EjlV-1091gt~ 1) TA-lI-MVAJS-PLAN-UUULl-KU AKhAS J ANV 10 hXCAVATlUN C Page 1 otl

Return To Library gt Records 2 gt ERID-109000 Through ERIDmiddot109499 gt ERIDmiddot1091581) TAmiddot21middotMDABshyPLAN-00012middotRO AREAS 9 AND 10 EXCAVATION CONTROL PLAN 2) ATTACHED CD

Created By Aurelia A MartinezlUSERSILANL File name Master-Media Targetpdf Version 10 Document Type RPF Record Description SUBMITTED BY BRITTANY DONNELLY

NORlHWIND

Document Details Title ERID-I09158 I) TA-21-MDAB-PLAN-00012-RO AREAS 9 AND 10

EXCAVATION CONTROL PLAN 2) ATTACHED CD ERID NumberStartPage 109158 Office of Record Business amp Project Services Date Received 04282010 Official Use Only N Page Count 6 Record Type Letter Document Date 021182010 To(Addressees - Organization) NA From(Senders - Organization) LANL Other Document Number(s) PKG-1831 TA TA-21

October 22ml 2f)09

Denotes Fields that are mandatory

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II File Cabinet Records 2

Binder Category ERID-l 00000 Through ERID-l 09999

middot1 Binder ERID-l09000 Through ERID-I 09499

33630

11111111111111111111111111111111111

2182010 Page 2 of 5 TA21-MDAB-PLAN-00012-R0

EXCAVATION CONTROL PLAN (TA21-MDAB-PLAN-00012-R0)

AREAS 9 amp 10 ndash MDAB

Sampling of soil was performed in Areas 9 and 10 of MDA-B Solid Waste management Unit 21-015 at Technical Area 21 in the late summer and fall of 2009 using direct-push technology (DPT) Seven samples from seven locations were collected from Area 9 and fourteen samples from ten locations were collected from Area 10 Top of native Tuff was observed from depths of 3 to 5 feet below ground surface (ft-bgs) in Area 9 and from depths of 45 to 75 ft-bgs in Area 10 Soil from each DPT collection sleeve was screened with a portable gamma spec and if a sufficient quantity of soil was available the soil was combined and analyzed for the following

bull Radiochemistry ndash gamma spec strontium-90 tritium americium-241 isotopic plutonium isotopic thorium and isotopic uranium

bull Total Inorganics ndash TCL metals mercury reactive cyanide and reactive sulfide and

bull Total Organics ndash pesticides PCBs herbicides VOC and SVOC

All seven samples collected from Area 9 were analyzed for methods listed above Most samples collected from Area 10 were analyzed for all methods with the exception of two samples that were not analyzed for Inorganics and VOCs six samples that were not analyzed for isotopic thorium and one sample that was not analyzed for americium-241 isotopic thorium and reactive cyanide It is not clear why some of the samples were not analyzed for the full suite of analyses but a lack of sufficient quantity of soil was likely the reason

Analytical results of all soil samples collected in Areas 9 and 10 were found to be below all residential radiological Soil Action Levels (SALs) and all NMED August 2009 residential Soil Screening Levels (SSLs)

OBJECTIVES OF AREA 9 amp 10 INVESTIGATION

The objective of the excavationtrenching activities is to determine presence or absence of buried waste material by digging exploratory test trenches to the top of the native Tuff This activity will be performed because the sample collection with DPT does not provide a large enough sample of material for visual observation Thus conclusive evidence showing that waste material was not buried in these areas is minimal To gather more conclusive evidence regarding the presence or absence of waste buried in these areas further site investigation at Areas 9 and 10 that includes the completion of exploratory or investigation trenches down to the top of the native Tuff is proposed All excavated material will be visually inspected photographed and screened for radiological activity and organic vapors If significant waste material is observed or if radiological or organic vapor survey levels are above background levels then at the discretion of the subject matter expert (SME) and Operations personnel samples of soil may also be collected for analysis INVESTIGATION PROCEDURES

The historical documents associated with MDA-B describe the suspected waste disposal pits in Areas 9 and 10 as two pits ldquoin the west end running north and south making the lsquoLrsquo shape to the fencerdquo To

