chromatographymass spectshy

rometry techniques

I In the following section~ sampling techniques analysis and related procedures are described in detail

I Materials and Methods

1 Screening of Vents with H-Nu

I For the purpose of selecting vents for air sampling an

I B-Nu Model PI-101 photoionizer will be used to screen for total volatile organic compound (VOC) levels within each vent There are five ventilation networks at the

1 middot site each with two aboveground vents The one vent of

two in each network having the highest total volatile organic concentration will be selected for air sampling

1 Thus a total of five vents will be selected for samplshy

I ing Concentrations of voes as indicated by the H-Nu will be recorded

2 Air Sampling

1 Emissions at each of the five vents will be sampled

using SKC charcoal sorbent tubes containing 1000 milligrams of activated charcoal Samples will be collected using Gillian air sampling pumps equipped

I with low-flow devices and precalibrated at a flow of approximately 50 ccminute Laboratory calibration of pumps w i 11 be a ccomp 1 i shed us ing a soap bubb 1 e f 1 ow meter which will also be used to check pump flow in

I I

the field both at the beginning and at the end of each sampling period In the vent with the highest emission levels as indicated by prior H-Nu readings two charcoal tubes in series (tandem) will be used whereas in the remaining four vents single tubes will be used In the vent with the smiddotecond highest emission level a duplicate (parallel) sample on a single

1000 mg charcoal tube will be obtained to verify analytical results

t Each sample will be taken for a duration of four hours with a flow rate of 50 ccmin thereby yielding a sample volume (for each sample) of 12 liters

I Both vents in each system will be blocked while the sample is being taken from within the vent

I 17

I GZ I

I I 3 Measuring Vent Flow Rates

I Gaseous flow from each vent where air sampling is conducted will be measured using a soap bubble flow

I meter In each vent network both aboveground vents will be blocked with inflated balloons A sampling port will be drilled in the side of each vent to be measured and it will be fitted with an air-tight

I connection to the soap bubble flow meter All five vents where air sampling is conducted will be measured for gaseous flow rate prior to air sampling and then

(I again after air sampling is completed The average of these two values for each of five vents will be used to calculate the emission rate for that vent

4 Recording of Climatic Conditions

1 Barometric pressure will be obtained by contacting the US Weather Service~ during the sampling period data will be obtained from the nearest monitoring station

I Air temperature will be measured on-site with a thermoshymeter every thirty minutes during sampling These data wi 11 be u se d to co r rec t s a mp 1 i n g d at a to st and a rd conditions

I)

5 bull Chemical Analysis of Samples

Samples will be analyzed using NIOSH Analytical Method1 I

No PampC 237 which utili~es carbon disulfide as the desorbent and a gas chromatograph equipped with a flame ionization detector For the 1000 mg charcoal tubes which will be used the average detection limit for the compounds being analyzed is approximately

I 30 ugtube A 12-liter sample volume will yield the following minimum detectable airborne concentrations for benzene toluene and xylenes

I Benzene 75 ppm Toluene 60 ppm Xylene 60 ppm

I A~cording to the National rnstitute of Occupational Safety and Health (N10SH) activated charcoal is the preferred adsorbent and carbon disulfide is the preferred desorbent for the compounds identified at Silresim with the exception of 2-butanone or methyl

I ethyl ketone (MEK) However charcoal is listed as an alternative adsorbent for MEK sampling The preferred

I 18

I G1

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I 3 Measuring Vent Flow Rates

I Gaseous flow from each vent where air sampling is conducted will be measured using a soap bubble flow

I meter In each vent network both aboveground vents will be blocked with inflated balloons A sampling port will be drilled in the side of each vent to be measured and it will be fitted with an air-tight

I connection to the soap bubble flow meter All five vents where air sampling is conducted will be measured for gaseous flow rate prior to air sampling and then

(I again after air sampling is completed The average of these two values for each of five vents will be used to calculate the emission rate for that vent

4 Recording of Climatic Conditions

1 Barometric pressure will be obtained by contacting the US Weather Service~ during the sampling period data will be obtained from the nearest monitoring station

I Air temperature will be measured on-site with a thermoshymeter every thirty minutes during sampling These data wi 11 be u se d to co r rec t s a mp 1 i n g d at a to st and a rd conditions

I)

5 bull Chemical Analysis of Samples

Samples will be analyzed using NIOSH Analytical Method1 I

No PampC 237 which utili~es carbon disulfide as the desorbent and a gas chromatograph equipped with a flame ionization detector For the 1000 mg charcoal tubes which will be used the average detection limit for the compounds being analyzed is approximately

I 30 ugtube A 12-liter sample volume will yield the following minimum detectable airborne concentrations for benzene toluene and xylenes

I Benzene 75 ppm Toluene 60 ppm Xylene 60 ppm

I A~cording to the National rnstitute of Occupational Safety and Health (N10SH) activated charcoal is the preferred adsorbent and carbon disulfide is the preferred desorbent for the compounds identified at Silresim with the exception of 2-butanone or methyl

I ethyl ketone (MEK) However charcoal is listed as an alternative adsorbent for MEK sampling The preferred

I 18

I G1

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I sorbents are given in the NIOSH Manual of Amiddotnalytical

Methods 3rd Edition 1984

I For quality control purposes in addition to the six

samples (five samples and one duplicate) submitted to the lab for analysis three blanks will be submitted a field blank a trip blank and a lab blank The field blank is opened at the site just as sample tubes are and is kept unsealed at the site until sampling is terminated Then it is sealed and sent for analysis

I 1 with regular samples A trip blank is a tube that is

opened and immediately sealed just prior to sending samples to the lab for analysis A lab b 1 arik is an unopened tube sent to the lab for analysis

6 Calculation of Contaminant Emission Rates As explained earlier air flow will be measured at each air vent where air sampling is conducted one measureshyment will be taken before air sampling and another after sampling The average 0pound these values will be multiplied times the air concentration of each contamishynant in that vent to give the contamiriant emission rate

-I from that vent The sum of the emission rates from the

ll

I five vents for each contaminant will yield the total emission rate for each contaminant from beneath the clay cap at the Silresim site

400 GROUNDWATER MODELING

410 OBJECTIVES

II

I There are three primary objectives to the current Silresim groundwater modeling effort The main objective is to improve understanding of groundwater behavior at the site by enhancing knowledge of major and minor flow directions and pathways

1 sources of rec1harge and the location and relative importance of receptors A second objective is to provide necessary groundshywater flow information so that the fate of groundwater contamishynants can be determined via analytical or numerical methods The final objective is to evaluate remedial action alternatives specifically to evaluate the way in which the various aiternashyII ti ves would af fect groundwater flow and thus contaminant transshyport and contaminant concentrations in groundwater

I Ii 19

IGZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

I I 420 NUMERICAL CODE

I The numerical code that has been selected for this modeling effort is MODFLOW (MG McDonald and AW Harbaugh USGS Reston

I VA 1984) It is a modular finite-difference groundwater model designed to simulate two or three-dimensional transient or steadyshystate fl-0w in anisotropic (or isotropic) heterogeneous (or homogeneous) aquifer systems

I 430 STUDY REGION

The study]egion that has been selected is presented in Figure 4 It encompasses a total area of about 3800 acres and extends appr~ximately 21 miles in the east-west direction and 29 miles in the north-south direction The Silresim site itself is located near the center of the region about 03 miles south of its midpoint and covers an area of approximately 5 acres I Existing m-0nitoring wells around the site define a somewhat larger focus area containing over 68 acres

I In general the modeling region contains two separate yet connected groundwater flow areas an area to the south between River Meadow Brook (on the west) and the Concord River (on the east) which contains the Silresim site and a second area to the

I north situated on the other side of a dividing till hill and connected to the southern area by the Concord River and the unconsolidated materials that lie on either side of it

Both areas appear to be composed largely of stratified outwash and alluvium deposits of varying thicknesses overlying bedrock and till and covered by a relatively shallow layer of fill In the southern region a relatively deep pre-glacial river valley appears to traverse the region resulting in unconsolidated soil

I thicknesses greater than 90 feet in the immediate Silresim site area

4 bull 40 BOUNDARIES AND SPECIAL HYDROLOGICGEOLOGIC FEATURES

The following boundary conditions have been selected and incorporated into the current groundwater model I 1 Western boundary - The western boundary is composed of a

till hill running to the west of and parallel to the River Meadow Brook (type= no-flow)

I 2 Southern boundary - The southern boundary is composed of a

till hill in the central portion flanked by areasbull where gr6undwater flow appears to be parallel to the boundary and

bull 20

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

middot1

I directed towards the adjacent intersecting rivers (type = no flow)

I 3 Eastern boundary - The eastern boundary is composed of a

I chain of till hills directly east of and parallel to the Concord River (type= no-flow)

I 4 Northern boundary - The northern boundary is dominated by a

major river system the Merrimack River which runs just south of the boundary along its entire length (type= no flow with constant head in the river)

The model includes the following special features

1

I 1 Rivers and Canals - Rivers and cinals are included as line

sources andor sinks with specified heads interface areas and conductances

2 Sewers - Smiddotewers are treated like rivers with specified heads interface areas and conductances

11

YI 3 Recharge - Recharge is included in this model as a net

recharge which is equal to total precipitation reduced by the sum of runoff and evapotranspiration The resulting

I rate varies locally depending on land use and is applied in a cons istent steady manner throughout any simulation This particular component represents the major source of groundwater throughout the region

I 4 Strata layers - to capture the three-dimensional aspects of the region~ three strata layers have been incorporated into

rl the model Starting from the ground surface and progressing downward they include

1 Top Layer= Fill 2 Middle Layer= Stratified g1acialallivial deposits

I 3 Bottom Layer= Bedrock andor till

4 5middot0 CALIBRATION

I Using steady state inputs and performing steady-state

_I simulations the model will be calibrated such that regional heads correspond with published regional information and local heads (ie groundwater heads in and around the site) correspond with data obtained from local obser~a~ion wells Total

1 discharges to rivers and also be checked to insure

I I

(

l_G1

sewers and regional recharge rates will a valid water balance is obtained

21

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

460 SOLUTE TRANSPORT

Based on the results of the groundwater flow modeling effort one or more of the following activities will be undertaken to determirie the fate of contaminants at the site

ii 1 2D analytical analysis using flow field developed from groundwater flow model

II 2 3D analytical analysis using flow field developed from groundwater flow model

3 2D numerical analysis using flow field developed from1 groundwater flow model

4 3D numerical analysismodel which is integrated into the

I flow model

I 5 bull 00 PROPOSED PLAN FOR RISK ASSESSMENT

The proposed work plan for a risk assessment at the Silresim site

I represents a detailed approach to evaluating the public health

I and environmental risks associated with the site Inherent in this type of assessment is the incorporation of a riumber of assumptions and uncertainties concerning risk as well as the approximation of actual site and exposure conditions The quality of the assessment will be dependent upon the completeness

I of field investigation data and toxicological information and on the validi ty of exposure modeling and calculations

I To enhance the validity and quality of the Silresim risk ~ assessment the procedures outlined in EPA s Super fund Manuals will be followed GZA will utilize the following three EP~ Superfund Manuals fot guidance and information Endangerment

11 Assess1ment Handbook (Draft 885) Public Health Evaluation Manual (Draft 1285) and Exposure Assessment Manual (Draft 186)

The Remedial Investigation (RI) risk assessment will evaluate the

I potential exposures and risks associated with the site under the No-Action remedial alternative The findings of this RI baseline risk assessment will serve as a basis for comparison of

I remedial alternati vemiddots developed in the Feasibility Study CFS)

The objective of a baseline risk assessment is to identify characterize and to the extent possible quantify the migration of contaminants through environmental media to points of exposure

22

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

to human and environmental include four major analyses

bull hazard identification bull exposure asmiddotsessment bull toxicity assessment bull risk characterization

re6eptors The assessment will

TASK 1 - HAZARD IDENTIFICATION

TASK 11 - REVIEW OF SITE INVESTIGATION DATA

I Field investigation data collected during the RI will provide information on site conditions to allow the characterization of potential sources of contamination A review of information relating to the nature and extent of contamination in

