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11-12 30 TH DRIVE QUEENS, NEW YORK Remedial Investigation Report OER Project Number: 16EHAZ012Q Prepared for: 11-12 30 th Drive LLC 35-11 36 th Street, 3 rd Floor, Astoria, New York 11106 718.204.0814 [email protected] Prepared by: HarPar Engineering, P.C. 88 Deer Park Blvd, Dix Hills, NY 11746 631.241.0938 [email protected] SEPTEMBER 2015

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11-12 30TH DRIVE

QUEENS, NEW YORK

Remedial Investigation Report

OER Project Number: 16EHAZ012Q

Prepared for:

11-12 30th Drive LLC

35-11 36th Street, 3rd Floor,

Astoria, New York 11106

718.204.0814

[email protected]

Prepared by:

HarPar Engineering, P.C.

88 Deer Park Blvd, Dix Hills, NY 11746

631.241.0938

[email protected]

SEPTEMBER 2015

2

REMEDIAL INVESTIGATION REPORT

TABLE OF CONTENTS

FIGURES ................................................................................................................................. 3

LIST OF ACRONYMS ........................................................................................................... 6

CERTIFICATION ................................................................................................................... 7

EXECUTIVE SUMMARY ..................................................................................................... 8

REMEDIAL INVESTIGATION REPORT .......................................................................... 12

1.0 SITE BACKGROUND............................................................................................... 12

1.1 Site Location and Current Usage ............................................................................ 12

1.2 Proposed Redevelopment Plan ............................................................................... 12

1.3 Description of Surrounding Property ...................................................................... 12

2.0 SITE HISTORY ......................................................................................................... 14

2.1 Past Uses and Ownership ........................................................................................ 14

2.2 Previous Investigations ........................................................................................... 14

2.3 Site Inspection ......................................................................................................... 14

2.4 Areas of Concern .................................................................................................... 15

3.0 PROJECT MANAGEMENT ..................................................................................... 16

3.1 Project Organization ............................................................................................... 16

3.2 Health and Safety .................................................................................................... 16

3.3 Materials Management............................................................................................ 16

4.0 REMEDIAL INVESTIGATION ACTIVITIES ......................................................... 17

4.1 Geophysical Investigation ....................................................................................... 17

4.2 Borings and Monitoring Wells................................................................................ 17

4.3 Sample Collection and Chemical Analysis ............................................................. 19

5.0 ENVIRONMENTAL EVALUATION....................................................................... 23

5.1 Geological and Hydrogeological Conditions .......................................................... 23

5.2 Soil Chemistry ........................................................................................................ 24

5.3 Groundwater Chemistry .......................................................................................... 24

5.4 Soil Vapor Chemistry ............................................................................................. 25

5.5 Prior Activity .......................................................................................................... 25

