W912DR18R0055_-_Attachment_BR_-App_G2_Final_OU_&_VMP_Tech_Memo_-_Sept_2014-11-01-15.pdf

FINAL

QUARTERLY VAPOR MONITORING

TECHNICAL MEMORANDUM

(SEPTEMBER 2014)

FOR OPERABLE UNIT 7

DEFENSE SUPPLY CENTER RICHMOND

Prepared For

Defense Logistics Agency and

Defense Supply Center Richmond

November 2015

FINAL

QUARTERLY VAPOR MONITORING

TECHNICAL MEMORANDUM

(SEPTEMBER 2014)

FOR OPERABLE UNIT 7

DEFENSE SUPPLY CENTER RICHMOND

Prepared For:

Defense Supply Center Richmond

Defense Logistics Agency

USACE – Tulsa District

Prepared By:

AECOM, Inc.

Contract No. W912BV-10-D-2006

Task Order No. 0014

November 2015

Final Quarterly Vapor Monitoring Technical Memorandum (September 2014) Operable Unit 7, Defense Supply Center Richmond November 2015 i

Table of Contents

1 INTRODUCTION

2 OU 7 BACKGROUND

3 FIELD ACTIVITIES

4 FIELD RESULTS

List of Figures Figure 1: OU 7 Vapor Monitoring Locations – September 2014

List of Tables Table 1: OU 7 Soil Gas Monitoring Data

List of Attachments ATTACHMENT A: Graphs of Oxygen, Methane, and VOC Levels for OU 7 Soil Gas

ATTACHMENT B: Response to Comments ii

Acronyms and Abbreviations % percent

DLA Defense Logistics Agency

FTA Fire Training Area

LEL Lower Explosive Limit mL/min milliliters per minute

OU Operable Unit

PID Photoionization Detector ppm part per million

QAPP Quality Assurance Project Plan

RD/RAWP Remedial Design/Remedial Action Work Plan

TVH Total Volatile Hydrocarbons

USACE United States Army Corps of Engineers

VMP Vapor Monitoring Point

VOC Volatile Organic Compound

1 INTRODUCTION

This technical memorandum summarizes the soil gas monitoring data collected in September

2014 as part of the periodic vapor monitoring at Operable Unit (OU) 7 at the Defense Supply

Center Richmond. This document is intended to provide a timely submission of monitoring data for the Planning Team, with a thorough data analysis presented in the Annual Report.

Activities consisted of screening of soil vapor at six vapor monitoring points (VMPs) located around Building 72 and in a parking area to the northeast of Building 72. Soil vapor monitoring in these areas is intended to monitor for the potential accumulation of vapors (i.e. chlorinated volatile organic compounds [VOCs] and/or methane) as a result of remedy implementation.

Vapor monitoring is included as part of remedy implementation as presented in the OU7

Remedial Design/Remedial Action Work Plan Addendum (RD/RAWP; AECOM, 2013).

Defense Supply Center Richmond (the installation) is an approximately 650-acre installation located near Richmond, Virginia and is the Defense Logistics Agency’s (DLA) aviation demand and supply chain manager. OU 7 is located in the southern portion of the installation.

The field activities presented herein were performed by DLA’s contractor AECOM Technical

Services under the United States Army Corps of Engineers (USACE), Tulsa District Contract

Number W912BV-10-D-2006 (Task Order 0014).

2 OU 7 BACKGROUND

OU 7 encompasses the impacted ground water beneath and downgradient of OU 4 (Fire Training

Area [FTA] Pits #1, 2, and 3) in the southern portion of the installation. Historically, three separate, unlined pits were used for fire-fighting training purposes. Flammable liquid chemicals and petroleum products were dumped into the pits, ignited, and extinguished during the training.

Pit 1, in the eastern portion of OU 4, was used from the mid-1970s to 1979. Pit 1 was a circular area approximately 50 feet in diameter and 3 feet deep, and it might have been used for drum storage or trash burning prior to use for fire training. Pit 1 was reportedly filled with soil and graded in 1983. Pit 2, in the central portion of OU 4 west of Pit 1, was used from the late 1960s until it was replaced by Pit 1 in the 1970s. Pit 2 was rectangular with dimensions of approximately 20 feet north to south by 40 feet east to west. The depth of Pit 2 was unknown.

