United States Air Force Joint Base Elmendorf-Richardson Alaska

UNITED STATES AIR FORCE JOINT BASE ELMENDORF-RICHARDSON ALASKA

ENVIRONMENTAL RESTORATION PROGRAM

REMEDIAL ACTION COMPLETION REPORT TU102 – BUILDING 987 UST/AST SITE

FINAL

JULY 2014

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FINAL

REMEDIAL ACTION COMPLETION REPORT TU102 – BUILDING 987 UST/AST SITE

JOINT BASE ELMENDORF-RICHARDSON, ALASKA

Prepared for Air Force Civil Engineer Center

Contract No. FA8903-09-D-8589 / Task Order 0016

JULY 2014

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TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

TABLE OF CONTENTS

Section Page

LIST OF ABBREVIATIONS AND ACRONYMS ...... iii

1.0 INTRODUCTION...... 1

2.0 SUMMARY OF SITE CONDITIONS ...... 1 2.1 Site Location and Background Information ...... 1 2.2 Release/Response Background ...... 2 2.2.1 Nature of Release ...... 2 2.2.2 Response Action History ...... 2 2.2.3 Summary ...... 4

3.0 DESCRIPTION OF SELECTED REMEDY ...... 6 3.1 Soil Vapor Extraction ...... 7 3.2 Groundwater Monitoring ...... 7 3.3 Asphalt Cap ...... 7 3.4 Land Use Controls ...... 7

4.0 BASIS FOR RESPONSE COMPLETE...... 8

5.0 REFERENCES ...... 9

6.0 CONCURRENCE ...... 10

Tables

2-1 TU102 Location Information ...... 1 2-2 Exposure Pathway Evaluation ...... 6

Figures

1 Site TU102 Location – Former Building 987 2 Historical Petroleum Hydrocarbons in Soil – Former Building 987 3 DRO, GRO, and Benzene in Groundwater – Former Building 987

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska i Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

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Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska ii Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

LIST OF ABBREVIATIONS AND ACRONYMS

µg/L microgram(s) per liter JBER-E former Elmendorf Air Force Base AAC Alaska Administrative Code JBER-R JBER-Richardson ADEC Alaska Department of Environmental Conservation LUC land use controls AST aboveground storage tank mg/kg milligram(s) per kilogram bgs below ground surface BTEXN benzene, toluene, NAD North American Datum ethylbenzene, xylenes, and naphthalene PAH polycyclic aromatic hydrocarbon COC contaminant of concern PID photoionization detector COPC contaminant of potential concern RACR remedial action completion report DRO diesel-range organics RC response complete ft/ft feet per foot SVE soil vapor extraction

GIS geographic information USACE U.S. Army Corps of Engineers system USAF United States Air Force GRO gasoline-range organics UST underground storage tank UTM Universal Transverse Mercator IC institutional control VOC volatile organic compound JBER Joint Base Elmendorf- Richardson

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska iii Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

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Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska iv Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

1.0 INTRODUCTION

The purpose of this remedial action completion report (RACR) is to summarize the current status of TU102 – Building 987 UST/AST Site (TU102) and to document concurrence with TU102 being adequately characterized and considered suitable for a “Cleanup Complete with Institutional Controls (ICs)” designation or response complete (RC). Soil vapor extraction (SVE) and an asphalt cap have been implemented as remedial actions at TU102. Diesel-range organics (DRO), gasoline- range organics (GRO), benzene, toluene, ethylbenzene, xylenes, and naphthalene (BTEXN), and polycyclic aromatic hydrocarbons (PAHs) (benzo(a)anthracene, benzo(b)fluoranthene, benzo(a)pyrene, and 2-methylnapthalene) remain in soil above Alaska Department of Environmental Conservation (ADEC) migration to groundwater cleanup levels; and PAHs remain in shallow soil above ADEC direct contact cleanup levels. No compounds have been detected in groundwater above Table C cleanup levels since 2004, and the 2013 groundwater monitoring event satisfied ADEC’s comments on the 2011 Groundwater Monitoring and Borehole Sampling (CH2M HILL, 2012). ADEC concurs with ceasing the groundwater monitoring program at TU102. The cap and land use controls (LUCs) for soil will remain in place. The United States Air Force (USAF) is managing remediation of contamination at TU102 in accordance with ADEC’s Contaminated Sites cleanup rules (Title 18, Chapter 75 of the Alaska Administrative Code [18 AAC 75], Sections 325 to 390).