5.6 Impediments to Remedial Action ........................................................................... 25

3

FIGURES

Figure 1 – Site Plan showing Sampling Locations

Figure 2 – Proposed Site Redevelopment

Figure 3 – NYC DCP Zoning Map

Figure 4 – Surrounding Land Usage

Figure 5 – Groundwater Level Elevations

4

TABLES

Table 1 – Volatile Organic Compounds – Soil

Table 2 – Semi-Volatile Organic Compounds – Soil

Table 3 – Pesticides/PCBs – Soil

Table 4 – Metals – Soil

Table 5 – Volatile Organic Compounds – Groundwater

Table 6 – Semi-Volatile Organic Compounds – Groundwater

Table 7 – Pesticides/PCBs – Groundwater

Table 8 – Metals – Groundwater

Table 9 – Volatile Organic Compounds (TO-15) – Soil Vapor

5

APPENDICES

Appendix A – Photographs

Appendix B – Soil Boring Logs

Appendix C – Laboratory Analytical Reports

Appendix D – Phase I ESA, dated February 4, 2014

Appendix E – Limited Phase II ESA, dated March 17, 2014

6

LIST OF ACRONYMS

Acronym Definition

AOC Area of Concern

CAMP Community Air Monitoring Plan

COC Contaminant of Concern

CPP Citizen Participation Plan

CSM Conceptual Site Model

DER-10 New York State Department of Environmental Conservation

Technical Guide 10

FID Flame Ionization Detector

GPS Global Positioning System

HASP Health and Safety Plan

HAZWOPER Hazardous Waste Operations and Emergency Response

IRM Interim Remedial Measure

NAPL Non-aqueous Phase Liquid

NYC VCP New York City Voluntary Cleanup Program

NYC DOHMH New York City Department of Health and Mental Hygiene

NYC OER New York City Office of Environmental Remediation

NYS DOH

ELAP

New York State Department of Health Environmental

Laboratory Accreditation Program

OSHA Occupational Safety and Health Administration

PID Photoionization Detector

QEP Qualified Environmental Professional

RI Remedial Investigation

RIR Remedial Investigation Report

SCO Soil Cleanup Objective

SPEED Searchable Property Environmental Electronic Database

7

CERTIFICATION

I, Hardik Parekh, P.E., am a Qualified Environmental Professional, as defined in RCNY §

43-1402(ar). I have primary direct responsibility for implementation of the Remedial

Investigation for the 11-12 30th Drive Site (NYC OER Project 16EHAZ012Q). I am responsible

for the content of this Remedial Investigation Report (RIR), have reviewed its contents and

certify that this RIR is accurate to the best of my knowledge and contains all available

environmental information and data regarding the property.

Qualified Environmental Professional Date Signature

8

EXECUTIVE SUMMARY

The Remedial Investigation Report (RIR) provides sufficient information for establishment

of remedial action objectives, evaluation of remedial action alternatives, and selection of a

remedy pursuant to RCNY§ 43-1407(f). The remedial investigation (RI) described in this

document is consistent with applicable guidance.

Site Location and Current Usage

The Site is located at 11-12 30th Drive in the Astoria section in Queens, New York and is

identified as Block 504 and New Lot 3 (previous lots 3 & 21, NYC DOB recently combined both

lots) on the New York City Tax Map. The Site is approximately 21,100-square feet and is

bounded by 30th Drive to the north, 31st Avenue to the south, 12th Street to the east, and Vernon

Boulevard to the west. A map of the site boundary is shown in Figure 1. Currently, the Site is

developed with two 1-story concrete block and brick buildings, a 1-story metal-constructed

storage building and associated concrete-paved parking lots. The Site is currently occupied by

The Bohea Associates NY, Ltd. (“Bohea”), an Asian food distribution company, and Titan

Media, an advertising display company.

Summary of Proposed Redevelopment Plan

The proposed future use of the Site will consist of two (2) residential buildings, totaling 711

apartments, including approximately 28,763 square foot courtyard. Layout of the proposed site

development is presented in Figure 2. The current zoning designation is R7A, R6B, a general

residential district. A brief R6B zoning guideline from the NYC DCP is attached as Figure 3.

The proposed use is consistent with existing zoning for the property.

The proposed development shall include two (2) residential buildings on the Site with a

footprint of approximately 70,102 square feet. The 1st building shall include a 9-story residential

building with two cellar levels and will have a total of 569 apartments. The cellars shall include

below grade parking and mechanical rooms. The 1st floor will comprise of common accessible

lobby and some recreation area for the residents. The street address for this building will be 30-

77 Vernon Boulevard, Astoria, NY 11102. The average depth of excavation shall be

approximately 15 feet below existing street grade.

The 2nd building shall comprise of a 6-story residential building with one cellar level and will

have a total of 142 affordable apartments. The cellar shall be used for parking and mechanical

9

rooms. The new address for this building shall be 30-80 12th Street, Astoria, NY 11102. The

average depth of excavation shall be approximately 15 feet below existing street grade.

The existing one-story building located on the southern portion of the Site (former Lot 3)

shall remain in place and will go through inside renovation. The existing building is

approximately 21,100 square feet. The total amount of soil expected to be removed for the

excavation is approximately 0 cubic yards.

Summary of Past Uses of Site and Areas of Concern

Prior to the construction of the existing improvements, previous Lot 3 was a vacant lot as of

at least 1898 to 1950 and previous Lot 21 was a vacant lot from at least 1915 to 1936. Prior to

that, previous Lot 21 contained two dwellings with two associated small sheds in at least

1898.The AOCs identified for this Site in a previous Phase I report prepared by IVI in 2014

include:

1. New York City Little “E” Designation – An “E” Designation was placed on the Subject

Property for Hazardous Materials (E-245).