Pit 2 was reportedly filled with soil and graded sometime between 1973 and 1975. Pit 3, in the western portion of OU 4, was a suspected fire training pit identified in 1969 aerial photographs.

A 300,000-gallon Fuel Oil Storage tank was constructed over a portion of Pit 3 in 1975. The tank was removed in 1997 (MACTEC, 2006).

Current land use in the OU 7 areas includes a building, roadways, and parking lots. Kingsland

Creek runs along the southern boundary of the installation. The area surrounding Kingsland

Creek is wooded. The wooded area is a wildlife habitat and contains wetlands. Areas north of this wooded area and south of the former FTA are open. Storm and sanitary sewers run throughout OU 7 area. Storm sewers discharge to Kingsland Creek south of OU 4. Storm and sanitary sewers do not extend off the installation.

3 FIELD ACTIVITIES

On September 11th, 2014, field measurements for oxygen, carbon dioxide, methane, total volatile hydrocarbons (TVH) and VOCs were made using direct reading meters (e.g., RKI Eagle

Multigas meter for oxygen, carbon dioxide, methane, TVH and a Photo Ionization Detector

[PID] meter for VOCs). The meters were calibrated according to the manufacturer’s specifications prior to field use.

Air screening samples for measurement were collected in one liter Tedlar bags using an electrical vacuum pump and nylon tubing. Once a new section of nylon tubing was connected to the VMP, air was pumped at a rate of approximately 200 mL/min into a Tedlar bag. The reading meters were then used to screen the air directly from the Tedlar bag. An individual Tedlar bag was dedicated to each VMP. Three air screening readings were taken in succession at each VMP.

Field activities were completed in accordance with the project Quality Assurance Project Plan

(QAPP) (AECOM, 2014).

4 FIELD RESULTS

The vapor monitoring data from October 2013 through September 2014 for OU7 is presented in

Table 1. Table 1 also shows the intake depth (i.e. screened interval) for each VMP. Figure 1 shows the VMP locations.

Building 72

Soil vapor samples could not be collected from VMPs 114 and 115, because of water present in the VMPs during the monitoring event. An attempt was made to remove water from VMP114 and VMP115 using a vacuum pump. However, water continued to come out of the sample port after purging for 10 minutes producing approximately 1.5 liters of water.

Methane was not detected in the soil vapor samples collected from VMPs 112 and 113. The monitoring equipment detected VOCs at concentrations less than 1 part per million (ppm), and no carbon dioxide or methane in these VMPs.

Northeast Parking Area

Methane was detected at concentrations exceeding the lower explosive limit (LEL) of 5% of methane by weight at VMPs 110-3 and 111-6. The monitoring equipment detected VOCs at concentrations less than 1 ppm. Carbon monoxide was detected at concentrations of 29 and 59 ppm and carbon dioxide was detected at concentrations of 22.2% and 24.8%. Hydrogen Sulfide was detected at concentrations of 6 ppm and 15 ppm.

Based on the above soil gas monitoring data, the VMPs around Building 72 did not show any levels of methane and VOC levels all remain below 1 ppm. VMP111-6 and VMP110-3 are located directly downgradient of Injection Wells 104, 105, 106, and 107, which received injectate in 2009 during treatability testing (Final Treatability Studies Results for OUs 6 and 7, AECOM 2010). Injections were completed both upgradient and downgradient of this area in

June/July 2013 during remedy installation. Emulsified vegetable oil has been injected at these locations to support enhanced reductive dechlorination. Methane gas production is a common byproduct of this process. At this time, there are no receptors in the northeastern parking area

(no buildings) or known utilities in this area.

As presented in the OU 7 RD-RAWP, vapor monitoring is presented relative to Building 72 (4

VMPs) and protecting potential receptors (building occupants) against any vapor intrusion hazards:

Soil vapor monitoring near Building 72 is intended to monitor for the potential accumulation of vapors (i.e. chlorinated VOCs and methane) as a result of remedy implementation.