2.0 SUMMARY OF SITE CONDITIONS

2.1 Site Location and Background Information

TU102 – Building 987 UST/AST Site is located at Joint Base Elmendorf-Richardson (JBER), adjacent to the Municipality of Anchorage, Alaska. JBER comprises the former Fort Richardson Army Post (referred to as JBER-Richardson [JBER-R]) and the former Elmendorf Air Force Base (JBER-E). TU102 is located northeast of the intersection of Otter Lake Road and Warehouse Street, approximately 1.7 miles north of Otter Lake in the northwestern portion of JBER-R (Figure 1). Detailed location information is provided in Table 2-1.

Table 2-1: TU102 Location Information

Estimated Northing Easting Reference Point Scale of Map Accuracy and (NAD 83 (NAD 83 for Which the Used to Associated UTM UTM Zone Date of Coordinates Acquire Unit of Zone 6N) 6N) Collection Method of Collection Were Established Coordinates Measure 61.265242 -149.716985 2/28/13 Esri Arc GIS conversion Center of Site Not applicable Not applicable tool “Feature to Point” Boundary to select centroid of polygon site boundary on file. Notes: GIS = geographic information system NAD = North American Datum UTM = Universal Transverse Mercator

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska 1 Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

TU102 was a former fuel-handling facility consisting of the following: (1) three fuel aboveground storage tanks (former ASTs), (2) former fuel pump house (Building 987 pump house waste fuel underground storage tank [UST] and piping), and (3) former truck stand and valve station. The three 225,000-gallon ASTs (Tank 56 – diesel, Tank 57 – diesel, and Tank 58 – motor gasoline) were used from the early 1950s until 1993, and the ASTs were removed in 1999 along with the pump house, truck stand/valve station, and 1,560 feet of 4-inch fuel piping. The 300-gallon “slop tank” UST (#45) replaced a former dry well at the same location and was used to store overflow fuel and arctic diesel fuel. The UST was used from the 1970s until 1990, when the tank and piping were removed and were reported to be leaking; and the UST was replaced by a 1,000-gallon UST (#45A) that has since been removed. A former railroad off-loading area, where releases occurred during transfer of fuel, is located to the southeast of the former fuel pump house. Currently, the site is paved and used as a storage area for recreational vehicles.

In the vicinity of TU102, groundwater occurs in an unconfined aquifer and is approximately 120 feet below ground surface (bgs). Groundwater flow is complex because of the nature of the geology; however, the general groundwater flow direction is historically toward the northwest with a hydraulic gradient of 0.003 feet per foot (ft/ft). The aquifer is comprised of primarily poorly graded gravel with sand (U.S. Army Corps of Engineers [USACE], 1998).

DRO, GRO, BTEX, and PAHs (benzo(a)anthracene, benzo(b)fluoranthene, and benzo(a)pyrene) are identified as contaminants of concern (COCs) in soil because residual concentrations based on historical data collected in 1999 (USACE, 1999) and 2001 (USACE, 2001), as well as most recent data collected in 2011 (CH2M HILL, 2012), are above ADEC Table B2 Method Two – Petroleum Hydrocarbon Soil Cleanup Levels, Migration to Groundwater. PAHs in shallow soil are also above ADEC’s Direct Contact Cleanup Levels. No analytes have been detected in groundwater above 18 AAC 75 Table C groundwater cleanup levels since 2004 (CH2M HILL, 2014).