2. The Subject Site was formerly occupied by Pop Displays Drive, which was listed as a

Conditionally Exempt Small Quantity Generator (CESQG) in 2006 and 2007. This

facility was also listed as a Small Quantity Generator (SQG) in 1999 and as a Large

Quantity Generator (LQG) in 1984.

3. Two inactive aboveground storage tanks (ASTs) were observed in the northwestern

section of the cellar of the building located on former Lot 21. The tanks were constructed

with steel and had capacities of 5,000-gallons and 275-gallons.

Summary of the Work Performed under the Remedial Investigation

1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e. structures,

buildings, etc.);

2. Installed six (6) soil borings across the entire project Site, and collected twelve (12) soil

samples for chemical analysis from the soil borings to evaluate soil quality;

3. Installed three (3) groundwater monitoring wells throughout the Site to establish

groundwater flow and collected three (3) groundwater samples for chemical analysis to

evaluate groundwater quality;

10

4. Installed six (6) soil vapor probes around Site perimeter and collected six (6) samples for

chemical analysis.

Summary of Environmental Findings

1. Elevation of the property ranges from 10 to 12 feet.

2. Depth to groundwater ranges from 13 to 18 feet at the Site.

3. Groundwater flow is generally from east to west beneath the Site.

4. Bedrock was not encountered during this investigation.

5. The soils at the Site are classified as Urban Land and generally consisted of dark brown,

fine to coarse sand with medium to fine gravel to a depth of approximately 13 to 18 feet

bgs, where the groundwater table was encountered. The vicinity of the Site is

approximately 10 feet above mean sea level.

6. Soil/fill samples collected during the 2014 Phase II and 2015 RI were compared to

6NYCRR Part 375-6.8 Unrestricted Use Soil Cleanup Objectives (SCOs) and Restricted-

Residential SCOs. Soil/fill samples showed that no VOCs, SVOCs, pesticides or PCBs

were detected in any of the soil samples at concentrations above the Unrestricted Use

SCOs. One metal, i.e., lead, was detected in sample SB-1 0’-2’ at a concentration of 115

mg/kg, exceeding the Unrestricted Use SCO. Overall, soil chemistry is unremarkable.

7. Groundwater samples collected during the 2014 Phase II and 2015 RI were compared to

NYSDEC 6NYCRR Part 703.5 Groundwater Quality Standards (GQS). Groundwater

samples showed that no pesticides or PCBs were detected in any of the groundwater

samples at concentrations above their respective GQS. One VOC, tetrachloroethene (6.4

ug/L), was detected above its GQS. Four SVOCs, benzo(a)anthracene (0.16 ug/L),

benzo(a)pyrene (0.14ug/L), benzo(b)fluoranthene (0.13ug/L) and chrysene (0.15 ug/L)

were detected above their respective GQS. Several metals were identified and, of those,

beryllium (3.5 ug/L), manganese (max of 848 ug/L), nickel (max of 442 ug/L) and

sodium (44,800 ug/L) were detected in dissolved groundwater samples at concentrations

above their respective GQS.

8. Soil vapor samples collected during the 2014 Phase II and 2015 RI were compared to the

compounds in Table 3.1 Air Guidance Valued derived by the New York State of Health

(NYSDOH) Final Guidance on Soil Vapor Intrusion (October 2006). Soil vapor samples

11

collected during the RI showed petroleum related VOCs present in low concentrations.

Total concentrations of petroleum-related VOCs (BTEX) had a maximum concentration

of 402.3 µg/m3. Samples showed elevated levels of chlorinated VOCs including 1,1,1-

trichloroethane (max. of 13,000 µg/m3), tetrachloroethene (max. of 11,000 µg/m3)

trichloroethane ( max of 3,700 µg/m3) in all six samples. All three compounds were

found detected above the monitoring/mitigation ranges established within the NYSDOH

Final Guidance on Soil Vapor Intrusion. Carbon tetrachloride was not detected in any of

the soil vapor samples.

These chlorinated solvent vapors identified in the soil vapor samples may be eluting from

an offsite source, as no prior use of solvents on the Site is known. Also, the soil and

groundwater results did not identify any chlorinated solvent contamination.