I environmental media and hydrogeologic or atmospheric conditions related to the release and transport of chemicals will be conducted

Specific information on the locations types concentrations and

I distribution of chemicals at identified contaminant sources will be compiled Data on site groundwater surface water soil and air will be reviewed and summarized

I I The available information on the Silresim site indicates that

volatile organic compounds (VOCs are the predominant group of chemicals found in groundwater and soils A limited number of semi-volatiles have also been detected in sampled waters and soils The actual or potential migration of substances through groundwater and soils and the potential transport to surface waters and the atmosphere will be evaluated The observed concentrations of contaminants in the various media as well as extrapolations to future concentrations will be used

TASK 12 - SELECTION OF INDICATOR SUBSTANCES

The review of environmental sample data completed in Task 11 will provide a list of the types and concentrations of chemicaLs at the Silremiddotsim site Based on the large number of voe s and other chemicals detected at the site a smaller more manageable group of indicator substances wi 11 be selected The process middotOf selection will be based on designating those chemicals that may pose the greatest potential for public health and environmental risks The substances chosen will represent the most toxic mobile and persistent chemicals at the site The selection

23

I I GZ

process will also incorporate those chemicals present in the highest concentrations most frequently indicated in individual

I samples and present at locations in close proximity to potential receptors

For each chemical identified GZA will derive an indicator score based on the maximum and representative measured concentrations of each substance and the associated toxicity c6nstants Data will be gathered on physical and chemical prop~rties of each chemical such as solubility mobility volatility vapor pressure Henrys Law constant and octanolwater partition coefficient (Koc) Factors that may be important to assess the impact of chemicals on the environment such as bioaccumulation chemical half-lives and persistence will also be incorporated

Information on the general toxicity of each indicator substance will be compiled Toxicological data may include the classification of each substance as a non-carcinogen or carcinogen predominant acute and chronic effects to human health and the environment exposure levels potentially causing these effects and primary routes of exposure

The selection of the final list of ten to fifteen indicator substances will be chosen based on a numerical ranking of indicator scores evaluation of relative toxicity and the potential for migration based on physical and chemical properties Both top-rated non-carcinogens and carcinogens will be selected The final list may be revised as more information is gathered on the types concentrations and distribution of chemicals at the Silresim site

I The selected indicator substances will be subjected to the procedur~s of identification of exposure pathways and the estimation of exposure point concentrations and exposure intake levels outlined below

I TASK 1 3 - TOXICOLOGICAL INFORMATION

A brief toxicological profile will be completed for each selected indicator compound The prof ile-s will be based on a review of

I available literature and will include a presentation of

non-carcinogenic effects associated with acute and chronic exposure

bull approximate exposure levels assmiddotociated with non-carcinogenic effects carcinogenic potential and weight of evidence of

carcinogenicity

24

I GZmiddot1

I bull routes of exposures and bull potential impacts on aquatic life and vegetation

TASK 2 - EXPOSURE ASSESSMENT

TASK 21 - CONTAMINANT RELEASE ANALYSIS

In consideration of available data about site conditions available to GZA the potential for groundwater soils surface water and air to serve as release and transport media will be identified and evaluated in this task Each environmental medium

I will be assessed as to its ability to transport contaminants away

I from identified sources or to transfer chemicals to other media In some cases the release transport and exposure media will be the same

I Under the assumption that the groundwater and soils at the Silresim site are primary sources of contamination the possible scenar ios of release and transport mechanisms may include

bull groundwater - leachate generation groundwater flow and discharge

bull soil - surface runoff leaching and fugitive dust generation bull surface water - groundwater dismiddotcharge and stream flow and

I bull air - volatilization and fugitive dust generation

I In order to evaluate each possible release and transport scenario a qualitative release screening will be conducted The screening will include an assessment of

bull evidence or likelihood of release from each source bull nature of contaminants involved11middot bull probable magnitude of release and

I bull occurrence or possibility of transfer of chemicals to other

media

I This evaluation of potential chemical releases will be based on the following information~

bull results of Phase One and Two sampling bull output groundwater model (USGS Model - Modflow) bull de c i s i on net wor ks ( prov i d e d i n E P A s Su pmiddote r fund Exposure

Assessment Manual Draft 186) bull data provided by sources such as the soil conservation service

National Weather Service USGS etc

25

I GZ I

I Release pathways identified in the screening process will be further evaluated in a quantitative analysis The objective of this step will be to estimate media-specific release rates for each potential release at the site

The groundwater model will provide estimations of release rates into surface waters (River Meadow Brook and East Pond) sewer lines and off-site groundwater Air emission rates will be evaluated via simplified analytical models

Simplified desk top calculations outlined in the Exposure Assessment Manual will be used to estimate release rates from off-site soils into the atmosphere Releases due to

I volatilization and dust generation at Arrow Trucking Boston amp Maine Railroad area and the southeast corner of the site may be estimated based on chemical- and site-specific factors

I I Both shert-term and long-term release rates will be estimated

These rates will be used in the environmental fate analysis (Task 22) to project short-term (sub-chronic) and long-term (chronic) environmental concentrations at receptor locations

TASK 22 - ENVIRONMENTAL FATE ANALYSIS

I

I The environmental fate analysis will evaluate those areas and populations affected by released and transported indicator substances and estimate the concentrations of these chemicals in the ambient environment

The first step of the task wiLl involve a qualitative screening of environmental fate pathways Based on the potential release assessment developed in the previous task the fate of each potential release in each environmental media will be evaluated Decision networks and flow diagrams provided in the Exposure

I Assessment Manual will be used as a framework for this step The fate of substances will be reviewed as to their potential to migrate or to be transported at significant concentrations

For each substance and affected medium that passes the qualitative screening a detailed fate analysis will be completed

I Release rate estimates developed in Task 21 will provide the basis for this step The groundwater model solute transport component may be implemented to provide estimations of

middotI contaminant concentrations at potential receptors Simplified procedures in the Exposmiddoture Assessment Manual will be used to evaluate atmospheric fatemiddot CSection 4 3 1) and surf ace water fate (Section 432) and to approximate concentrations at points of exposure

26

I

I GZ I

I bull routes of exposures and bull potential impacts on aquatic life and vegetation

TASK 2 - EXPOSURE ASSESSMENT

TASK 21 - CONTAMINANT RELEASE ANALYSIS

In consideration of available data about site conditions available to GZA the potential for groundwater soils surface water and air to serve as release and transport media will be identified and evaluated in this task Each environmental medium

I will be assessed as to its ability to transport contaminants away

I from identified sources or to transfer chemicals to other media In some cases the release transport and exposure media will be the same

I Under the assumption that the groundwater and soils at the Silresim site are primary sources of contamination the possible scenar ios of release and transport mechanisms may include

bull groundwater - leachate generation groundwater flow and discharge

bull soil - surface runoff leaching and fugitive dust generation bull surface water - groundwater dismiddotcharge and stream flow and

I bull air - volatilization and fugitive dust generation

I In order to evaluate each possible release and transport scenario a qualitative release screening will be conducted The screening will include an assessment of

bull evidence or likelihood of release from each source bull nature of contaminants involved11middot bull probable magnitude of release and

I bull occurrence or possibility of transfer of chemicals to other

media

I This evaluation of potential chemical releases will be based on the following information~

bull results of Phase One and Two sampling bull output groundwater model (USGS Model - Modflow) bull de c i s i on net wor ks ( prov i d e d i n E P A s Su pmiddote r fund Exposure

Assessment Manual Draft 186) bull data provided by sources such as the soil conservation service

National Weather Service USGS etc

25

I GZ I

I Release pathways identified in the screening process will be further evaluated in a quantitative analysis The objective of this step will be to estimate media-specific release rates for each potential release at the site

The groundwater model will provide estimations of release rates into surface waters (River Meadow Brook and East Pond) sewer lines and off-site groundwater Air emission rates will be evaluated via simplified analytical models

Simplified desk top calculations outlined in the Exposure Assessment Manual will be used to estimate release rates from off-site soils into the atmosphere Releases due to

I volatilization and dust generation at Arrow Trucking Boston amp Maine Railroad area and the southeast corner of the site may be estimated based on chemical- and site-specific factors

I I Both shert-term and long-term release rates will be estimated

These rates will be used in the environmental fate analysis (Task 22) to project short-term (sub-chronic) and long-term (chronic) environmental concentrations at receptor locations

TASK 22 - ENVIRONMENTAL FATE ANALYSIS

I

I The environmental fate analysis will evaluate those areas and populations affected by released and transported indicator substances and estimate the concentrations of these chemicals in the ambient environment

The first step of the task wiLl involve a qualitative screening of environmental fate pathways Based on the potential release assessment developed in the previous task the fate of each potential release in each environmental media will be evaluated Decision networks and flow diagrams provided in the Exposure

I Assessment Manual will be used as a framework for this step The fate of substances will be reviewed as to their potential to migrate or to be transported at significant concentrations

For each substance and affected medium that passes the qualitative screening a detailed fate analysis will be completed

I Release rate estimates developed in Task 21 will provide the basis for this step The groundwater model solute transport component may be implemented to provide estimations of

middotI contaminant concentrations at potential receptors Simplified procedures in the Exposmiddoture Assessment Manual will be used to evaluate atmospheric fatemiddot CSection 4 3 1) and surf ace water fate (Section 432) and to approximate concentrations at points of exposure

26

I

I GZ I

I Release pathways identified in the screening process will be further evaluated in a quantitative analysis The objective of this step will be to estimate media-specific release rates for each potential release at the site

The groundwater model will provide estimations of release rates into surface waters (River Meadow Brook and East Pond) sewer lines and off-site groundwater Air emission rates will be evaluated via simplified analytical models

Simplified desk top calculations outlined in the Exposure Assessment Manual will be used to estimate release rates from off-site soils into the atmosphere Releases due to

I volatilization and dust generation at Arrow Trucking Boston amp Maine Railroad area and the southeast corner of the site may be estimated based on chemical- and site-specific factors

I I Both shert-term and long-term release rates will be estimated

These rates will be used in the environmental fate analysis (Task 22) to project short-term (sub-chronic) and long-term (chronic) environmental concentrations at receptor locations

TASK 22 - ENVIRONMENTAL FATE ANALYSIS

I

I The environmental fate analysis will evaluate those areas and populations affected by released and transported indicator substances and estimate the concentrations of these chemicals in the ambient environment

The first step of the task wiLl involve a qualitative screening of environmental fate pathways Based on the potential release assessment developed in the previous task the fate of each potential release in each environmental media will be evaluated Decision networks and flow diagrams provided in the Exposure

I Assessment Manual will be used as a framework for this step The fate of substances will be reviewed as to their potential to migrate or to be transported at significant concentrations

For each substance and affected medium that passes the qualitative screening a detailed fate analysis will be completed

I Release rate estimates developed in Task 21 will provide the basis for this step The groundwater model solute transport component may be implemented to provide estimations of

middotI contaminant concentrations at potential receptors Simplified procedures in the Exposmiddoture Assessment Manual will be used to evaluate atmospheric fatemiddot CSection 4 3 1) and surf ace water fate (Section 432) and to approximate concentrations at points of exposure

26

I

I GZ I

I I

TASK 2 3 - EXPOSURE PATHWAY AND EXPOSED POPULATION ANALYSIS

I

This task will be comprised of the determination of complete exposure pathways and the characterization of potential receptors A complete exposure pathway includes a source of release transport media and pathways exposure receptors and routes of

I exposure such as ingestion inhalation or direct contact Environmental fate data will be correlated with receptor population data to determine the potential migration of substances to points of exposure The inventory of potential receptors completed as part of this deliverable describes exposure pathways identified at this time This information is summarized in Table 1 and includes the following potential receptors

Residences

Robinson Street Canada Street Maple Street Main Street Cottage Place

I Industrial Areas

Lowell Iron and Steel Lowell Used Auto Parts James Bond Auto Sales B ~ L Used Auto Parts Walbert Plastics Union Sheet Metal Arrow Carrier