2182010 Page 3 of 5 TA21-MDAB-PLAN-00012-R0

increase the probability of locating north-south running pits a series of east-west oriented investigation trenches are proposed for excavation The proposed location of the investigation trenches are shown in the attached Sketch TA-21-SKT-MDAB-001 Four trenches (A-D) are proposed for Area 10 and five trenches (E-I) are proposed for Area 9 No trenching is proposed in Area 9 near DPT sampling locations AI155 and AI157 as the levels of Pu and depth to native tuff suggest that this area is within an extended area of Area 8

Prior to beginning excavation the ends of each of the test trenches will be located by a surveyor and marked with a stake or flag Location data for east and west ends of each proposed trench is provided in the following table Easting and Northing data are in feet and referenced to the New Mexico State Plane Coordinate System Central Zone NAD 1983

INVESTIGATION TRENCH GRID ID POINT DESCRIPTION

EASTING (FT)

NORTHING (FT)

A AV150 AE (east end Trench A) 1629131 1774971 A AV155 AW (west end Trench A) 1629179 1774975 B AT150 BE (east end Trench B) 1629129 1774991

B AT155 BW (west end Trench B) 1629179 1774995 C AR150 CE (east end Trench C) 1629127 1775012 C AR155 CW (west end Trench C) 1629177 1775014 D AP150 DE (east end Trench D) 1629126 1775032

D AP155 DW (west end Trench D) 1629176 1775032 E AN151 EE (east end Trench E) 1629133 1775053 E AN155 EW (west end Trench E) 1629173 1775053 F AL151 FE (east end Trench F) 1629133 1775073

F AN156 FW (west end Trench F) 1629183 1775073 G AJ151 GE (east end Trench G) 1629129 1775093 G AJ153 GW (west end Trench G) 1629149 1775093 H AG152 HE (east end Trench H) 1629136 1775123

H AG157 HW (west end Trench H) 1629186 1775125 I AE152 IE (east end Trench I) 1629136 1775143 I AE157 IW (west end Trench I) 1629186 1775145

Excavation of the investigation trenches will begin with those located within the southern portion of Area 10 (Trench A) and proceed north into Area 9 Excavation of the each trench will begin at the west end and progress eastward Material will be removed from the trench and deposited along the north side of the excavation Placement of the excavated material on the north side of the trench is a best management practices (BMP) requirement of the Stormwater Pollution Prevention Plan (SWPP) The equipment operator will then use the excavator bucket to spread out material in a manner that will allow for the inspection of the excavated material The material will be surveyed for radioactivity using the appropriate instrument as determined in the RWP and for organic vapors using a photo-ionization detector (PID) Photographs will be taken of the excavated material and the open test trench at each end and at approximately 10-foot intervals along the length of the test trench

2182010 Page 4 of 5 TA21-MDAB-PLAN-00012-R0

Each test trench will be excavated until native Tuff is reached Native Tuff in Area 9 is expected to range from depths of 3 to 5 feet below ground surface (ft-bgs) and in Area 10 to range from depths of 45 to 75 ft-bgs Excavation of each test trench will proceed in this manner until the end of the trench is reached The work will pause if buried waste is discovered or if radiation or PID survey levels of the excavated material are observed to be significantly above background levels as determined by SME Historically buried radioactively contaminated waste was believed to consist of paper rags rubber gloves glassware and small metal apparatuses placed in cardboard boxes and sealed with masking tape Other waste material could include building demolition debris metal air ducts or large metal apparatuses that may have been placed in wooden boxes or wrapped in paper prior to disposal The SME in consultation with Operations personnel will assess the situation and will determine if a sample of the excavated material is to be collected and if the test trench excavation is to continue

All excavated material will be returned to the test trench upon completion of observations and sampling if conducted and before the start of excavation within the next test trench (a BMP of the SWPP) Excavated material will be backfilled in controlled lifts and will be compacted with the excavator bucket Water will be added from a spray nozzle as needed for dust suppression and to enhance compaction