2.2 Release/Response Background

2.2.1 Nature of Release

Petroleum hydrocarbons in soil and groundwater resulted from spills from the former ASTs, subsurface releases from the “slop tank” UST or the former dry well, leaks from underground fuel pipelines, and surface spills. DRO, GRO, BTEXN, and PAHs (benzo(a)anthracene, benzo(b)fluoranthene, benzo(b)pyrene, and 2-methylnapthalene) remaining in soil at concentrations above ADEC cleanup levels were detected at the following four general areas: (1) former ASTs, (2) former fuel pump house, (3) former truckfill stand/valve station, and (4) former railroad off-loading area (Figure 2). DRO, GRO, benzene, and 1,2-dichloroethane were historically detected in groundwater at concentrations above ADEC cleanup levels, although they have been below ADEC cleanup levels since 2004.

2.2.2 Response Action History

Investigations and a remedial action were completed for the former 300-gallon “slop tank” UST from 1990 through 1997. In 1990, the 300-gallon UST was removed at Building 987 and was replaced by a 1,000-gallon UST (USACE, 1993). During removal, contaminated soil was encountered in the excavation, indicating that the UST had been leaking or had overflowed. In

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska 2 Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

1991, a site investigation determined that petroleum hydrocarbons were present in site soils; a follow-up investigation in 1993 indicated that groundwater was also contaminated (USACE, 1993). Between 1993 and 1996, a total of eight monitoring wells were installed and sampled (AP-3233, AP-3235, AP-3460, AP-3461, AP-3462, AP-3463, AP-3474, and AP-3699) (USACE, 1998).

In 1997, an SVE system was installed to remove BTEX from vadose zone soil at the location of the former USTs (USACE, 1998). The objective of the SVE system was to reduce contaminant concentrations in the SVE offgas to a point of diminished returns (USACE, 1998). The system operated for 1 year and removed more than 2,250 pounds of volatile compounds. Because monitoring results demonstrated diminishing removal rates, the system was shut down in August 1998 (USACE, 1999).

Investigations were completed for the three fuel ASTs, fuel pump house, truck stand/valve station, and associated underground pipeline from 1999 through 2011. In 1999, the ASTs, fuel pump house, truck stand/valve station, and associated underground pipeline were removed from the site (Shannon & Wilson, 1999), and the entire fenced area was paved and converted to a parking lot/vehicle storage area (USACE, 1999). Confirmation samples collected in 1999 indicated that petroleum hydrocarbons (DRO, GRO, BTEXN, and PAHs) remained in soil above cleanup levels throughout the site from 0.5 to 4 feet bgs. Arsenic (3.23 milligrams per kilogram [mg/kg]) and chromium (38.4 mg/kg) were also detected above cleanup levels near the ASTs (USACE, 1999); however, these concentrations are within the background range for Alaska Surficial soils (CH2M HILL, 2013).

In 2001, two new potential releases were identified near the former truck stand/valve station (AP-4167) and the former railroad off-loading area (AP-4171) (USACE, 2001). Maximum concentrations of DRO (2,600 mg/kg) and GRO (1,000 mg/kg) were detected in soil above cleanup levels from 20 to 35 feet bgs (USACE, 2001). 2-methylnapthalene (34 mg/kg) was also detected in soil above cleanup levels at 20 feet bgs near the former pump house (AP-4164) (USACE, 2001). In 2002, two additional monitoring wells were installed (AP-4342 and AP-4343) (USACE, 2003).

In 2011 at the request of ADEC, soil samples were collected from four soil borings near former AST 57, the former truck stand/valve station, and the former Building 987 pump house, as well as from the location of replacement monitoring well AP-5681 from near surface to 119 feet bgs (Figure 2). Sample collection was based on depths of historically high contaminant concentrations and field screening (visual, olfactory, and photoionization detector [PID]) observations (CH2M HILL, 2012). Soil samples were submitted for analysis of DRO, GRO, petroleum-related volatile organic compounds (VOCs), and PAHs. Results indicate that residual petroleum hydrocarbons remain in soil above cleanup levels near the former railroad off-loading area at monitoring well AP-5681 and near the former pump house (AP-5688) at depths of 13 to 18 feet bgs and 43 to 48 feet bgs, respectively. Maximum concentrations of DRO (2,200 mg/kg), GRO (1,900 mg/kg), benzene (12 mg/kg), toluene (66 mg/kg), ethylbenzene (26 mg/kg), total xylenes (141 mg/kg), and 2-methlynapthalene (24 mg/kg) in soil were detected above their respective ADEC’s Method Two soil cleanup levels for migration to groundwater (CH2M HILL, 2012). Naphthalene, which had historically been present at the former pump house, was not detected above ADEC’s Method Two cleanup levels in 2011. DRO, GRO, petroleum-related VOCs, and PAHs were detected in soil from depths of 0 to 118 feet bgs near the former AST 57 and the former

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truck stand/valve station; however, all concentrations were below ADEC’s soil cleanup levels (CH2M HILL, 2012).