Surface Waters

River Meadow Brook East Pond Concord River Merrimack River

Other

City of Lowell Sewer Lines Duck Island Treatment Plant

I This task will include a more detailed characterization of the location number and general demographics of each potential

I 27

I GZ I

I receptor Additional information may be provided by census data and the residential well survey Data gathered on land and water use patterns and site access will be incorporated

The output of this task will be a map of potential receptors and an estimate of the environmental concentrations in the applicable media at each point of exposure These estimated exposure levels will then be compared to applicable Federal and State public health and environmental standards and guidelines such as

bull EPAs MCLs RMCLs and Health Advisories for drinking water bull EPAs Water Quality Criteria for drinking water and aquatic

organisms bull EPAs NAAQS for air quality bull OSHANIOSH and ACGIH exposure limits bull EPAs Health Effects Assessment Documents and bull EPAs Reference Doses (RfDs) and ADis

I The comparison of estimated environmental contaminant concentrations with applicable standards completed will be the primary basis for assessing adverse effects to the environment Manymiddot chemicals may not have standards or guidelines for comparison Therefore the characteristics of indicator substances developed in Task 12 will provide primary information on the potential toxicity and possible long-term impacts of these chemicals on the environment

TASK 24 - ESTIMATION OF CHEMICAL INTAKES

Thosmiddote scenarios for which a complete human exposure pathway is determined an estimate of exposure intake levels for selected indicator contaminants will be derived bullThese estimates will serve as a basis to assess the potential overall risk to public health associated with chemicals at the Silresim site

I Human intake levels in mgkgday will be calculated separately for exposures to chemical contaminants in each environment medium such as groundwater surface water soils or air For

I each population-at-risk pathway-specific intakes will be combined to yield total intakes for the various routes of exposure such as ingestion inhalation or direct contact These

I total intake levels will be compared to applicable acceptable intakes for non-carcinogens and multiplied by potency factors for carcinogens in the toxicity assessment

Since short-term (sub-chronic exposures) to relatively high concentrations of contaminants may result in different toxic emiddotff ects than those caused by long-term C chronic exposuresgt to

28

I lower concentrations two intake levels will be calculated for each chemical A sub-chronic daily intake (SDI) level will be estimated based on short-term concentrations derived in Task 23

I A chronic daily intake (CDI) level will be calculated using long-term concentrations

I TASK 3 - TOXICITY ASSESSMENT

I The information compiled in this task will be used in conjunction with estimated intake levels (Task 24) to characterize potential risk (Task 4) For each indicator substance and exposure pathway

I a critical toxicity value will be gathered The value ( s) will

I be specific to the length of exposure sub-chronic and chronic and the route of exposure ingestion or inhalation The vah1es used in the task may include

bull acceptable intakes for sub-chronic exposure (AIS)

I bull acceptable intakes for chronic exposure (AIC) middot Verified Acceptable Daily Intakes CADis) or References Doses

(RfDs) and bull car c in ogen i c potency factors Cf or potential care inogen ic

I effects only)

These critical toxicity values are based on empirical data and will not be ad justed for site-spec if ic condi tions Therefore projected intake levels may be overestimated or underestimated In order to assess the overall uncertainty associated with these estimates site-specific factors that may potentially affect the results will be identified and qualitatively assessed These factors may include

middot minor pathways not included in the quantified exposure assessment smiddotuch as ingestion of water by swimmers

bull overall adequacy of site characterization and sampling data bull percent1ge of site chemicals (number and volume) that were

evaluated bull presence and characteristics of sensitive populations or bull evidence of chemical or biological interactions

I 29

I GZ I

I I

TASK 4 - RISK CHARACTERIZATION

I I

In this task the overall potential of non-carcinogenic and carcinogenic effects of indicator substances will be evaluated The evaluation will be conducted for both single chemical exposures and multiple chemical exposures

I Non-Carcinogenic Effects

For each chemical imiddotdentified to potentially result in non-carcinogenic effects the projected daily intake levels (SDI and CDI) will be divided by its respective acceptable intake level CAIS AIC ADI or RfD) Any single chemical with an exposure intake level greater than the acceptable level will yield a fraction greater than unity and therefore represents a potential non-carcinogenic health risk

I To assess multiple exposures the singie exposure fractions will be summed to yield an overall hazard index Again a hazard index greater than one may indicate that a potential non-carcinogenic health risk exists

The summation process is based on the assumption of dose additivity and should be appLied when compounds induce the same toxic effect by a similar mechanism In those cases for which chemicals are known to exhibit similar toxic effects a separate hazard index will be developed

Carcinogenic Effects

I For chemicals classified as potential carcinogens risks

from exposure will be expressed as probabilities The calculatedmiddot

I intake levels SDI and CD1) for each single exposure will be multiplied by its respective carcinogenic potency poundactor C(mgkgday-1)) Single exposure risks will be combined to estimate route-specific and chemical-specific risksmiddot A total risk for multiple exposures will be estimated by combining the risks for each chemical The resultant number will represent the

I upper-bound estimate of incremental risk at each exposure point

I This risk summation is based on the assumption that

individual intakes are small and that the chemicals involved are acting independently (ie no synergism or antagonism)

I 30

I I

TASK 5 - REPORT PREPARATION

I The results of Tasks 1 through 4 will be summarized and presented in Deliverable No 6 of the RI report The report w i 11 inc 1 ude

1 the primary data compiled a description 0pound procedures utilized

I and the rationale followed to generate the output of each task The conclusions of the report will evaluate the potential human and environmental exposures and risks associated with the site No-Action 11

Remedial Alternati ve

I 6 0middot0 EVALUATION AND SCREENING OF POTENTIAL RECEPTORS

I I As called for by the work plan for the Silresim RIFS an initial

inventory of potential receptors was completed by Goldbergshyzoino amp Associatemiddots (GZA and was included as part of Deliverable No 2 (February 1986 This inventory identified theoretically possible receptors and associated exposure pathways at or near the Si 1 res i m s it e bas e d on b a ck g round i n f o rmat i on and s i t e investigation data aviilable at that time ~he evaluatioh considered possible adverse impacts on both the human population and environmental conditions

1

The preliminary results of the RIFS Phase One sampling program (Deliverable No 3) provide additional information on the study area and on the nature and extent of contamination originating at the Silresim Site This information has been used to reevaluate the initial inventory of potential receptomiddotrs and to qualitatively

I assess the probable exposures associated with the chemicals at the site A more extensive inventory and final evaluation of the most likely potential receptors will be completed based on

I information provided by the Phase Two sampling programr the residential well inventory and additional site information The findings of this final inventory will serve as the ini tial phase of the Risk Assessment (Task XI) to be suhmi tted as part -of the Draft RI report (Deliverable No 6) middot

I 6 lO ENVIRONMENTAL RELEASE MEDIA

I The groundwater and soils at the Si1resim site have been considered the primary media for contaminant transport from the site The predominant contaminants found in groundwater and soils have been volatile organic compounds CVOCs) although a limited number of semi-volatiles have also been detected in soifil and water samples

I 31

1 I GZ

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I receptor Additional information may be provided by census data and the residential well survey Data gathered on land and water use patterns and site access will be incorporated

The output of this task will be a map of potential receptors and an estimate of the environmental concentrations in the applicable media at each point of exposure These estimated exposure levels will then be compared to applicable Federal and State public health and environmental standards and guidelines such as

bull EPAs MCLs RMCLs and Health Advisories for drinking water bull EPAs Water Quality Criteria for drinking water and aquatic

organisms bull EPAs NAAQS for air quality bull OSHANIOSH and ACGIH exposure limits bull EPAs Health Effects Assessment Documents and bull EPAs Reference Doses (RfDs) and ADis

I The comparison of estimated environmental contaminant concentrations with applicable standards completed will be the primary basis for assessing adverse effects to the environment Manymiddot chemicals may not have standards or guidelines for comparison Therefore the characteristics of indicator substances developed in Task 12 will provide primary information on the potential toxicity and possible long-term impacts of these chemicals on the environment

TASK 24 - ESTIMATION OF CHEMICAL INTAKES

Thosmiddote scenarios for which a complete human exposure pathway is determined an estimate of exposure intake levels for selected indicator contaminants will be derived bullThese estimates will serve as a basis to assess the potential overall risk to public health associated with chemicals at the Silresim site

I Human intake levels in mgkgday will be calculated separately for exposures to chemical contaminants in each environment medium such as groundwater surface water soils or air For

I each population-at-risk pathway-specific intakes will be combined to yield total intakes for the various routes of exposure such as ingestion inhalation or direct contact These

I total intake levels will be compared to applicable acceptable intakes for non-carcinogens and multiplied by potency factors for carcinogens in the toxicity assessment

Since short-term (sub-chronic exposures) to relatively high concentrations of contaminants may result in different toxic emiddotff ects than those caused by long-term C chronic exposuresgt to

28

I lower concentrations two intake levels will be calculated for each chemical A sub-chronic daily intake (SDI) level will be estimated based on short-term concentrations derived in Task 23

I A chronic daily intake (CDI) level will be calculated using long-term concentrations

I TASK 3 - TOXICITY ASSESSMENT

I The information compiled in this task will be used in conjunction with estimated intake levels (Task 24) to characterize potential risk (Task 4) For each indicator substance and exposure pathway

I a critical toxicity value will be gathered The value ( s) will

I be specific to the length of exposure sub-chronic and chronic and the route of exposure ingestion or inhalation The vah1es used in the task may include

bull acceptable intakes for sub-chronic exposure (AIS)

I bull acceptable intakes for chronic exposure (AIC) middot Verified Acceptable Daily Intakes CADis) or References Doses

(RfDs) and bull car c in ogen i c potency factors Cf or potential care inogen ic

I effects only)

These critical toxicity values are based on empirical data and will not be ad justed for site-spec if ic condi tions Therefore projected intake levels may be overestimated or underestimated In order to assess the overall uncertainty associated with these estimates site-specific factors that may potentially affect the results will be identified and qualitatively assessed These factors may include

middot minor pathways not included in the quantified exposure assessment smiddotuch as ingestion of water by swimmers

bull overall adequacy of site characterization and sampling data bull percent1ge of site chemicals (number and volume) that were

evaluated bull presence and characteristics of sensitive populations or bull evidence of chemical or biological interactions

I 29

I GZ I

I I

TASK 4 - RISK CHARACTERIZATION

I I

In this task the overall potential of non-carcinogenic and carcinogenic effects of indicator substances will be evaluated The evaluation will be conducted for both single chemical exposures and multiple chemical exposures

I Non-Carcinogenic Effects

For each chemical imiddotdentified to potentially result in non-carcinogenic effects the projected daily intake levels (SDI and CDI) will be divided by its respective acceptable intake level CAIS AIC ADI or RfD) Any single chemical with an exposure intake level greater than the acceptable level will yield a fraction greater than unity and therefore represents a potential non-carcinogenic health risk

I To assess multiple exposures the singie exposure fractions will be summed to yield an overall hazard index Again a hazard index greater than one may indicate that a potential non-carcinogenic health risk exists

The summation process is based on the assumption of dose additivity and should be appLied when compounds induce the same toxic effect by a similar mechanism In those cases for which chemicals are known to exhibit similar toxic effects a separate hazard index will be developed

Carcinogenic Effects

I For chemicals classified as potential carcinogens risks

from exposure will be expressed as probabilities The calculatedmiddot

I intake levels SDI and CD1) for each single exposure will be multiplied by its respective carcinogenic potency poundactor C(mgkgday-1)) Single exposure risks will be combined to estimate route-specific and chemical-specific risksmiddot A total risk for multiple exposures will be estimated by combining the risks for each chemical The resultant number will represent the

I upper-bound estimate of incremental risk at each exposure point

I This risk summation is based on the assumption that

individual intakes are small and that the chemicals involved are acting independently (ie no synergism or antagonism)

I 30

I I

TASK 5 - REPORT PREPARATION

I The results of Tasks 1 through 4 will be summarized and presented in Deliverable No 6 of the RI report The report w i 11 inc 1 ude

1 the primary data compiled a description 0pound procedures utilized

I and the rationale followed to generate the output of each task The conclusions of the report will evaluate the potential human and environmental exposures and risks associated with the site No-Action 11