12

REMEDIAL INVESTIGATION REPORT

1.0 SITE BACKGROUND

11-12 30th Drive LLC is working with the New York City Mayor’s Office of Environmental

Remediation (NYC OER) to investigate and potentially remediate a 21,100-square foot site

located at 11-12 30th Drive in Astoria section of Queens, New York. Residential use is proposed

for the property. The RI work was performed between August 24 and August 26, 2015. This

RIR summarizes the nature and extent of contamination and provides sufficient information for

establishment of remedial action objectives, evaluation of remedial action alternatives, and

selection of a remedy that is protective of human health and the environment consistent with the

use of the property pursuant to RCNY§ 43-1407(f).

1.1 Site Location and Current Usage

The Site is located at 11-12 30th Drive in the Astoria section in Queens, New York and is

identified as Block 504 and New Lot 3 (previous lots 3 & 21, NYC DOB recently combined both

lots) on the New York City Tax Map. The Site is approximately 21,100-square feet and is

bounded by 30th Drive to the north, 31st Avenue to the south, 12th Street to the east, and Vernon

Boulevard to the west. A map of the site boundary is shown in Figure 1. Currently, the Site is

developed with two 1-story concrete block and brick buildings, a 1-story metal-constructed

storage building and associated concrete-paved parking lots. The Site is currently occupied by

The Bohea Associates NY, Ltd. (“Bohea”), an Asian food distribution company, and Titan

Media, an advertising display company.

1.2 Proposed Redevelopment Plan

The proposed future use of the Site will consist of two (2) residential buildings, totaling 711

apartments, including approximately 28,763 square foot courtyard. Layout of the proposed site

development is presented in Figure 2. The current zoning designation is R7A, R6B, a general

residential district. A brief R6B zoning guideline from the NYC DCP is attached as Figure 3.

The proposed use is consistent with existing zoning for the property.

The proposed development shall include two (2) residential buildings on the Site with a

footprint of approximately 70,102 square feet. The 1st building shall include a 9-story residential

building with two cellar levels and will have a total of 569 apartments. The cellars shall include

13

below grade parking and mechanical rooms. The 1st floor will comprise of common accessible

lobby and some recreation area for the residents. The street address for this building will be 30-

77 Vernon Boulevard, Astoria, NY 11102. The average depth of excavation shall be

approximately 15 feet below existing street grade.

The 2nd building shall comprise of a 6-story residential building with one cellar level and will

have a total of 142 affordable apartments. The cellar shall be used for parking and mechanical

rooms. The new address for this building shall be 30-80 12th Street, Astoria, NY 11102. The

average depth of excavation shall be approximately 15 feet below existing street grade.

1.3 Description of Surrounding Property

The Subject Property is bordered to the northeast by 30th Drive, residential buildings and a

commercial building; to the southeast by 12th Street, a residential building and a commercial

building; to the southwest by 31st Avenue, residential buildings and a commercial building; and

to the northwest by Vernon Boulevard and East River. Extended range surrounding properties

are consistent with the neighborhood trend of residential, commercial and light industrial

properties.

Figure 4 shows the surrounding land usage.

14

2.0 SITE HISTORY

2.1 Past Uses and Ownership

Prior to the construction of the existing improvements, previous Lot 3 was a vacant lot as of

at least 1898 to 1950 and previous Lot 21 was a vacant lot from at least 1915 to 1936. Prior to

that, previous Lot 21 contained two dwellings with two associated small sheds in at least 1898.

Previous occupants of the Site include the following:

Lot 3- Residental (1934)

Kikkoman International, Inc. (1967)

Japan Food Corporation (1967-70)

Japan Freight Consolidators (1970)

Lot 21 – General Motors Parts Division/Sales Corporation (1939-70)

Pop Displays/Phase Four Production (1983-05)

Bohea Associated NY Ltd. (2013)

Certified Locksmith, Jack the Plumber, Hoi Fung Seafood, Inc. (2013)

2.2 Previous Investigations

Both Phase I and Limited Phase II Environmental Site Assessments were conducted on this

Site prior to implementation of this Remedial Investigation. Previous environmental reports

prepared for this Site included:

1. Phase I Environmental Site Assessment by IVI Assessment Services, Inc. for Vernon

Realty, dated February 4, 2014.

2. Limited Phase II Environmental Site Assessment by IVI Environmental, Inc. for

Vernon Realty, dated March 17, 2014.

Both assessments revealed similar findings and are documented in this RIR report. Both

documents are provided hereto for further reference as Appendix D and Appendix E,

respectively.