SOIL SAMPLING RECOMMENDATIONS

No samples of material excavated from the test trenches will be collected unless observation of buried waste material or elevated survey levels prompt the SME in consultation with Operations personnel to collect a sample All soil samples if collected will be collected one of the following ways

1 Sampled from each pile using an auger or thin-wall tube sampler in accordance with SOP-0610 Hand Auger and Thin-Wall Tube Sampler or subcontractor equivalent procedure The sample will be collected by augering from the surface to the bottom of the waste in a sufficient number of locations to obtain a representative sample

2 Sampled from the excavation bucket in accordance with SOP-0611 Spade and Scoop Method for Collection of Soil Samples

Samples will be analyzed for volatile organic compounds (VOCs) semi-volatile organic compounds (SVOCs) PCBs radionuclides total metals pesticidesherbicides and toxicity characteristic metals if needed Total petroleum hydrocarbons (TPH) will be analyzed if staining is observed Other constituents may be analyzed as necessary to meet the WAC of the disposal facility Existing data from previous investigations may be used to supplement these analyses (eg to identify that perchlorates and nitrates are not present) All soil andor waste materials (if found) will be returned to the trench after inspection andor sampling

INVESTIGATION DOCUMENTATION

Investigation activities and observations will be documented in the project field notebook that is to be dedicated to this task Routine notebook entries will be made in accordance to the methods presented in the Waste amp Environmental Services (WES) SOP-5181 Notebook Documentation for Waste and Environmental Services Field Activities

2182010 Page 5 of 5 TA21-MDAB-PLAN-00012-R0

Information to be included in the project field notebook shall include but not be limited to

bull Date time on site general description of weather and site conditions

bull List of personnel and equipment on site

bull List of monitoring equipment with serial numbers and calibration documentation

bull Summary of daily safety briefing

bull List of visitors to the site with times entering and leaving the site

bull Description of photographs taken including time and general location and direction of camera

bull Location and description of any samples that are collected including ID number and analyses

bull List of samples collected during the day along with analyses requested

bull Description of directiondecisions provided by Operations personnel

bull Description of work completed during the day

WASTE MANAGEMENT

All waste generated during the activity described in this plan will be handled in accordance with the project WCSF

2182010 Page 3 of 5 TA21-MDAB-PLAN-00012-R0

increase the probability of locating north-south running pits a series of east-west oriented investigation trenches are proposed for excavation The proposed location of the investigation trenches are shown in the attached Sketch TA-21-SKT-MDAB-001 Four trenches (A-D) are proposed for Area 10 and five trenches (E-I) are proposed for Area 9 No trenching is proposed in Area 9 near DPT sampling locations AI155 and AI157 as the levels of Pu and depth to native tuff suggest that this area is within an extended area of Area 8

Prior to beginning excavation the ends of each of the test trenches will be located by a surveyor and marked with a stake or flag Location data for east and west ends of each proposed trench is provided in the following table Easting and Northing data are in feet and referenced to the New Mexico State Plane Coordinate System Central Zone NAD 1983

INVESTIGATION TRENCH GRID ID POINT DESCRIPTION

EASTING (FT)

NORTHING (FT)

A AV150 AE (east end Trench A) 1629131 1774971 A AV155 AW (west end Trench A) 1629179 1774975 B AT150 BE (east end Trench B) 1629129 1774991

B AT155 BW (west end Trench B) 1629179 1774995 C AR150 CE (east end Trench C) 1629127 1775012 C AR155 CW (west end Trench C) 1629177 1775014 D AP150 DE (east end Trench D) 1629126 1775032

D AP155 DW (west end Trench D) 1629176 1775032 E AN151 EE (east end Trench E) 1629133 1775053 E AN155 EW (west end Trench E) 1629173 1775053 F AL151 FE (east end Trench F) 1629133 1775073

F AN156 FW (west end Trench F) 1629183 1775073 G AJ151 GE (east end Trench G) 1629129 1775093 G AJ153 GW (west end Trench G) 1629149 1775093 H AG152 HE (east end Trench H) 1629136 1775123

H AG157 HW (west end Trench H) 1629186 1775125 I AE152 IE (east end Trench I) 1629136 1775143 I AE157 IW (west end Trench I) 1629186 1775145