Remedial Alternati ve

I 6 0middot0 EVALUATION AND SCREENING OF POTENTIAL RECEPTORS

I I As called for by the work plan for the Silresim RIFS an initial

inventory of potential receptors was completed by Goldbergshyzoino amp Associatemiddots (GZA and was included as part of Deliverable No 2 (February 1986 This inventory identified theoretically possible receptors and associated exposure pathways at or near the Si 1 res i m s it e bas e d on b a ck g round i n f o rmat i on and s i t e investigation data aviilable at that time ~he evaluatioh considered possible adverse impacts on both the human population and environmental conditions

1

The preliminary results of the RIFS Phase One sampling program (Deliverable No 3) provide additional information on the study area and on the nature and extent of contamination originating at the Silresim Site This information has been used to reevaluate the initial inventory of potential receptomiddotrs and to qualitatively

I assess the probable exposures associated with the chemicals at the site A more extensive inventory and final evaluation of the most likely potential receptors will be completed based on

I information provided by the Phase Two sampling programr the residential well inventory and additional site information The findings of this final inventory will serve as the ini tial phase of the Risk Assessment (Task XI) to be suhmi tted as part -of the Draft RI report (Deliverable No 6) middot

I 6 lO ENVIRONMENTAL RELEASE MEDIA

I The groundwater and soils at the Si1resim site have been considered the primary media for contaminant transport from the site The predominant contaminants found in groundwater and soils have been volatile organic compounds CVOCs) although a limited number of semi-volatiles have also been detected in soifil and water samples

I 31

1 I GZ

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I lower concentrations two intake levels will be calculated for each chemical A sub-chronic daily intake (SDI) level will be estimated based on short-term concentrations derived in Task 23

I A chronic daily intake (CDI) level will be calculated using long-term concentrations

I TASK 3 - TOXICITY ASSESSMENT

I The information compiled in this task will be used in conjunction with estimated intake levels (Task 24) to characterize potential risk (Task 4) For each indicator substance and exposure pathway

I a critical toxicity value will be gathered The value ( s) will

I be specific to the length of exposure sub-chronic and chronic and the route of exposure ingestion or inhalation The vah1es used in the task may include

bull acceptable intakes for sub-chronic exposure (AIS)

I bull acceptable intakes for chronic exposure (AIC) middot Verified Acceptable Daily Intakes CADis) or References Doses

(RfDs) and bull car c in ogen i c potency factors Cf or potential care inogen ic

I effects only)

These critical toxicity values are based on empirical data and will not be ad justed for site-spec if ic condi tions Therefore projected intake levels may be overestimated or underestimated In order to assess the overall uncertainty associated with these estimates site-specific factors that may potentially affect the results will be identified and qualitatively assessed These factors may include

middot minor pathways not included in the quantified exposure assessment smiddotuch as ingestion of water by swimmers

bull overall adequacy of site characterization and sampling data bull percent1ge of site chemicals (number and volume) that were

evaluated bull presence and characteristics of sensitive populations or bull evidence of chemical or biological interactions

I 29

I GZ I

I I

TASK 4 - RISK CHARACTERIZATION

I I

In this task the overall potential of non-carcinogenic and carcinogenic effects of indicator substances will be evaluated The evaluation will be conducted for both single chemical exposures and multiple chemical exposures

I Non-Carcinogenic Effects

For each chemical imiddotdentified to potentially result in non-carcinogenic effects the projected daily intake levels (SDI and CDI) will be divided by its respective acceptable intake level CAIS AIC ADI or RfD) Any single chemical with an exposure intake level greater than the acceptable level will yield a fraction greater than unity and therefore represents a potential non-carcinogenic health risk

I To assess multiple exposures the singie exposure fractions will be summed to yield an overall hazard index Again a hazard index greater than one may indicate that a potential non-carcinogenic health risk exists

The summation process is based on the assumption of dose additivity and should be appLied when compounds induce the same toxic effect by a similar mechanism In those cases for which chemicals are known to exhibit similar toxic effects a separate hazard index will be developed

Carcinogenic Effects

I For chemicals classified as potential carcinogens risks

from exposure will be expressed as probabilities The calculatedmiddot

I intake levels SDI and CD1) for each single exposure will be multiplied by its respective carcinogenic potency poundactor C(mgkgday-1)) Single exposure risks will be combined to estimate route-specific and chemical-specific risksmiddot A total risk for multiple exposures will be estimated by combining the risks for each chemical The resultant number will represent the

I upper-bound estimate of incremental risk at each exposure point

I This risk summation is based on the assumption that

individual intakes are small and that the chemicals involved are acting independently (ie no synergism or antagonism)

I 30

I I

TASK 5 - REPORT PREPARATION

I The results of Tasks 1 through 4 will be summarized and presented in Deliverable No 6 of the RI report The report w i 11 inc 1 ude

1 the primary data compiled a description 0pound procedures utilized

I and the rationale followed to generate the output of each task The conclusions of the report will evaluate the potential human and environmental exposures and risks associated with the site No-Action 11

Remedial Alternati ve

I 6 0middot0 EVALUATION AND SCREENING OF POTENTIAL RECEPTORS

I I As called for by the work plan for the Silresim RIFS an initial

inventory of potential receptors was completed by Goldbergshyzoino amp Associatemiddots (GZA and was included as part of Deliverable No 2 (February 1986 This inventory identified theoretically possible receptors and associated exposure pathways at or near the Si 1 res i m s it e bas e d on b a ck g round i n f o rmat i on and s i t e investigation data aviilable at that time ~he evaluatioh considered possible adverse impacts on both the human population and environmental conditions

1

The preliminary results of the RIFS Phase One sampling program (Deliverable No 3) provide additional information on the study area and on the nature and extent of contamination originating at the Silresim Site This information has been used to reevaluate the initial inventory of potential receptomiddotrs and to qualitatively

I assess the probable exposures associated with the chemicals at the site A more extensive inventory and final evaluation of the most likely potential receptors will be completed based on

I information provided by the Phase Two sampling programr the residential well inventory and additional site information The findings of this final inventory will serve as the ini tial phase of the Risk Assessment (Task XI) to be suhmi tted as part -of the Draft RI report (Deliverable No 6) middot

I 6 lO ENVIRONMENTAL RELEASE MEDIA

I The groundwater and soils at the Si1resim site have been considered the primary media for contaminant transport from the site The predominant contaminants found in groundwater and soils have been volatile organic compounds CVOCs) although a limited number of semi-volatiles have also been detected in soifil and water samples

I 31

1 I GZ

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I I

TASK 4 - RISK CHARACTERIZATION

I I

In this task the overall potential of non-carcinogenic and carcinogenic effects of indicator substances will be evaluated The evaluation will be conducted for both single chemical exposures and multiple chemical exposures

I Non-Carcinogenic Effects

For each chemical imiddotdentified to potentially result in non-carcinogenic effects the projected daily intake levels (SDI and CDI) will be divided by its respective acceptable intake level CAIS AIC ADI or RfD) Any single chemical with an exposure intake level greater than the acceptable level will yield a fraction greater than unity and therefore represents a potential non-carcinogenic health risk

I To assess multiple exposures the singie exposure fractions will be summed to yield an overall hazard index Again a hazard index greater than one may indicate that a potential non-carcinogenic health risk exists

The summation process is based on the assumption of dose additivity and should be appLied when compounds induce the same toxic effect by a similar mechanism In those cases for which chemicals are known to exhibit similar toxic effects a separate hazard index will be developed

Carcinogenic Effects

I For chemicals classified as potential carcinogens risks

from exposure will be expressed as probabilities The calculatedmiddot

I intake levels SDI and CD1) for each single exposure will be multiplied by its respective carcinogenic potency poundactor C(mgkgday-1)) Single exposure risks will be combined to estimate route-specific and chemical-specific risksmiddot A total risk for multiple exposures will be estimated by combining the risks for each chemical The resultant number will represent the

I upper-bound estimate of incremental risk at each exposure point

I This risk summation is based on the assumption that

individual intakes are small and that the chemicals involved are acting independently (ie no synergism or antagonism)

I 30

I I

TASK 5 - REPORT PREPARATION

I The results of Tasks 1 through 4 will be summarized and presented in Deliverable No 6 of the RI report The report w i 11 inc 1 ude

1 the primary data compiled a description 0pound procedures utilized

I and the rationale followed to generate the output of each task The conclusions of the report will evaluate the potential human and environmental exposures and risks associated with the site No-Action 11

Remedial Alternati ve

I 6 0middot0 EVALUATION AND SCREENING OF POTENTIAL RECEPTORS

I I As called for by the work plan for the Silresim RIFS an initial

inventory of potential receptors was completed by Goldbergshyzoino amp Associatemiddots (GZA and was included as part of Deliverable No 2 (February 1986 This inventory identified theoretically possible receptors and associated exposure pathways at or near the Si 1 res i m s it e bas e d on b a ck g round i n f o rmat i on and s i t e investigation data aviilable at that time ~he evaluatioh considered possible adverse impacts on both the human population and environmental conditions

1

The preliminary results of the RIFS Phase One sampling program (Deliverable No 3) provide additional information on the study area and on the nature and extent of contamination originating at the Silresim Site This information has been used to reevaluate the initial inventory of potential receptomiddotrs and to qualitatively

I assess the probable exposures associated with the chemicals at the site A more extensive inventory and final evaluation of the most likely potential receptors will be completed based on

I information provided by the Phase Two sampling programr the residential well inventory and additional site information The findings of this final inventory will serve as the ini tial phase of the Risk Assessment (Task XI) to be suhmi tted as part -of the Draft RI report (Deliverable No 6) middot

I 6 lO ENVIRONMENTAL RELEASE MEDIA

I The groundwater and soils at the Si1resim site have been considered the primary media for contaminant transport from the site The predominant contaminants found in groundwater and soils have been volatile organic compounds CVOCs) although a limited number of semi-volatiles have also been detected in soifil and water samples

I 31

1 I GZ

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I I

TASK 5 - REPORT PREPARATION

I The results of Tasks 1 through 4 will be summarized and presented in Deliverable No 6 of the RI report The report w i 11 inc 1 ude

1 the primary data compiled a description 0pound procedures utilized

I and the rationale followed to generate the output of each task The conclusions of the report will evaluate the potential human and environmental exposures and risks associated with the site No-Action 11

Remedial Alternati ve

I 6 0middot0 EVALUATION AND SCREENING OF POTENTIAL RECEPTORS

I I As called for by the work plan for the Silresim RIFS an initial

inventory of potential receptors was completed by Goldbergshyzoino amp Associatemiddots (GZA and was included as part of Deliverable No 2 (February 1986 This inventory identified theoretically possible receptors and associated exposure pathways at or near the Si 1 res i m s it e bas e d on b a ck g round i n f o rmat i on and s i t e investigation data aviilable at that time ~he evaluatioh considered possible adverse impacts on both the human population and environmental conditions

1

The preliminary results of the RIFS Phase One sampling program (Deliverable No 3) provide additional information on the study area and on the nature and extent of contamination originating at the Silresim Site This information has been used to reevaluate the initial inventory of potential receptomiddotrs and to qualitatively

I assess the probable exposures associated with the chemicals at the site A more extensive inventory and final evaluation of the most likely potential receptors will be completed based on

I information provided by the Phase Two sampling programr the residential well inventory and additional site information The findings of this final inventory will serve as the ini tial phase of the Risk Assessment (Task XI) to be suhmi tted as part -of the Draft RI report (Deliverable No 6) middot

I 6 lO ENVIRONMENTAL RELEASE MEDIA

I The groundwater and soils at the Si1resim site have been considered the primary media for contaminant transport from the site The predominant contaminants found in groundwater and soils have been volatile organic compounds CVOCs) although a limited number of semi-volatiles have also been detected in soifil and water samples

I 31

1 I GZ

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I

I

The compounds present in the environmental media on-site could be transported off-site through the movement of the groundwater and soils or they could be released into other media such as air or surface waters Possible scenarios of release or transport media and their associated mechanisms of action are identified in Task 2 2 of the proposed plan for risk asmiddotsessment