2.3 Site Inspection

HARPAR conducted a Site inspection on August 21, 2015 focused on locating evidence of

surface spills, buried tanks, vent pipes and clearing proposed boring locations. An interior

15

inspection of the Site did not identify any environmental concerns, except for the metal storage

building which was inaccessible.

2.4 Areas of Concern

The AOCs identified for this Site in the previous Phase I report include:

1. New York City Little “E” Designation – An “E” Designation was placed on the

Subject Property for Hazardous Materials (E-245).

2. The Subject Site was formerly occupied by Pop Displays Drive, which was listed as a

Conditionally Exempt Small Quantity Generator (CESQG) in 2006 and 2007. This

facility was also listed as a Small Quantity Generator (SQG) in 1999 and as a Large

Quantity Generator (LQG) in 1984.

3. Two inactive aboveground storage tanks (ASTs) were observed in the northwestern

section of the cellar of the building located on former Lot 21. The tanks were

constructed with steel and had capacities of 5,000-gallons and 275-gallons.

A copy of the Phase I Report is presented in Appendix D.

16

3.0 PROJECT MANAGEMENT

3.1 Project Organization

The Qualified Environmental Profession (QEP) responsible for investigation activities and

preparation of this RIR is Mr. Hardik Parekh, P.E.

3.2 Health and Safety

All work described in this RIR was performed in full compliance with applicable laws and

regulations, including Site and OSHA worker safety requirements and HAZWOPER

requirements.

3.3 Materials Management

All material encountered during the RI was managed in accordance with applicable laws and

regulations.

17

4.0 REMEDIAL INVESTIGATION ACTIVITIES

HARPAR performed the following scope of work:

1. Conducted a Site inspection to identify AOCs and physical obstructions (i.e.

structures, buildings, etc.);

2. Installed six (6) soil borings across the entire project Site, and collected twelve (12)

soil samples for chemical analysis from the soil borings to evaluate soil quality;

3. Installed three (3) groundwater monitoring wells throughout the Site to establish

groundwater flow and collected three (3) groundwater samples for chemical analysis

to evaluate groundwater quality;

4. Installed six (6) soil vapor probes around Site perimeter and collected six (6) samples

for chemical analysis.

4.1 Geophysical Investigation

A geophysical survey was previously performed at this Site as part of the 2014 Limited

Phase II ESA. A fill port and vent pipe attached to a suspected underground storage tank (UST)

was identified. However, due to the building’s reinforced concrete slab, the presence of the UST

could not be confirmed. Based on the findings of the previous survey, HARPAR did not perform

a geophysical survey during this RI as it was deemed unwarranted.

4.2 Borings and Monitoring Wells

Drilling and Soil Logging

A total of six (6) soil borings (SB-1 through SB-6) were advanced at the Site as part of this

RI in accordance with an OER-approved sampling plan. The soil borings were advanced

utilizing a track-mounted direct-push drilling rig (Geoprobe 7822DT) by Active Environmental

Technologies, Inc. The soil borings were placed at locations throughout the Site within the

building and in the parking areas. Soil boring SB-4, originally proposed to be installed within

the metal storage building, was relocated outside to the north of the building due to

inaccessibility. The soil borings were advanced to depths of approximately 8 feet below grade

surface (bgs) to 20 feet bgs. The soils were field screened continuously to the final advancement

depths of each boring for visual impacts and for volatile organic vapors with a photoionization

18

detector (PID). PID readings were all 0.0 parts per million (ppm). Soil lithology was logged

based on the Unified Soil Classification System (USCS).

Boring logs were prepared by an environmental engineer are attached in Appendix B. A map

showing the location of soil borings and monitoring wells is shown in Figure 1.

Groundwater Monitoring Well Construction

A total of three (3) temporary groundwater wells (GW-1 through GW-3) were installed at the

Site as part of this RI in accordance with an OER-approved sampling plan. The wells were

installed utilizing a track-mounted direct-push drilling rig (Geoprobe 7822DT) by Active

Environmental Technologies, Inc. Groundwater sampling was conducted in accordance with the

procedures set forth in the NYSDEC DER-10 Technical Guidance for Site Investigation and

Remediation, dated May 2010.

The temporary groundwater wells were placed at locations throughout the Site within the

building and in the parking areas. The wells were installed to depths of approximately 20 to 25

feet bgs utilizing one-inch PVC piping. The wells were completed with bottom 10 feet of slotted

PVC screen pipe with top 10 to 15 feet of solid PVC riser pipe. Groundwater was encountered

in the wells at depths varying between 13 to 18 feet bgs.