Excavation of the investigation trenches will begin with those located within the southern portion of Area 10 (Trench A) and proceed north into Area 9 Excavation of the each trench will begin at the west end and progress eastward Material will be removed from the trench and deposited along the north side of the excavation Placement of the excavated material on the north side of the trench is a best management practices (BMP) requirement of the Stormwater Pollution Prevention Plan (SWPP) The equipment operator will then use the excavator bucket to spread out material in a manner that will allow for the inspection of the excavated material The material will be surveyed for radioactivity using the appropriate instrument as determined in the RWP and for organic vapors using a photo-ionization detector (PID) Photographs will be taken of the excavated material and the open test trench at each end and at approximately 10-foot intervals along the length of the test trench

2182010 Page 4 of 5 TA21-MDAB-PLAN-00012-R0

Each test trench will be excavated until native Tuff is reached Native Tuff in Area 9 is expected to range from depths of 3 to 5 feet below ground surface (ft-bgs) and in Area 10 to range from depths of 45 to 75 ft-bgs Excavation of each test trench will proceed in this manner until the end of the trench is reached The work will pause if buried waste is discovered or if radiation or PID survey levels of the excavated material are observed to be significantly above background levels as determined by SME Historically buried radioactively contaminated waste was believed to consist of paper rags rubber gloves glassware and small metal apparatuses placed in cardboard boxes and sealed with masking tape Other waste material could include building demolition debris metal air ducts or large metal apparatuses that may have been placed in wooden boxes or wrapped in paper prior to disposal The SME in consultation with Operations personnel will assess the situation and will determine if a sample of the excavated material is to be collected and if the test trench excavation is to continue

All excavated material will be returned to the test trench upon completion of observations and sampling if conducted and before the start of excavation within the next test trench (a BMP of the SWPP) Excavated material will be backfilled in controlled lifts and will be compacted with the excavator bucket Water will be added from a spray nozzle as needed for dust suppression and to enhance compaction

SOIL SAMPLING RECOMMENDATIONS

No samples of material excavated from the test trenches will be collected unless observation of buried waste material or elevated survey levels prompt the SME in consultation with Operations personnel to collect a sample All soil samples if collected will be collected one of the following ways

1 Sampled from each pile using an auger or thin-wall tube sampler in accordance with SOP-0610 Hand Auger and Thin-Wall Tube Sampler or subcontractor equivalent procedure The sample will be collected by augering from the surface to the bottom of the waste in a sufficient number of locations to obtain a representative sample

2 Sampled from the excavation bucket in accordance with SOP-0611 Spade and Scoop Method for Collection of Soil Samples

Samples will be analyzed for volatile organic compounds (VOCs) semi-volatile organic compounds (SVOCs) PCBs radionuclides total metals pesticidesherbicides and toxicity characteristic metals if needed Total petroleum hydrocarbons (TPH) will be analyzed if staining is observed Other constituents may be analyzed as necessary to meet the WAC of the disposal facility Existing data from previous investigations may be used to supplement these analyses (eg to identify that perchlorates and nitrates are not present) All soil andor waste materials (if found) will be returned to the trench after inspection andor sampling

INVESTIGATION DOCUMENTATION

Investigation activities and observations will be documented in the project field notebook that is to be dedicated to this task Routine notebook entries will be made in accordance to the methods presented in the Waste amp Environmental Services (WES) SOP-5181 Notebook Documentation for Waste and Environmental Services Field Activities

2182010 Page 5 of 5 TA21-MDAB-PLAN-00012-R0

Information to be included in the project field notebook shall include but not be limited to

bull Date time on site general description of weather and site conditions

bull List of personnel and equipment on site

bull List of monitoring equipment with serial numbers and calibration documentation

bull Summary of daily safety briefing

bull List of visitors to the site with times entering and leaving the site

bull Description of photographs taken including time and general location and direction of camera

bull Location and description of any samples that are collected including ID number and analyses

bull List of samples collected during the day along with analyses requested

bull Description of directiondecisions provided by Operations personnel

bull Description of work completed during the day

WASTE MANAGEMENT

All waste generated during the activity described in this plan will be handled in accordance with the project WCSF