620 EVALUATION OF POTENTIAL RECEPTORS

I The potential for the release and transport of compounds to the locations of middotreceptors must exist for exposures and risks to be present The following sections describe possible scenarios of

I exposure pathways including transport media migration pathways

I points of exposure and routes of exposure In addition amiddot qualitative assessment of human health and environmental impacts has been conducted The potential receptors are identified in Task 24 of the proposed plan

I ~21 Groundwater

I The groundwater underlying the Silresim site is considered

to be the primary medium of contaminant transport at the site The preliminary results of the Phase One sampling program have characterized the general groundwater flow regime and contaminant distribution at the site This information can be used to determine possible patterns for the transport of chemicals from the site and to project the potential fate of selected indicator substances

I GZAs preliminary investigation of groundwater flow patterns suggest the following findings

I bull Primary groundwater flow directions appear to be northnorthwest

1 bull Secondary flow directions appear to be east and west bull An apparent groundwater mound at the site appears to

result in a radial flow pattern and bull Sewer lines located around the periphery of the site

appear to serve as discharge zones for groundwater

I Primary Groundwater Flow

I A number of the potential identified receptors are

I situated along the pathway of primary groundwater flow The industrial areas on Tanner Street residences on Robinson Street and River Meadow Brook could possibly be impacted by groundwater containing voes and other compounds

32

I GZ

I

I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I I

a Supply Wells

I A primary point of exposure could be the

I existence of residential and commercial supply wells located downgradient of the Silresim site GZA s research of city records and USGS data has

I not identified any water supply wells in the study area However GZA will conduct a survey in the coming months to identify the presence of wells

The present or future use of supply wells

I downgradient of the site as a drinking water

I source or for industrial purposes could serve as a pathway for potential exposure The most significant route of exposure is likely to be through the ingestion of water Secondary routes

I of exposure could be direct contact to water or inhalation of vapors emanating from water

b Basement Seepage

I Groundwater flowing from the Silresim site could

I also impact residences and industries through the seepage of contaminated groundwater into basements The inhalation of vapors emanating from the water leaking into basements could be a potential route for exposure In addition direct contact to this water could be possible

I In conjunction with the supply well snrvey GZA

I will gather information on the incidence of basement seepage in industries on Tanner Street and residences on Robinson Street

Secondary Groundwater Flow

I The preliminary examination of the groundwater flow

I

regime at the Silresim site has identified an apparent groundshywater mound in the northeast area of the site middotA localiamped flow regime emanating radially from the site is indicated by recent data In addition branch sewer lines along Canada Tanner and Maple Streets may potentially have impacts on local groundwater flow The dominance of this local groundwater flow regime may lead to a potential impact on residences on Canada Main and Maple Streets arid Cottage Place the Arrow Carrier property and the East Pond

I 33

I GZ I

I I An assessment of the areal distribution of total voes

in groundwater suggests that the contaminant plume may extend to the northern portion of the Arrow property and to the east of the

I B amp M railroad tracks Additional data is needed to assess the interaction between groundwater flow and contaminant distribution in these areas before more detailed conclusions can be drawn

I I Based on the available information points of exposure

could occur from residential and commercial supply wells and basement seepage Potential routes of exposure might include ingestion in ha 1 at i on or di rec t cont a ct bull The survey to be conducted by GZA will identify wells and basement seepage at suspected locations to the south of the site

I 622 surface Water

I I G r o u n d water may s er v e a s a _car r i er o f ch e mi ca 1 s f r om

contaminated soils to other environmental media such as surf ace water This transfer occurs through the mechanism of groundwater discharge Two surface water bodies River Mead ow Brook to the northwest and the East Pond to the east are located close enough to the Silresim Site to be considered as possible receptors

I River Meadow Brook

I River Meadow Hrook is located to the northwest of the

Silresim site and has been identified as a potential discharge zone for groundwater from the site People using the brook for recreational activities such as swimming fishing and boating could possibly be exposed to chemicals in the water Exposure

I could occur through direct contact to waters inhalation of

I vapors released from the water and accidental ingestion of water Wildlife and plants surrounding the brook could be impacted through contact with and uptake of compounds in the surf ace water

I River Meadow Brook discharges into the_Concord River which subsequently merges with the Merrimack River The Merr imack is used as a source of drinking water for the cities of Lawrence and Methuen While exposure to compounds in the water

I is theoretically possible through the routes of ingestion direct

I contact and inhalation the concentrations of chemicals in the water would be expected to have attenuated and significantly through the processes of dilution dispersion biodegradation and volatilization before reaching these downstream receptors

I The potential for exposmiddoture to voes from the Si1resim Site in River Meadow Brook is not likely to be significant for

34

I I two reasons First the preliminary analytical data on surface

water and sediment samples from the brook indicate only tramiddotce levels of volatile organics and non-detectable levels of most

I semi-volatiles and metals A possible exception is sample SW-3

I collected near the Jet-Line facility GZAs preliminary finding based on this data is that grmmdwater discharging to the brook does not appear to be significantly impacting this surface water

I In addition River Meadow Brook is limited in depth

and is slow moving The use of the brook for most recreational activities appears to be unlikely An exception may be the use of a path by joggers along the west bank of the brook Joggers may potentially inhale volatiles released from surface water

East Pond

I A small pond is located to the east of the Silresim site The pond may receive groundwater discharge from the local flow regime The pond could be used for recreational activities and serve as a habitat or feeding area fmiddotor wildlife bull 1

I GZA staff have observed children rafting on the pond

Exposures through direct contact to water inhalation of volatiles and accidental ingestion of water is possible Birds and small animals have been seen in the pond area

I 623 Sewer Lines

Background research on the Lowell sewer system has identified the presence of several old large-diameter sewer

I lines in the vicinity of the Silresim site GZAs preliminary

I dat-a on groundwater flow suggest that the sewer lines could be a receptor of groundwater discharge This finding may prove to be significant in the evaluation of potential receptors

1middot The groundwater flow pattern at the site may be

substantially altered by the presence of both the main and branch lines The main sewer lines could act as a partial barrier to groundwater flowing to potential receptorson Tanner Street Robinson Street and River Meadow Brook Branch sewer lines may

I have similar impacts on groundwater flow toward Canada Main and

I Maple Streets The available data indicate that elevated levels 0pound voes do not appear to extend north of the sewer line which traversmiddotes Lowell Iron and Steel or west of the Tanner Street sewer The groundwater plume has not been observed to have reached as far south as the branch sewemiddotr lines

35

I I The transmission of groundwater to the sewer lines creates

an additional source of theoretically possible exposures The main sewer line accepting materials from various branch lines

I flows to the east to the Duck Island Treatment Plant Any voes specifically treated will experience significant attenuation

I middotthrough aeration or removal with solids If any chemicals remain iri the treated sewage they will be discharged in the effluent to the Merrimack River

I Samples collected from the manholes of the sewer lines immediately adjacent to the Silresim site indicate that levels of voes are highest at MH-2 (see Figure 3) This manhole is -located at the intersection of the branch and main sewer lines A sample

I collected at MH~4 downstream on the main line indicates an

I I

order of magnitude attenuation in the concentration of voes Based on the large volume of sewerage carried by the sewer lines and the processes of dilution and volatilization expected to occur the concentrations of compounds reaching the Duck Island Treatment Plant are not likely to be significant However further studies of impacts resulting from groundwater infiltrating into the sewer lines including potential impacts on workers at the treatment plant will be conducted in the Phase Two program

I 624 Soils

I Soils at or near the Silresim site may become contaminated by s ever a 1 me ch an i s ms Ch em i ca 1 s i n g r o u n d w a t e r may be transferred to adjacent soils through seepage or by volatilization through porous soils In addition surface runoff from potentially contaminated zones beyond the limits of the clay cap may result in local migration of voes within the study area

I I Screening for voes in surficial soils from outside the

Silresim site perimeter and on th~ Arrow Carrier property was conducted in Phase One by GZA Samples that registered total voe levels greater than 1 ppm on both the H-Nu and the OVA were collected on the Arrow Carrier site and adjacent to the B amp M railroad tracks Subsequent GC screening indicated the presence in most of these samples of volatile organic compounds considered

I consistent with those previously detected on the Silresim site

I Direct contact with soils contaihing voes could be a

possible route of exposure Employees at Arrow Carrier children

I playing in the soils and wildlife traversing the area could be possible receptors The inhalation of volatiles released into the atmosphere from off-site soils and inhalation of fugitive dust could be secondary routes of exposure Children have been

I 36

I CiZ I

I I I I I I I I I I

I I I I I I

observed riding motorbikes along the beds of the railroad tracks In addition joggers have been seen running along these tracks Exposure could potentially occur through the inhalation of vapors and generated dust

In addition plants growing in these soils could absorb compounds from soils The ingestion of vegetables grown in nearby gardens could be a potential route o~ exposure The burning of vegetation could release volatiles and semi-volatiles into the atmosphere

6 25 Air

As described in the previous sections volatile organic compounds may be released into the atmosphere from off-site groundwater surface water and soils Potential exposure through the inhalation of vapors could theoretically occur to nearby residents and workers Metals and semi-volatiles may be absorbed on suspended particulate matter Inhalation of the respirable particulate fraction may contribute to exposure

On-Site Sources

Prior to the installation of the clay cap at the site the release of volatiles from on-site groundwater and soils was a primary concern The placement of the clay cap is believed to have minimized the release of voes from these media However the initial inventory of potential receptors identified the ventin~ systems under the cap as a secondary source of release into the atmosphere

The results of GZA s weekly air vent monitoring have indicated widely varying levels of voes directly at vent openings both before and after the installation of carbon filters However at small distances from the vents Cl to 5 feet) the H-Nu readings have consistently indicated no significant levels of voes Based on these observations GZA suggests that volatiles emanating from cap vents do not at this time appear to pose a significant threat to air quality or human health Inasmuch as the vents are not essential to the caps function however GZA has proposed that they be sealed thereby eliminating this possible exposure route

Remedial Activities

Remedial activities at the Silresim site such as groundwater treatment soil excavatiomiddotn or regrading of the clay cap may generate volatiles and particulates that are released

37

I CiZ I

I I into the atmosphere The most likely receptors of emissions from

these activities would be the workers involved in the remediation Residents and workers in the surrounding area could also be

I potential receptors

626 Listing of Potential Receptors

I I Table 2 presents a summary list of pathways and potential

receptors identified to date for the Silresim site ~ f inal 1 i st of potential receptors will be developed during the course of the RI subsequent to the completion of Phase Two Sampling Program

I 700 REMEDIAL TECHNOLOGIES

I ~t this stage of middotthe RI study various remedial technologies have

I been identified which may be applicable to the Silresim site Using the preliminary data available GZA has compiled a list of the alternative technologies currently under consideration

The list attached as Table 3 includes technologies which address contaminant source control contaminant migration management as well as institutional and infrastructural considerations Specific technologies are listed for the following areas of concern

bull Air Emissions middot Surface Waters ~ Soils and Sediments bull Groundwater bull WaterSewer Lines

It should be noted that this is a preliminary list of technologies which may be appropriate at the Silresim site the list will be further refined upon completion 0pound the RI A detailed evaluation of the various technologies and development of remedial alternatives will be provided in the feasibility study document

I 800 UPDATES TO PROJECT OPERATION PLANS

I I The Project Operation Plans previously submitted in Deliverable 1

will be sufficient to describe the majority of themiddot Phase Two sampling tasks outlined in the previous sections Updates to the Project Operation Plans necessary at this time include

I 38

I I GZ

I I mo d i f i ca t i on o f t he 1 i s t o f p r o pe r t y a c c e ss c on t a c t s an d

I presentation of a standard operating procedure for sewer sampling Table lB of the Off-Site Management Plan will be updated to include the following property owners as access contacts for possible Phase Two monitoring well

I Albert J Petren Trustee Lucien J Petren Trustee Petren Brothers Realty Trust 115 Congress Street