Temporary monitoring well locations are shown in Figure 1.

Soil Vapor Probe Construction

A total of six (6) soil vapor probes were installed at the Site by an expendable metal soil

vapor implant utilizing a track-mounted direct-push drilling rig. The soil vapor points were

placed at locations throughout the Site within the building and in the parking areas. Soil vapor

point SV-6, originally proposed to be installed within the metal storage building, was relocated

outside to the north of the building due to inaccessibility. The vapor points were installed to

depths of approximately 15 feet bgs.

Once installed, HARPAR attached the polyethylene tubing to a hand pump and extracted

several volumes to remove atmospheric air that entered the bore hole. The tubing was then

connected to a 6L-liter summa vacuum canister equipped with a half -hour flow regulator. The

soil vapor probes were advanced to the desired depth using a direct push drill rig. The vapor

probes consisted of Geoprobe soil vapor implants (a 6-inch length of double woven stainless

steel wire). The implants were attached to a ¼-inch polyethylene tubing which extended

19

approximately 24 inches beyond the ground surface. The soil vapor implant tubing was capped

with a ¼-inch plastic end to prevent infiltration of foreign particles into the tubing. Coarse sand

was placed around the vapor implants to a height of approximately 12 inches above the bottom

of the implants. The remaining annular space was sealed with a bentonite slurry to the surface.

Soil vapor probe locations are shown in Figure 1.

Survey

Using a measuring wheel and Site boundaries as datum, sampling locations were depicted at

the Site.

Water Level Measurement

Groundwater at the Site was measured to the surface grade utilizing a water level meter.

4.3 Sample Collection and Chemical Analysis

Sampling performed as part of the field investigation was conducted for all Areas of Concern

and also considered other means for bias of sampling based on professional judgment, area

history, discolored soil, stressed vegetation, drainage patterns, field instrument measurements,

odor, or other field indicators. All media including soil, groundwater and soil vapor have been

sampled and evaluated in the RIR. Discrete (grab) samples have been used for final delineation

of the nature and extent of contamination and to determine the impact of contaminants on public

health and the environment. The sampling performed and presented in this RIR provides

sufficient basis for evaluation of remedial action alternatives, establishment of a qualitative

human health exposure assessment, and selection of a final remedy.

Soil Sampling

A total of twelve (12) soil samples were collected for chemical analysis during this RI,

including two samples from each boring (one shallow and one deep samples). Figure 1 shows the

location of samples collected in this investigation. Soil analyses included volatile organic

compounds (VOCs) via EPA Method 8260, semi-volatile organic compounds (SVOCs) via EPA

Method 8270, Target Analyte List (TAL) metals, polychlorinated biphenyls (PCBs) via EPA

Method 8082 and pesticides via EPA Method 8081.

One (1) duplicate sample was also collected for laboratory QA/QC purposes. The duplicate

sample was collected from the shallow depth sample from boring SB-6 and analyzed for VOCs

20

only. None of the VOCs were detected in the duplicate sample at concentrations exceeding their

respective laboratory method detection limits. The duplicate sample results were consistent with

the actual sample results.

Groundwater Sampling

A total of three (3) groundwater samples were collected for chemical analysis during this RI.

Groundwater samples were collected utilizing dedicated polyethylene tubing and a standard

peristaltic pump. Prior to sampling, a check valve bailer was utilized to verify the presence of

petroleum floating product, none was observed. One (1) groundwater sample was collected from

each temporary groundwater well. Approximately three well volumes were purged from each

well prior to sample collection. The samples were collected utilizing low flow sampling

methodology. All purged groundwater was containerized in a 30-gallon drum for disposal.

One (1) duplicate sample was also collected for laboratory QA/QC purposes. The duplicate

sample was collected from boring GW-2 location and was analyzed for VOCs only. The

laboratory analytical results detected only chloroform at a concentration exceeding its laboratory

method detection limit. This detection was consistent with the chloroform detection in the actual

groundwater sample collected from GW-2.