2182010 Page 4 of 5 TA21-MDAB-PLAN-00012-R0

Each test trench will be excavated until native Tuff is reached Native Tuff in Area 9 is expected to range from depths of 3 to 5 feet below ground surface (ft-bgs) and in Area 10 to range from depths of 45 to 75 ft-bgs Excavation of each test trench will proceed in this manner until the end of the trench is reached The work will pause if buried waste is discovered or if radiation or PID survey levels of the excavated material are observed to be significantly above background levels as determined by SME Historically buried radioactively contaminated waste was believed to consist of paper rags rubber gloves glassware and small metal apparatuses placed in cardboard boxes and sealed with masking tape Other waste material could include building demolition debris metal air ducts or large metal apparatuses that may have been placed in wooden boxes or wrapped in paper prior to disposal The SME in consultation with Operations personnel will assess the situation and will determine if a sample of the excavated material is to be collected and if the test trench excavation is to continue

All excavated material will be returned to the test trench upon completion of observations and sampling if conducted and before the start of excavation within the next test trench (a BMP of the SWPP) Excavated material will be backfilled in controlled lifts and will be compacted with the excavator bucket Water will be added from a spray nozzle as needed for dust suppression and to enhance compaction

SOIL SAMPLING RECOMMENDATIONS

No samples of material excavated from the test trenches will be collected unless observation of buried waste material or elevated survey levels prompt the SME in consultation with Operations personnel to collect a sample All soil samples if collected will be collected one of the following ways

1 Sampled from each pile using an auger or thin-wall tube sampler in accordance with SOP-0610 Hand Auger and Thin-Wall Tube Sampler or subcontractor equivalent procedure The sample will be collected by augering from the surface to the bottom of the waste in a sufficient number of locations to obtain a representative sample

2 Sampled from the excavation bucket in accordance with SOP-0611 Spade and Scoop Method for Collection of Soil Samples

Samples will be analyzed for volatile organic compounds (VOCs) semi-volatile organic compounds (SVOCs) PCBs radionuclides total metals pesticidesherbicides and toxicity characteristic metals if needed Total petroleum hydrocarbons (TPH) will be analyzed if staining is observed Other constituents may be analyzed as necessary to meet the WAC of the disposal facility Existing data from previous investigations may be used to supplement these analyses (eg to identify that perchlorates and nitrates are not present) All soil andor waste materials (if found) will be returned to the trench after inspection andor sampling

INVESTIGATION DOCUMENTATION

Investigation activities and observations will be documented in the project field notebook that is to be dedicated to this task Routine notebook entries will be made in accordance to the methods presented in the Waste amp Environmental Services (WES) SOP-5181 Notebook Documentation for Waste and Environmental Services Field Activities

2182010 Page 5 of 5 TA21-MDAB-PLAN-00012-R0

Information to be included in the project field notebook shall include but not be limited to

bull Date time on site general description of weather and site conditions

bull List of personnel and equipment on site

bull List of monitoring equipment with serial numbers and calibration documentation

bull Summary of daily safety briefing

bull List of visitors to the site with times entering and leaving the site

bull Description of photographs taken including time and general location and direction of camera

bull Location and description of any samples that are collected including ID number and analyses

bull List of samples collected during the day along with analyses requested

bull Description of directiondecisions provided by Operations personnel

bull Description of work completed during the day

WASTE MANAGEMENT

All waste generated during the activity described in this plan will be handled in accordance with the project WCSF

2182010 Page 5 of 5 TA21-MDAB-PLAN-00012-R0

Information to be included in the project field notebook shall include but not be limited to

bull Date time on site general description of weather and site conditions

bull List of personnel and equipment on site

bull List of monitoring equipment with serial numbers and calibration documentation

bull Summary of daily safety briefing

bull List of visitors to the site with times entering and leaving the site

bull Description of photographs taken including time and general location and direction of camera

bull Location and description of any samples that are collected including ID number and analyses

bull List of samples collected during the day along with analyses requested

bull Description of directiondecisions provided by Operations personnel

bull Description of work completed during the day

WASTE MANAGEMENT

All waste generated during the activity described in this plan will be handled in accordance with the project WCSF