I Lowell Massachusetts 01852

installations

Richard Proctor 216 Butman Road Lowell Massachusetts 01852

I Standard operating procedures for the proposed sewer sampling program wi11 be developed and incorporated into GZAs Project Operation Plans upon finalization of the work plan for the proposed sewer study

I I 1 1 I I I

I I

39

I

I G1 I

I I I

GZ I I

~ I m rshy

m en

I I I I I I I I I I I I I

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

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I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

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~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

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51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

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SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

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NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I I I I I I I

I I I I I I

observed riding motorbikes along the beds of the railroad tracks In addition joggers have been seen running along these tracks Exposure could potentially occur through the inhalation of vapors and generated dust

In addition plants growing in these soils could absorb compounds from soils The ingestion of vegetables grown in nearby gardens could be a potential route o~ exposure The burning of vegetation could release volatiles and semi-volatiles into the atmosphere

6 25 Air

As described in the previous sections volatile organic compounds may be released into the atmosphere from off-site groundwater surface water and soils Potential exposure through the inhalation of vapors could theoretically occur to nearby residents and workers Metals and semi-volatiles may be absorbed on suspended particulate matter Inhalation of the respirable particulate fraction may contribute to exposure

On-Site Sources

Prior to the installation of the clay cap at the site the release of volatiles from on-site groundwater and soils was a primary concern The placement of the clay cap is believed to have minimized the release of voes from these media However the initial inventory of potential receptors identified the ventin~ systems under the cap as a secondary source of release into the atmosphere

The results of GZA s weekly air vent monitoring have indicated widely varying levels of voes directly at vent openings both before and after the installation of carbon filters However at small distances from the vents Cl to 5 feet) the H-Nu readings have consistently indicated no significant levels of voes Based on these observations GZA suggests that volatiles emanating from cap vents do not at this time appear to pose a significant threat to air quality or human health Inasmuch as the vents are not essential to the caps function however GZA has proposed that they be sealed thereby eliminating this possible exposure route

Remedial Activities

Remedial activities at the Silresim site such as groundwater treatment soil excavatiomiddotn or regrading of the clay cap may generate volatiles and particulates that are released

37

I CiZ I

I I into the atmosphere The most likely receptors of emissions from

these activities would be the workers involved in the remediation Residents and workers in the surrounding area could also be

I potential receptors

626 Listing of Potential Receptors

I I Table 2 presents a summary list of pathways and potential

receptors identified to date for the Silresim site ~ f inal 1 i st of potential receptors will be developed during the course of the RI subsequent to the completion of Phase Two Sampling Program

I 700 REMEDIAL TECHNOLOGIES

I ~t this stage of middotthe RI study various remedial technologies have

I been identified which may be applicable to the Silresim site Using the preliminary data available GZA has compiled a list of the alternative technologies currently under consideration

The list attached as Table 3 includes technologies which address contaminant source control contaminant migration management as well as institutional and infrastructural considerations Specific technologies are listed for the following areas of concern

bull Air Emissions middot Surface Waters ~ Soils and Sediments bull Groundwater bull WaterSewer Lines

It should be noted that this is a preliminary list of technologies which may be appropriate at the Silresim site the list will be further refined upon completion 0pound the RI A detailed evaluation of the various technologies and development of remedial alternatives will be provided in the feasibility study document

I 800 UPDATES TO PROJECT OPERATION PLANS

I I The Project Operation Plans previously submitted in Deliverable 1

will be sufficient to describe the majority of themiddot Phase Two sampling tasks outlined in the previous sections Updates to the Project Operation Plans necessary at this time include

I 38

I I GZ

I I mo d i f i ca t i on o f t he 1 i s t o f p r o pe r t y a c c e ss c on t a c t s an d

I presentation of a standard operating procedure for sewer sampling Table lB of the Off-Site Management Plan will be updated to include the following property owners as access contacts for possible Phase Two monitoring well

I Albert J Petren Trustee Lucien J Petren Trustee Petren Brothers Realty Trust 115 Congress Street

I Lowell Massachusetts 01852

installations

Richard Proctor 216 Butman Road Lowell Massachusetts 01852

I Standard operating procedures for the proposed sewer sampling program wi11 be developed and incorporated into GZAs Project Operation Plans upon finalization of the work plan for the proposed sewer study

I I 1 1 I I I

I I

39

I

I G1 I

I I I

GZ I I

~ I m rshy

m en

I I I I I I I I I I I I I

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I into the atmosphere The most likely receptors of emissions from

these activities would be the workers involved in the remediation Residents and workers in the surrounding area could also be

I potential receptors

626 Listing of Potential Receptors

I I Table 2 presents a summary list of pathways and potential

receptors identified to date for the Silresim site ~ f inal 1 i st of potential receptors will be developed during the course of the RI subsequent to the completion of Phase Two Sampling Program

I 700 REMEDIAL TECHNOLOGIES

I ~t this stage of middotthe RI study various remedial technologies have

I been identified which may be applicable to the Silresim site Using the preliminary data available GZA has compiled a list of the alternative technologies currently under consideration

The list attached as Table 3 includes technologies which address contaminant source control contaminant migration management as well as institutional and infrastructural considerations Specific technologies are listed for the following areas of concern

bull Air Emissions middot Surface Waters ~ Soils and Sediments bull Groundwater bull WaterSewer Lines

It should be noted that this is a preliminary list of technologies which may be appropriate at the Silresim site the list will be further refined upon completion 0pound the RI A detailed evaluation of the various technologies and development of remedial alternatives will be provided in the feasibility study document

I 800 UPDATES TO PROJECT OPERATION PLANS

I I The Project Operation Plans previously submitted in Deliverable 1

will be sufficient to describe the majority of themiddot Phase Two sampling tasks outlined in the previous sections Updates to the Project Operation Plans necessary at this time include

I 38

I I GZ

I I mo d i f i ca t i on o f t he 1 i s t o f p r o pe r t y a c c e ss c on t a c t s an d

I presentation of a standard operating procedure for sewer sampling Table lB of the Off-Site Management Plan will be updated to include the following property owners as access contacts for possible Phase Two monitoring well

I Albert J Petren Trustee Lucien J Petren Trustee Petren Brothers Realty Trust 115 Congress Street

I Lowell Massachusetts 01852

installations

Richard Proctor 216 Butman Road Lowell Massachusetts 01852

I Standard operating procedures for the proposed sewer sampling program wi11 be developed and incorporated into GZAs Project Operation Plans upon finalization of the work plan for the proposed sewer study

I I 1 1 I I I

I I

39

I

I G1 I

I I I

GZ I I

~ I m rshy

m en

I I I I I I I I I I I I I

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I mo d i f i ca t i on o f t he 1 i s t o f p r o pe r t y a c c e ss c on t a c t s an d

I presentation of a standard operating procedure for sewer sampling Table lB of the Off-Site Management Plan will be updated to include the following property owners as access contacts for possible Phase Two monitoring well

I Albert J Petren Trustee Lucien J Petren Trustee Petren Brothers Realty Trust 115 Congress Street

I Lowell Massachusetts 01852

installations

Richard Proctor 216 Butman Road Lowell Massachusetts 01852

I Standard operating procedures for the proposed sewer sampling program wi11 be developed and incorporated into GZAs Project Operation Plans upon finalization of the work plan for the proposed sewer study

I I 1 1 I I I

I I

39

I

I G1 I

I I I

GZ I I

~ I m rshy

m en

I I I I I I I I I I I I I

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I

GZ I I

~ I m rshy

m en

I I I I I I I I I I I I I

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I I I I I I I I middotI I I I I I I

TABLES

I

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I TABLE 1

COMPARISON OF voe vs EXTRACTABLE COMPOUND

I CONCENTRATIONS IN GROUNDWATER

I Sampled Total Total (Extractables Well No by voes Extractables vs voesgt

I MW-lOlA NUS 353000 6884 2 MW-101A GZA 376450 5608 15

I MW--lOlB NUS 362000 3904 1

1 MW-102A NUS ND ND MW-102A GZA 38 ND lt1

MW--102B NUS 253000 2430 lt1 MW-102B GZA 2 194 795 1781 lt1

I Mw-104 NUS ND ND

I MW-105A NUS 550 35 6 MW-105A GZA gt535020 49 lt1

MW-105B NUS 335 24 7

I middot 6MW-105B GZA 453 27

MW-106A NUS 15 ND lt1

I MW-106B NUS 1495 ND lt1

I Notes

1 NUS samples collected May 2 1983 and analyzed through EPA

I Contract Laboratory Program

I 2 GZA samples collected December 4 1985 and analyzed by Roy F

Weston Inc

3 ND - None Detected

I I I I I

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I

I I

TABLEmiddot 2

Inventory of middotPotential Receptors

lOtential lOtential Exposure Routes Tran~rt Media Release Mechanism ~sure Point lOtential Rece12tor Secondary~ IGroundwater Primary Groundwater Supply Wells Residences Ingestion Direct Contact

FlCM Robinson St Inhalation Industrial Areas Ingestion Direct Contact Lowell Iron amp Inhalation Steel Lowell Used Auto I Parts JaR2S Bond Auto Sales B amp t Used Auto Parts I Walbert Plastics Union Sheet Metal

FUture Drinking Water Source Ingestion Ivolatilization Basement Residences Inhalation Direct Contact

Seepage Industrial Areas Inhalation Direct Contact

Secondary Groundwater Supply Wells Residences Ingestion Direct Contact IFlCM Canada St Inhalation Maple St Main St Cottage Place

Industrial Area Ingeston Direct Contact Arrow carrier Inhalation I

Basement Residences Inhalation Direct Contact Seepage Industrial Area Inhalation Direct Contact

Surface Waters Groundwater Discharge River Meadow Brook I

Stream Flow Recreational Hullans Direct Contact Inhalation Activities Ingestion Concord River Residents of Ingestion Direct Contact Merrimack River Lawrence and Inhalation

Metheun I Wildlife Ingestion Direct Contact Plants Direct Contact

Unnamed Pond IiRecreational Hullans Direct Contact Inhalation llctivities Ingestion

Wildlife Ingestion Direct Contact Plants Direct Contact I

Sewer tines Groundwater Discharge Seoer tines Duck Island Manholes Treatment

Plant-Merrimack River Ingestion Direct Contact

Inhalation IResidences Inhalation Industrial Areas Inhalation

Soils Groundwater seepage Off-site soils Surface Runoff Playing Residences Direct Contact Inhalation IGardening Ingestion Direct Contact

Burning Inhalation Vegetation

Industrial Areas Direct Contact Inhalation Wildlife Direct Contact Inhalation

Ingestion I Air Volatilization Venting System Residences Inhalation

Under Clay cap Industrial Areas

Rerreiial I Activities

Volatilization Groundwater Treatnent Workers Inhalation

Volatilization and Soil Excavation Residences Dust Generation Clay cap Repair Industrial Areas I

I

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I TABLE 3

PRELIMINARY LIST OF REMEDIAL TECHNOLOGIES

1 Air Emissions middotVapor Barriers (Capping) bullVenting

I bullGas Collection amp Treatment -Activated Carbon -Incineration ~Thermal Oxidation

I -Miscellaneous

I 2 Surface Waters

-Diversion -Dikes Berms Levees sedimentation Basins

I -Regrading -RevegetationcollectionTreatment surface Seals (Capping)

I -In-situ Treatment

I -Aeration Enhancement -Permeable Treatment Beds -Miscellaneous

3 Contaminated SoilsSediments bullDredgingExcavationI bullEncapsulationbullLandfilling-Regrading bullRevegetationI solidificationFixation -In-situ Treatment (vitrification vapor extractionI biodegradation aeration solvent flushing)

-Treatment (incineration

I biological aeration flushing) surface Seals (Capping)

I I I

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I TABLE 3 (CONTD)

I 4 Groundwater

bullPhysical BarriersI -Cut-off Walls (slurry trenches sheet piling grout curtains block displacement)

I -Surface Seals (Capping) -Regrading

bullGroundwater Manipulation-Upgradient diversion -Hydrodynamic Isolation -Plume Diversion

bullGroundwatemiddotr Interception and Treatment

I (wells trenches drains aeration carbon adsorption biological etc)