Groundwater samples collected as part of this investigation were properly labeled,

preserved, and placed in a cooler for transport via courier to TestAmerica. Proper chain of

custody procedures were followed. The groundwater samples were analyzed for VOCs via EPA

Method 8260, SVOCs via EPA Method 8270, TAL metals (filtered and unfiltered), pesticides via

EPA Method 8081 and PCBs via EPA Method 8082. Following the sample collection, the PVC

pipe was removed and the surface was restored to pre-sampling conditions. Groundwater

monitoring well locations are provided in Figure 1.

Soil Vapor Sampling

A total of six (6) soil vapor probes were installed and six (6) soil vapor samples were

collected for chemical analysis during this RI. Soil vapor sampling locations are shown in Figure

1.

The soil vapor samples were analyzed by a NYSDOH ELAP-certified laboratory for volatile

organic compounds using EPA Method TO-15. Methodologies used for soil vapor assessment

conform to the NYS DOH Final Guidance on Soil Vapor Intrusion, October 2006. Prior to

21

sampling, each sampling location was tested to ensure a proper surface seal has been obtained.

In accordance with the NYSDOH guidance, a tracer gas (helium) was used as a quality

assurance/quality control device to verify the integrity of the sampling point prior to sample

collection. Prior to testing and sample collection, a 1’x’1 glass seal enclosure was utilized. The

enclosure was tested with helium tracer gas utilizing a helium detector for atleast 15 minutes.

The tracer gas test procedure was employed at all soil vapor sampling locations. No surface seal

leaks were observed at any of the locations.

Following the verification of tight seal, three volumes (i.e., volume of the sample probe and

tube) of air was purged for the soil vapor implants using a calibrated vacuum pump. After

purging, a 6-liter Summa® canister, fitted with a ½-hr flow controller, was attached to the

sample tubing. Prior to initiating sample collection, sample identification, canister number, date

and time were recorded. Sampling then proceeded by fully opening the flow control valve on

each canister. Following the sample collection, the canisters were submitted to the laboratory,

under proper chain-of-custody for VOC analysis by EPA Method TO-15.

Soil vapor probe locations are shown in Figure 1.

Chemical Analysis

Chemical analytical work presented in this RIR has been performed in the following manner:

Factor Description

Quality Assurance Officer The chemical analytical quality assurance is directed by Hardik

Parekh, P.E.

Chemical Analytical

Laboratory

Chemical analytical laboratory(s) used in the RI is NYS ELAP

certified and were TestAmerica

Chemical Analytical

Methods

Soil analytical methods:

TAL Metals by EPA Method 6010C (rev. 2007);

VOCs by EPA Method 8260C (rev. 2006);

SVOCs by EPA Method 8270D (rev. 2007);

22

Pesticides by EPA Method 8081B (rev. 2000);

PCBs by EPA Method 8082A (rev. 2000);

Groundwater analytical methods:

TAL Metals by EPA Method 6010C (rev. 2007);

VOCs by EPA Method 8260C (rev. 2006);

SVOCs by EPA Method 8270D (rev. 2007);

Pesticides by EPA Method 8081B (rev. 2000);

PCBs by EPA Method 8082A (rev. 2000);

Soil vapor analytical methods:

VOCs by TO-15 VOC parameters.

Results of Chemical Analyses

Laboratory data for soil are summarized in Tables 1 to 4. Laboratory data for groundwater

are summarized in Tables 5 to 8. Laboratory data for soil vapor are summarized in Table 9.

Laboratory data deliverables for all samples evaluated in this RIR are provided in digital form in

Appendix C.

23

5.0 ENVIRONMENTAL EVALUATION

5.1 Geological and Hydrogeological Conditions

Stratigraphy

The soils at the Site are classified as Urban Land. Urban Land complex are those soils in

which the soil’s original structure and content have been so altered by human activities it has lost

its original characteristics and is thus unidentifiable. The bedrock at the Site is the Middle

Ordovician to Middle Cambrian Ravenswood Granodiorite. Along the western edge of the

property is the contact between the Ravenswood Granodiorite and the Inwood Marble. The

Inwood Marble is Lower Ordovician to Lower Cambrian.

The vicinity of the Site is approximately 10 feet above mean sea level. The ground surface at

the Site consists of asphalt-paved open area for parking and two (2) one-story

commercial/industrial buildings with approximately 6-inch thick concrete slab. The topography

of the area has a moderate to steep downward slope to the west, 12th Street towards Vernon

Boulevard (towards East River). Soil samples collected from soil borings advanced during the

RI generally consisted of dark brown, fine to coarse sand with medium to fine gravel to a depth

of approximately 13 to 18 feet bgs, where the groundwater table was encountered.