If on-site measurement indicates the accumulation of vapors, analytical samples will be collected for offsite sample analysis. Tenants of the building will be notified of the presence of subsurface vapors and evacuated if necessary. A contingent sub-slab depressurization system will be installed in order to mitigate the condition and prevent vapor intrusion if deemed necessary. Typically, additional off-site analysis will be performed and subsurface depressurization system will be installed if methane or VOC concentrations increase by a factor of three or more, or are approaching LEL levels (for methane).

Based on quarterly monitoring results, the area around Building 72 has not shown increased methane or VOC levels that meet these criteria. If methane concentrations increase at Building

72 VMPs to 25% of the LEL for Methane (i.e. 1% total methane), action will be taken to address these concentrations, which may include a sub-slab venting system. This action level (25% of the LEL for methane) follows Virginia landfill decomposition gas regulations (9VAC20-81-

200).

The field data indicates that the increased levels of methane produced due to injection activities have not affected Building 72. The methane levels present in the Northeastern Parking Area will continue to be monitored quarterly. There are no receptors in this area (no buildings or other occupancy of this space) and no subsurface utilities in the vicinity of VMPs 110-3 and 111-6.

LUCs are in place to prevent subsurface excavation without prior approval, which will eliminate potential soil disturbance in the Northeastern parking area. Continued monitoring of the

Northeastern parking area will provide the data necessary to evaluate any changes in methane or

VOC concentrations in order to assess any potential effects on Building 72 occupants.

It is recommended that the future quarterly air monitoring activities continue as scheduled.

FIGURES

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DEFENSE SUPPLY

CENTER RICHMOND

RICHMOND, VIRGINIA

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PROJ. NO.

Robert Onderko

Robert Stubblefield

DATE

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Note:

Monitoring data denoted in per cent.

O2 1.1

CO2 22.2

CH4 43.3

LEL OVER

H2S 6

CO2 59

VOC 0.2

Sep-14

O2 1.3

CO2 24.8

CH4 48

LEL OVER

H2S 15

CO2 39

VOC 0.7

Sep-14

O2 13.8

CO2 4.2

VOC 0.8

Sep-14

O2 20.8

VOC 0.4

Sep-14

TABLES

Table 1: OU 7 Soil Vapor Monitoring Data - October 2013 - September 2014

Area Sample Location

Screened Interval Date Time Reading

Number O2 %

(Gem 2000) O2 %

(MultiRAE)

CO2 %

(GEM 2000)

CH4 %

(GEM 2000)

LEL%

(MultiRAE) H2S ppm

(MultiRAE) CO ppm

(MultiRAE) VOC ppm

(MultiRAE) 13:10 1 21.2 20.9 0 0 0 0 0 0 13:15 2 21.3 21.7 0 0 0 0 0 0 13:20 3 21.3 21.8 0 0 0 0 0 0 15:10 1 20.8 20.9 0 0 0 0 0 0 15:15 2 20.9 20.9 0 0 0 0 0 0 15:20 3 20.9 20.9 0 0 0 0 0 0 09:00 1 20.9 20.9 0 0 0 0 0 0 09:05 2 20.9 20.9 0 0 0 0 0 0 09:08 3 20.9 20.9 0 0 0 0 0 0 13:50 1 20.3 19.7 0.5 0 0 0 0 0.1 13:55 2 20.5 19.8 0.5 0 0 0 0 0 14:00 3 20.4 19.9 0.5 0 0 0 0 0 13:55 1 11.9 10.4 1.9 0 0 0 0 0.1 14:00 2 13 14.6 2.2 0 0 0 0 0.1 14:05 3 14.5 15.8 2.1 0 0 0 0 0.1 15:30 1 8.3 8.9 4.9 0 0 2 0 0.6 15:35 2 9.9 10.1 4.9 0 0 1 0 0 15:40 3 10.9 10.5 4.8 0 0 1 0 0.1 9:15 1 14.2 14.4 3.6 0 0 0 0 0.8 9:35 2 13.8 15 4.2 0 0 0 0 0.6 9:40 3 14.3 14.4 4.2 0 0 0 0 0.8 14:05 1 21.1 20.4 0 0 0 0 0 0 14:10 2 21.3 20.5 0 0 0 0 0 0 14:15 3 21.3 20.5 0 0 0 0 0 0 13:40 1 21.2 20.8 0 0 0 0 0 0.1 13:45 2 21.5 21.1 0 0 0 0 0 0 13:50 3 21.4 21.7 0 0 0 0 0 0 15:50 1 20.3 20.3 0 0 0 0 0 0 15:55 2 20.1 20.2 0 0 0 0 0 0 16:00 3 20.2 20.2 0 0 0 0 0 0 09:20 1 20.8 20.9 0 0 0 0 0 0.4 09:25 2 20.9 20.9 0 0 0 0 0 0.2 09:30 3 20.9 20.9 0 0 0 0 0 0.2