-In-situ Treatment -Permeable Treatment Beds -BiologicalChemical

5 Contaminated WaterSewer LinesI -ReplacementRelocation -Grouting

I bullPipe Repair (relining sleeving)

6 InstitutionalInfrastructural -No Action

I bullMonitoring Only bullLand Use Restrictions bullRelocation

I I I I I I I I

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I

TABLE 4

TARGET COMPOUNDS FOR SILRESIM VENT SAMPLING

I I acetone 2-hexanone

benzene methyl chloroform

12-dichloropropane methylene chloride

I carbon tetrachloride 4-methyl-2-pentanone

chlorobenzene perchloroethylene

middotChloroform 1122-tetrachloroshyethane

I 11-dicloroethane toluene

12-dichloroethane 112-trichloroethane

I 11-dichloroethylene trichloroethylene

I 12-dichloroethylene (trans) xylenes

ethyl benzene

I I I I I I I I I

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I GZ I I I I I I I I I I I I

C) C D m

I u

I I I I

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I I 1 I I I I FIGURES

I I I I I I I I I

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

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I

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I

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I I I

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I I

I II

I J I I

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I

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I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

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1

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I

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0

0 ~

I

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j

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I I I

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I I

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I

N i)1ljamp~(~W1

I

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od

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_______________________shy- 1_____________________________________

0g bull

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I ILi

dI

0 z 0 N

I

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ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

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I

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bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

----

I

-

- I o - - - I middot-middot middot 1 ~l ~

I ~ Ill Ill

I ~

I

II)

middotrtgt

bulli ~~~middotmiddot [J

---- - ___ -

middotmiddot - - J

--_

bull-- -JI----~~)ampl

middot----

8S

0

---middot

~

I I bull bull

I

bull t4 51

GD ~

~-

I~ r~~ DtD~-I -

-C5 aCiZ ra

I NOTES

N I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN

I FEB 1985

2) THE SAMPLING LJCATJONS WERE APPROXIMATELY

I DETERMINED BY tAPE MEASUREMENTS ANO LINE OF SIGHT FROM EXISTING FEATURES THESE DATA SHOULD BE CONSIDERED ACCURATE ONLY TO THE

bull DEGREE IMPLIED BY THE METHOD USED

LEGEND

I t) SURFACE WATER SAMPLING STATION (GZA 1986)

SURFACE WATER ANO SEDIMENT SAMPLING STAttONI bull

(GZA 1986)

I bull SURFI CIAL SOIL SAMPLING STATlail FOR PRIORITY POLLUTANT ANALYSIS (GZA 1986) SS-3 THROUGH SS-5 ANALYZED FOR PCB

1 S ONLY middot

SURFACIAL SOIL SAMPLING STATION SELECTED FOR G C SCREENING ANALYSIS (APPROXIMATE LOCATIONshyGZA 1986)

__---1 ~111~_- SOIL SAMPLING LOCATION (NUS 1983)

fLLi

f A-middot middot

~ AREA OF GZA SURFICIAL SOIL SCREENING (TOTAL VO C) c GRID INTERSECTION POINTS DELINEATE SOIL SCREENING

LOCATIONS

middot middot ~INDICATES SAMPLE SELECTEDmiddot FOR GC SCREENING ANALYSIS

PROPOSED PRIORITY POLLUTANT SAMPLES

X PROPOSED METALS SAMPLES

APPROXIMATE LOCATION OF AREAS COVERED BY CRUSHED STONE ~ ~middot-

PO~O

~middot

)) ~

51

0 100 200 400deg

REMEDIAL INVESTIGATION

SILRESIM SITE LOWELL MA

_I

SURFICIAL SOIL SAMPLING LOCATIONS

FIGURE No I middot JUNE 1986

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

bull

I I

I I

_

I I

I

I I

I I

- shy

-shybullOdegI

I I ~amp0

I

- --shy

I I

AUTO SALVAGE YARD

I

I

I

I

I I

I

I

I _

I I I I I I I I

I I I I I I I

I I o

- shy

I

I

I

( I I

I

I

--

I

shy - -bull

I

I I

I I

-shy ~ bull I I ____

--- )- _

I

I I

I I I

I I I-~

p

I I

I I

I II

I J I I

_ I I I I

I I f I

- I

I I

I

t~~ y

I ~ I 7-50 I

I - -I ---middotSTEEL FRAME

STRUCTURE

I

I I I

b

I

I i i

Ibull I

1

I1

I

_ ~ I_ Q

0

0 ~

I

- I I I I

j

J

I I

I I I

bullmiddot

I I

-

I

N i)1ljamp~(~W1

I

I

I I

od

- I I

I I I I _

I I

I

I

I

I

I I

I

---shy ~ _

I

I

I I

I

i ~ 1

I

_______________________shy- 1_____________________________________

0g bull

II)

I ILi

dI

0 z 0 N

I

~ ILi CD 0 J 0 c

ID CX) a-

23 i

bull

0 ~ I

lt(

bull0 z

LaI _J-LL

bull

-middot-~-middot

middot-- ~middotmiddot

)

I

I

- ~

I

I I I

bull(~ JI

I

I 1

I

I I o

I I I I I

I __ I

j I Ii I)

NOTES

I) BASE MAP DEVELOPED FROM PLIIN PROVIDED BY NUS CORPORATION ENTITLEDSILRESIM CHEMICAL CORPORATION LOWELL MASSACHUSETTS TANK AND BUILDING DISMANTLING DATED JUNE 1 1f02 ORIGINAL S~ALE lu = 50 1 DWG No 0726-01-2 A I

AND ROAD LOCAT ION PLAN middot

2 DETAILED LOCATIONS OF BURIED OBJECTS ARE BASED ON INFORMATION PROVIDED IN THE NUS MAGNETOMETER SURVEY REPORT FEBRUARY 10 1984

3) middot FENCE LOCATION IN NORTHWEST SECTION OF SITE WAS ESTIMATED BY MEASUREMENTS FROM GZA GRID STAKED IN FIELD

I

4) THE PERKINS-JORDAN METAL bETECTION SURVEY WAS CONDUCTED NOVEMBER 1981 USING A SCHOMSTEDT MODEL 6A-32 MAGNETIC LOCATOR SURVEY WAS MADE OVER 50 FOOT SQUARE GRID LINES

I 5) THE GZA METAL DETECTION SU~VEY WAS CONDUCTED USING A GARRETT ADS II DETECTOR WITH DM5

DEEP SCAN COILS THE INSTRUMENT WAS PASSED OVER THE GZA EAST-WEST GRID LINES 500 TO 840 AND THROUGH 50 FOOT LINES CENTERED AT THE NUS BURIED OBJECTS BQjI THRU BOl9

LEGEND

ltmiddot ~ _bull

middot~

X ---DETAILED LOCATION OF BURIED METAL OBJECT($) ~ _

r 1 I

o 25 so 100 150 200 I

bull

I

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY PERKINS-JORDAN NOV 19BI

METAL DETECTOR SURVEY HIGH READINGS SURVEY PERFORMED BY GZA MARCH 12 1986

KNOWN BURIED FERROUS MATTER FROM NUS MAGNETOMETER SURVEY FEl10 1984 FIGURE 6

BURIED CONCRETE SLABS OR DEBRIS FROM COMNUS FILES I

BURIED PIPES

OVERHEAD POWER LINES

BURIED METAL OBJECT LOCATION FROM GEOPHYSICAL ANOMALY middot middotmiddot middot bull middot

I THRU9 FROMNUS MAGNETOMETEREM SURVEY CONDUCTED NOV 1983 middot 10 THRU 13 FROM SA ALSUP MAGNETOMETEREM I SURVEY CONDUCTED MARCH 1986

bull I o 1 d I I bull 1middot I

SILRESIM RIFS GEOPHYSICAu SURVEYBURIED METAL OBJECTS PLAN

_________________ L_O_W_E_L_L__M_A_S_S__middot________J_U_N_E__1_98_6_middot-middot-----------------------F_IG_U_R_E---No2J

I Ibull

ii

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

1

I I I I I I I 1

I I

I

I I

middot__ ~MW_-204 ~

I I - -

I I I

I I

bull I

_ _ middot j J- -~

--

M 6

NOTE

I) BASE MAP FROM PLATE I OF CDM RI FS WORK PLAN FEB 1985 LAND SURFACE ELEVATIONS WERE ADJUSTED BY GZA FROM CITY OF LOWELL DATUM TO MEAN SEA LEVEL DATUM CORRECTION FACTOR USED = t 55

N 2) THE LOCATION AND ELEVATION OF THE MONITORING WELLS WERE DETERMINED BY STADIA SURVEY BY DANA F PERKINS a ASSOC INC (APRIL 1986) THESE DATA SHOULD BE CONSOERED ACOJRmE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED

MULTI - LEVEL GROUNDWATER MONITORING WELL0 INSTALLED BY GZA

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZA middot

+ - )

MULTI-LEVELmiddot GROUNDWATER MONITOR ING WELL INSTALLED ev PERKINS JORDAN INC

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTAL_EO BY PERKINS JORDAN INC

+ SINGLE- LEVEL GROUNDWATER MONITORtNG WELL -_ INSTALLED BY OTHERS - middot

Mli - - bull _ - SEWER MANHOLES ( APPROXIMATE LOCATION BASED ON shy

INFORMATION OBTAINED FROM CITY CF LOWELL)

+ PROPOSED MONITORING WELL

+ PROPOSED PIEZOMETER

0 I(() 200 4001

I ~ u 0 en

I cn bull

rt)

I 0

v IC)