Hydrogeology

A table of water level data for all monitor wells is included in Table 5.1.1 below. The

average depth to groundwater is 15 feet below grade and the range in depth is 13 to 18 feet bgs.

A map of groundwater level elevations with groundwater contours and inferred flow lines is

shown in Figure 5. Groundwater flow is from east to west.

Table 5.1.1 Groundwater Level Data

Monitoring Well ID No. Date Water Elevation (feet below

grade surface)

GW-1 8/26/2015 15.10

GW-2 8/26/2015 13.75

GW-3 8/26/2015 17.75

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5.2 Soil Chemistry

Soil/fill samples collected during the 2014 Phase II and 2015 RI were compared to 6NYCRR

Part 375-6.8 Unrestricted Use Soil Cleanup Objectives (SCOs) and Restricted-Residential

SCOs. Soil/fill samples showed that no VOCs, SVOCs, pesticides or PCBs were detected in any

of the soil samples at concentrations above the Unrestricted Use SCOs. One metal, i.e., lead,

was detected in sample SB-1 0’-2’ at a concentration of 115 mg/kg, exceeding the Unrestricted

Use SCO.NYCRR Part 375 Unrestricted Use Soil Cleanup Objectives.

Data collected during the RI is sufficient to delineate the vertical and horizontal distribution

of contaminants in soil/fill at the Site. Summary tables of data for chemical analyses performed

on soil samples are included in Tables number1 to 4. Figure 1 shows the soil sampling locations.

5.3 Groundwater Chemistry

Groundwater samples collected during the 2014 Phase II and 2015 RI were compared to

NYSDEC 6NYCRR Part 703.5 Groundwater Quality Standa rds (GQS). Groundwater samples

showed that no pesticides or PCBs were detected in any of the groundwater samples at

concentrations above their respective GQS. One VOC, tetrachloroethene (6.4 ug/L), was

detected above its GQS. Four SVOCs, benzo(a)anthracene (0.16 ug/L), benzo(a)pyrene

(0.14ug/L), benzo(b)fluoranthene (0.13ug/L) and chrysene (0.15 ug/L) were detected above their

respective GQS. Four metals, beryllium (3.5 ug/L), manganese (max of 848 ug/L), nickel (max

of 442 ug/L) and sodium (44,800 ug/L) were detected in filtered groundwater samples at

concentrations above their respective GQS.

Data collected during the RI is sufficient to delineate the distribution of contaminants in

groundwater at the Site. Summary tables of data for chemical analyses performed on

groundwater samples are included in Tables 5 to 8. Figure 1 shows the groundwater sampling

locations.

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5.4 Soil Vapor Chemistry

Soil vapor samples collected during the 2014 Phase II and 2015 RI were compared to the

compounds in Table 3.1 Air Guidance Valued derived by the New York State of Health

(NYSDOH) Final Guidance on Soil Vapor Intrusion (October 2006). Soil vapor samples

collected during the RI showed petroleum related VOCs present in low concentrations. Total

concentrations of petroleum-related VOCs (BTEX) had a maximum concentration of 402.3

µg/m3. Samples showed elevated levels of chlorinated VOCs including 1,1,1-trichloroethane

(max. of 13,000 µg/m3), tetrachloroethene ( max. of 11,000 µg/m3) trichloroethane ( max of

3,700 µg/m3) in all six samples. All three compounds were found detected above the

monitoring/mitigation ranges established within the NYSDOH Final Guidance on Soil Vapor

Intrusion. Carbon tetrachloride was not detected in any of the soil vapor samples.

These chlorinated solvent vapors identified in the soil vapor samples may be eluting from an

offsite source, as no prior use of solvents on the Site is known. Also, the soil and groundwater

results did not identify any chlorinated solvent contamination.

Data collected during the RI is sufficient to delineate the distribution of contaminants in soil

vapor at the Site. A summary table of data for chemical analyses performed on soil vapor

samples are included in Table 9. Figure 1 shows the soil vapor locations.

5.5 Prior Activity

Based on an evaluation of the data and information from the RIR, disposal of significant

amounts of hazardous waste is not suspected at this site.

5.6 Impediments to Remedial Action

There are no known impediments to remedial action at this property.