10/25/2013 2/18/2014 5/21/2014 9/11/2014 10/25/2013 2/18/2014 5/21/2014 9/11/2014

10/25/2013

N/A

2/18/2014

Bldg 72 9/11/2014

5/21/2014

Ambient Air #2

(Bldg 72)

5/21/2014

5/21/2014

N/A

2 - 2.25

2 - 2.25

2/18/2014

No sample taken, water in VMP

Ambient Air #3

(Bldg 72) 9/11/2014

No sample taken, water in VMP

9/11/2014

No sample taken, water in VMP

No sample taken, water in VMP

No sample taken, water in VMP

No sample taken, water in VMP

2/18/2014

No sample taken, water in VMP

No sample taken, water in VMP

10/25/2013

2 - 2.5

2 - 2.25

VMP112

VMP113

VMP115

VMP114

Table 1: OU 7 Soil Vapor Monitoring Data - October 2013 - September 2014

Area Sample Location

Screened Interval Date Time Reading

Number O2 %

(Gem 2000) O2 %

(MultiRAE)

CO2 %

(GEM 2000)

CH4 %

(GEM 2000)

LEL%

(MultiRAE) H2S ppm

(MultiRAE) CO ppm

(MultiRAE) VOC ppm

(MultiRAE) 11:40 1 20.8 20.9 0 0 0 0 0 0 11:45 2 20.8 20.9 0 0 0 0 0 0 11:50 3 20.8 20.9 0 0 0 0 0 0 14:25 1 21.2 20.6 0 0 0 0 0 0 14:30 2 21.2 17.1 0 0.1 0 0 0 0 14:35 3 21.3 16.7 0 0 0 0 0 0 16:45 1 20.8 20.9 0 0 0 0 0 0 16:50 2 20.9 20.9 0 0 0 0 0 0 16:55 3 20.9 20.9 0 0 0 0 0 0 8:45 1 20.9 20.9 0 0 0 0 0 0 8:50 2 20.9 20.9 0 0 0 0 0 0 8:55 3 20.9 20.9 0 0 0 0 0 0 11:55 1 1.8 3 19.7 38.2 100 4.1 10 0.5 12:00 2 2.5 5.2 18.5 35.2 100 3.6 10 0.5 12:05 3 1.6 3.3 20 38.2 100 4.3 16 0.6 15:10 1 1.2 0 11.2 19.3 100 4.6 0 0.5 15:15 2 0.2 0 11.7 20 100 5 0 0.6 15:20 3 0.2 0 11.7 20 100 5.2 5 0.6 17:20 1 0.7 1.2 15.9 40.7 >100 12 23 0 17:25 2 0.2 0.3 16.5 41.3 >100 13 24 0 17:30 3 0.1 0.1 16.6 41.8 >100 14 38 0