0

I 0 z

I ~1

I OZ

I ~9 _ -

-~~03

_

~W-101

f ~W-303

+MW-302 J__

~

~

~04

MW-30~( - copy bull I J

------shy

- ------middotshy - -shy - shy

- shy B-4 - _ ~

- shy

REMEDIAL INVESTIGATION PROPOSED WELL PIEZOMETER LOCATIONS SILRESIM SITE

LOWELL MA JUNE1986 FIGURE No 3

middotbullo~

~~~o I

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I I I I I I I I I I I I I

v ll)

0 v

I

I lt

0 2

UJ J

I u

0 1000 2000 40001

FROM USGS LOWELL MASS- NH 1966AND BILLERICA MASS 1965 QUADRANGLE MAPS

GZ REMEDIAL INVESTIGATION

SILRESIM SITE

LOWELL MA

STUDY REGION FOR GROUNDWATER

MODEL AUGUST 1986 FIGURE N04 I

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I middot )gt

-c -c m z

I I CiZ

shyCJ

X

I )gt

I I I I I I I I I I I I I I I

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I I I I I I I I I I I I I I Imiddot I

APPENDIX A

PRELIMINARY SEWER SAMPLING RESULTS

I

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I

SAMPLE IDENTIFICATION - SEWER SAMPLING JUNE 27 1986

I I Sample ID Sample Location

Field Bland 0070 Field Blank SRSSW04001 Manhole MH-4 (84)

I SRSSW06002 Mannole MH-6 (84)

I SRSSW05003 Manhole MH-5 ( 72 II )

SRSSW02005 Manhole MH-2 (Tanner St) SRSSW07004 Manhole MH-7 (Tanner St)

I SRSSW06006 Replicate of MH-2 SRSSW06006 (RPCDP) Replicate of MH-2 SRSSW04001 (OOlOMS) Matrix Spike of MH-4

I I I I I I I I I I I I

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I WESTON Analytics

GZA VOA Is

I RFWBN 8606-273 W0 2431-02-01-0l

I 1 The following qualifiers are used on the data summary

I U - Indicates that the compound was analyzed for but not detected The minimum detection limit for the sample (not the method detection limit) is reported with the U (eg lOU)

I J - Indicates an estimated value This flag is used either when estimating a concentration for tentatively identified compounds where a 1 1 response is assumed or when the mass

I spectral data indicate the presence of a compound that meets

I the identification criteria but the result is less than the specified detection limit but greater than zero (eg lOJ) If limit of detection 10 ug1 and a concentration of 3 ug1 is calculated it is reported as 3J

I BS - Indicates blank spike in which reagent grade water is spiked with the CLP matrix spiking solutions and carried through all the steps in the method Spike recoveries are reported

I BSD - Indicates blanmiddotk spike duplicate

I DL - Indicates that surrogate recoveries were not obtained because the extract had to be diluted for analysis

I NA - Not applicable

DF - Dilution factor

I NR - Not required

I 2 Sample Collected 62786

Sample Analyzed 6307186

I 3 Dimethyl sulfide quantities were estimated by comparing the

area of other parent ion ( 62) to the nearest internal

Manager WESTON Analytical Laboratories

d

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

WESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS

- - - - middot- - - - - - - - - - - - - -middot shy====middotmiddot=== middot============================================================================================= RFW Batch Number 8606-273- Client GZA SILRESIN f middot-f fitr-G Page 1----------------------------------------------------------------il-------------~----------------------shy

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 sample RFW WBK 0070 0010 0020 0030 0050 Information Matrix Water Water Water Water Water Water

D F 1 1 1 1 1 10 Units ug1 ug1 ug1 ug1 ug1 ug1

---------------------------------------------------------------------------------------------middot -------shySurrogate Toluene-de Recovery Bromofluorobenzene

() l2-Dichloroethane-d4 ============ =====-middot== middot= = = = ==== Chloromethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Bromomethane bullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbull Vinyl Chloride Chloroethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbullbullbullbullbullbull Methylene Chl_oride Acetone e bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull

Carbon Disulf ide 11-Dichloroethene bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 11-Dichloroethane bullbullbullbullbullbullbullbullbullbullbullbullbull Trans-12-Dichloroethene bullbullbullbullbullbullbullbullbullbullbull Chloroform 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Butanone bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 1 1 1-Trichloroethanebullbullbullbullbullbullbullbullbullbull Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbullbullbull Vinyl Acetat-e bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull Brornodichloromethane bullbullbullbullbullbullbullbullbullbull ~ bullbullbullbull 1 2-Dichloropropane bullbullbullbullbullbullbullbullbull Trans-13-Dichloropropene bullbullbullbullbullbullbullbull Trichloroethene bullbullbullbullbullbullbullbull Dibromochloromethane bullbullbullmiddotbullbullbullbullbullbullbullbullbullbullbull 112-Trichloroethanebullbullbullbullbullbullbullbullbullbull Benzene bullbullbull _bullbull cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 2-Chloroethylvinylether bullbullbullbullbullbullbullbull Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 4-Methyl-2-pentanone bullbullbullbullbullbullbullbullbullbullbullbullbullbull 2-Hexanone bullbullbull

85 84 92 91 94 90 87 82 90 91 94 90 99 85 86 87 84 90

=========fl ===== ==fl= = ==fl=========fi=========fl=========fl 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

8 J 28 22 24 15 300 10 u 20 10 u 10 u 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 2 J 2 J 10 u 23 J 10 u 10 u 3 J 2 J 10 u 420 10 u 10 u 5 J 4 J 5 J 23 J 10 u 10 u 10 u 10 u 10 u 45 J

8 J 4 J 2 j 10 u 10 u 100 u 10 u 10 u 33 35 8 J 490 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 23 17 10 u 210 10 u 10 u 10 u 10 u 10 u 100 u 10 U 10 u 10 u 10 u 10 u 100 u 10 u 10 u lo u 10 u 10 u 14 J 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u 10 u 10 u 10 u 10 u 10 u 100 u

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

- - - - - - 1111 - - - - - - - - - - -middot shyRFW Batch Number 8606-273- Client GZA SILRESIN Page i

cust ID LAB BLANK FIELD BLNK SRSSW04001 SRSSW06002 SRSSW05003 SRSSW02005 RFW 273 BLANK 0070 0010 0020 0030 0050

=========== middot= middot====middot == middot ====== ============fl=========fl=========fl==--===-middot=fl middotmiddot=======fl=========fl Tetrachloroethene 10 U 10 U 7 J 5 J 10 U middot 15 J 1122-Tetrachloroethane 10 U 10 U 10 U 10 u 10 U 100 U Toluene 10 U 10 U 10 U 10 U 10 u 14 J Chlorobenzenemiddot bull ~ bull ~ 10 U 10 u 10 U 10 u 10 U 33 J Ethylbenzene 10 U 10 U 10 U 10 U 10 U 100 U Styrene bullbullbullbullbullbullbullbullbullbullbull ~ 10 U 10 U 10 U 10 U 10 U 100 U Total Xylenes 10 U 10 U 10 U 10 U 10 U 100 U Dichlorobenzenes 10 U 10 U 10 U 10 U 1 J 100 U Trichlorofluoromethane 10 U 10 U 1 J 1 J 1 J 100 U

Others Dimethyl sulfide bullbullbull 10 U 10 U 10 U 10 U 10 U 100 U Tetrahydrofuran bullbullbullbull 10 U 10 U 10 U 10 U 10 U 100 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Pre~ent at less than detection limit NR=Not requested

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

------------------------------------------------------------------------------------------------------

------------------ shyWESTON ANALYTICS GCMS DATA SUMMARY

VOLATILE HAZARDOUS SUBSTANCE LIST COMPOUNDS -----------------==---========- == - == == -==== == --=== == -------------===----====--======------shyRFW Batch Number 8606-273 Client GZA SILRESIN Page 2

cust ID SRSSW06006 SRSSW06006 SRSSW07004 SRSSW04001 Sample RFW 0060 0060RPLDP 0040 OOlOMS Information Matrix Water Water water Water

D F 1 2 1 1 Units ug1 ug1 ug1 ug1

--- --------------------------- ------- - ------ ---------- -------------~----------------------shysurrogate Toluene-dB

94 98 101 99 Recovery Brornofluorobenzene 95 100 101 100

() l2-Dichloroethane-d4 93 88 93 86 === -======================== middot - ====== =fl=-===middot == fl==== - = fl=========fl=========fl=========fJ Chlorornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Brornornethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Chloride 3 J 3 J 10 u 10 u Chloroethane bullbullbullbullbullbullbullbullbullbullbullbullbullbullbull ~ bullbull 2 J 20 u 10 u 10 u Methylene Cmiddothloride 130 140 17 29 Acetone bullbullbullbullbullbullbull 5 J 15 J 3 J 10 u Carbon Disulfide bullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 11-Dichloroethenebullbullbullbullbullbullbullbullbull 3 J 3 J 10 u 84 11-Dichloroethanebullbullbullbullbullbullbullbullbullbull 12 12 J 3 J 2 J

Trans-12-oichloroethene bullbullbullbullbull 100 100 3 J 3 J Chlorofarm ~ 15 16 J 10 6 J 12-Dichloroethanebullbullbullbullbullbullbullbullbullbullbullbull 35 36 10 u 10 u 2-Butanone bull 10 u 20 u 10 u 3 J 111Trichloroethanebullbullbullbullbull 400 350 8 J 36 Carbon Tetrachloride bullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Vinyl Acetate 10 u 20 u 10 u 10 u Bromodichlorornethane bullbullbullbullbullbullbullbullbullbullbull ~ 10 u 20 u 10 u 10 u 12-Dichloropropane bullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Trans-13-0ichloropropene bullbullbullbullbull 10 u 20 u 10 u 10 u Trichloroethene bullbullbullbullbullbullbullbull 480 450 12 118 Dibrornochlorornethane bullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 112-Trichloroethanebullbullbullbullbullbullbullbull 2 J 2 J 10 u 10 u Benzene bull bullbull 9 J 10 J 10 u 86 cis-13-Dichloropropene bullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Chloroethylvinylether bullbullbullbullbullbullbull 10 u 20 u 10 u 10 u Bromoform bull bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull 10 u 20 u 10 u 10 u 4-Methyl-2-pentanone bullbullbullbullbullbull 10 u 20 u 10 u 10 u 2-Hexanone 10 u 20 u 10 u 10 u

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

------------------------------------------------------------------------------------------------------ =- - -==== ==================================================- - - - - - - - -=================-middot =- - - ===middot- =============middot - shy

RFW Batch Number 8606-273 Client GZA SILRESIN Page 2 - -

Cust ID SRSSW06006 SRSSW06006 SRSSW07004 SR5SW0400l RFW 0060 0060RPLDP 0040 OOlOMS

======================================= ====middot fl==-== middot - middot f 1 = =====f1=========fl=========f 1========= f Tetrachloroethene 92 95 8 J 8 J 1122-Tetrachloroethane 10 U 20 U 10 U 10 U Toluene bull 11 11 J 10 u 108 Chlorobenzene 23 25 10 U 108 Ethylbenzene 10 U 20 U 10 U 10 U Styrene 10 U 20 U 10 U 10 U Total Xylenes 10 U 20 U 10 U lO U Dichlorobenzenes 6 J 6 J 2 J 10 u Trichlorofluoromethane 2 J 20 u 1 J 1 J

others Dimethyl sulfide bullbullbullbull 9 J 9 J 10 U 10 U Tetrahydrofuran bullbull 10 U 10 U 10 U 10 U

U=Analyzed not detected B=Present in blank NRP=Not Reported J=Present at less than detection limit NR=Not requested

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

DATE OF REPORT 30 July 1986

I I I DATA SUMMARY FOR

R F W NO

I SAMPLE DESCRIPTION

I I I COMPOUND NAME

C4-olefins

I Oxygenated compounds

I I -fshy

I I I I I I I I

GZA

8606-273-0020

SRS-SW-06--002

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ugL

233 13

414 110

I

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I I I DATA SUMMARY FOR

R F W NO shy

I SAMPLE DESCRIPTION

I I

I COMPOUND NAME

O~TE OF REPORT 30 July 1986

GZA

8606-273-0010

SRS-SW-04-001

TENTATIVELY 1DENT1fIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION ~gL

C4-olefins 232 14

I Oxygenated compound 413 120

I I I I I I I I I I I

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

I D~TE OF REPORT 30 July 1986

I

I DATA SUMMARY FOR

R FW NO

I SAMPLE DESCRIPTION

middot1

I I COMPOUND NAME

C7-aldehydeI Imiddot I I I I_

I I I I I

GZA

8606-273-0070

Field Blank

TENTATIVELY IDENTIFIED COMPOUNDS (VOA FRACTION)

SCAN NUMBER ESTIMATED CONCENTRATION iigL

670 11

I

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~

- - -- - -middot-MIi middot~ Oil

WN~ibull ~lJt

SfrHf (110~ ~hc~ltl)

UZ

- shy

r- _

- - - shy

bullbull -

__ ~

- shy

bullbullmiddotbull

--------------middot--middot shy1 REMEDIAL

~ _ F _middot ~ 1 r~

A[

NOTE

I) BASE MAP FROM PLATE I OF COM RIFS WORK PLAN FEB I Ii a LANO SURFACE ELEVATIONS WERE ADJUSTED BY GZA FR( CIT1 OF LOWEU DATUM TO MEAN SEA LEVEL DATUM CORRECOON FACTOR USED bull i 55

21 THE lDCATION ANO ELEVATION Of THE MONITORING WELLS WERE OETERMNED BY STADA SURVEY BY DANA F PERKINS 8 ASSOC INC (_APRIL 1986) THESE DATA SHOlLD BE CONSURED ACCUR4Jl OKY TO TliEmiddot DEGREE IMPLIED Bl THE METHOO USED

LEGEND

MULTI - LEVEL GROUNDWATER MONITORING WHL 0 INSTALLED BY G Z A

SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY GZ A

MULTI-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY PERKldegNS JORDAN INC

bull+

SINGLE-LEVEL GROUNDVIATER MONITORING WELL INSTALLED BY PERKINS JORDAN INC

+ SINGLE-LEVEL GROUNDWATER MONITORING WELL INSTALLED BY OTHERS

bull bull ~-SEWER MANHOLES (-UPROXIMATE LOCATION BASED ON INFORMATION OBTAINEO FROM CITY a LOWElli

bull

-middot-shylMONITORING NELL LOCAT I Of PLAN

INVESTIGATIOIJ

middot T f

bullmiddot-middot J rr ~ _ ~ ~middot~