10:15 1 1.3 7.7 23.8 48 OVER 12 14 0.7

10:25 2 1.4 7 24.3 48 OVER 13 31 0

10:29 3 1.3 6.7 24 47.7 OVER 15 39 0

12:10 1 1.4 6.1 17.5 36.9 100 3 40 0.2 12:15 2 4.1 5.9 15 30.6 100 3.3 42 0.4 12:20 3 0.8 3 17.9 37.4 100 5 52 1 14:45 1 0.6 0 10.7 22.4 100 4.6 5 0.6 14:50 2 0.3 0 11 22.1 100 4.8 4 0.6 14:55 3 0.1 0 11.1 21.9 100 5 5 0.6 17:05 1 0.2 6.1 18 38.6 >100 10 95 0.6 17:10 2 0.3 1.1 18.2 38.3 >100 11 100 0.6 17:15 3 0.9 1.1 17.5 37.4 >100 16 95 0.5

10:10 1 1.1 15 22.2 43.3 OVER 0 42 0.2

10:20 2 3.3 11.9 18.9 36 OVER 0 36 0

10:27 3 2.6 8.2 19.9 38.8 OVER 6 59 0

2.5 - 3

10/25/2013

10/25/2013

N/A

N/A

5.5 - 6

2/18/2014

2/18/2014

2/18/2014

5/21/2014

5/21/2014

10/25/2013

Northeastern Parking Lot

9/11/2014

Ambient Air #4

(Parking Lot) 9/11/2014

9/11/2014

5/21/2014

VMP111-6

VMP110-3

Ambient Air #1

(Parking Lot)

ATTACHMENTS

ATTACHMENT A: Graphs of Oxygen, Methane, and VOC Levels for OU 7 Soil Gas

OU 7 Soil Vapor Monitoring Data

Ambient Air #1, #4 Northeastern Parking Lot

10/3/2013 11/22/2013 1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm (MultiRAE)

VMP110-3

Northeastern Parking Lot

10/3/2013 11/22/2013 1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm

VMP111-6

Northeastern Parking Lot

10/3/2013 11/22/2013 1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm

Ambient Air #2, #3 (Bldg 72) Bldg 72

1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm

VMP112

Bldg 72

10/3/2013 11/22/2013 1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm

VMP113

Bldg 72

10/3/2013 11/22/2013 1/11/2014 3/2/2014 4/21/2014 6/10/2014 7/30/2014 9/18/2014 11/7/2014

CH4 %

(GEM 2000)

LEL%

(MultiRAE)

O2 % (MultiRAE)

VOC ppm

ATTACHMENT B: Response to Comments

February 2014 Page 1 of 1

Government Review Comments Draft Quarterly Vapor Monitoring Technical memorandum (September 2014) for Operable Unit 7

Defense Supply Center Richmond, Virginia Prepared by AECOM, June 2015

Contract: W912BV-10-D-2006, Task Order 0014

1. Commentator Agrees (A) with response, or Does not Agree (D) with response.

Comment

Page / Section Comment Response A or

D(1) U.S. EPA Comments – Sue Haug

1 General At the Northeast Parking Area, high levels of methane were detected at VMPs 110-3 and 111-6. According to the report, these VMPs are downgradient from an area where emulsified vegetable oil has been injected, and the methane gas production is a common byproduct of this process.

Please revise the report to include whether the concentrations of methane, carbon dioxide, etc., are to be expected in this location and what concentrations of the measured compounds would trigger concern or an action.

Section 4 has been revised to clarify how concentrations present at the Northeastern Parking Area will be assessed following quarterly monitoring events.

2 General The report concludes that the data do not suggest the need to escalate the efforts to sampling via EPA Method TO-15 sampling. However, the report does not state the criteria that would trigger more intensive sampling. Please revise the report to include a description of the criteria and also include that in future reports.

Section 4 has been revised to include discussion of criteria for collection of samples for laboratory analysis.

VDEQ Comments – Jim Cutler 1 General It is stated on page 3 that LEL readings were found to be higher that 100%. Assuming that these levels are resulting from the injections in this area are there any contingencies for dealing with these levels. Would any utility lines be impacted?

Section 4 has been revised to clarify the approach to methane concentrations in the Northeastern Parking Area. There are no known utilities in the vicinity of VMP-110 or VMP-111.