Between 1995 and 2013, long-term biennial monitoring of groundwater has been conducted. Since 2004, concentrations of DRO, GRO, petroleum-related VOCs, and PAHs have been below 18 AAC 75 Table C groundwater cleanup levels (CH2M HILL, 2014). In 2011, a replacement well for AP-3462 (AP-5681) was installed, and three groundwater monitoring wells (AP-3460, AP-4372, and AP-5681) were sampled for DRO, GRO, RRO, and BTEX. DRO was detected in groundwater at one monitoring well (AP-5681) with a concentration of 30 micrograms per liter (µg/L), which was below 18 AAC 75 Table C groundwater cleanup levels. GRO, RRO, and BTEX were not detected (CH2M HILL, 2012).

Four monitoring wells (AP-3460, AP-4371, AP-5681, and AP-3699) were sampled in 2013. The addition of monitoring well AP-3699 to the sampling schedule was in response to ADEC’s comments on the draft 2011 Groundwater Monitoring and Borehole Sampling (CH2M HILL, 2012). In addition, monitoring well AP-5681 was sampled and analyzed for GRO and BTEX. DRO was detected in all wells sampled with a maximum concentration of 37.7 µg/L, which is below ADEC groundwater cleanup levels. GRO (33.7 µg/L) was detected in one well (AP-5681) below cleanup levels. BTEX was not detected in any of the wells sampled (CH2M HILL, 2014). Historical and 2013 groundwater data are presented on Figure 3.

Depth to groundwater was measured at wells AP-5681, AP-4372, AP-3652, AP-3649, and AP-3463 in August 2013. Depth to groundwater was not measured at wells AP-3699 and AP-4360 because dedicated pumps in those wells prevented access with the water level meter. An attempt was made to measure the water level in AP-3474; however, this well could not be relocated and is presumed to have been abandoned. Because the recent survey data were available for wells AP-3652, AP-3649, and AP-3463, these wells were used to calculate the groundwater flow direction and the hydraulic gradient. This resulted in an approximate northwesterly groundwater flow direction and an approximate gradient of 0.002 ft/ft. This is consistent with groundwater flow directions in the nearby sites of TU058 – Building 762 and Building 786, and DA089 – Operable Unit E Armored Vehicle Maintenance Area (CH2M HILL, 2014).

In 1999, the site was capped with asphalt for use as a storage lot and to prevent dispersal of contaminated surface soil and infiltration of water through the contaminated zone and leaching/spreading of contamination to lower levels (Shannon & Wilson, 1999). LUCs are in place at the site to prevent access and exposure to contaminated groundwater and soil (ADEC, 2013). LUC inspections are conducted on a biennial basis. The 2013 inspection indicates that ICs are in place and adequate (CH2M HILL, 2014).

2.2.3 Summary

DRO, GRO, petroleum-related VOCs, and PAHs were historically detected in soil near the former ASTs, former fuel pump house, former truckfill stand/valve station, and former railroad off-loading area at concentrations above ADEC Method Two soil cleanup levels. An SVE system that operated near the USTs in 1997 addressed residual BTEX in vadose zone soil. The site was subsequently capped and converted into a recreational vehicle storage area in 1999.

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Based on 2001 data, DRO and GRO were detected in soil from 20 to 35 feet bgs at the former railroad off-loading area. 2-methylnapthalene was also detected in soil at 20 feet bgs at the former pump house. Concentrations at these locations were above their respective ADEC Method Two soil cleanup levels for migration to groundwater: DRO (2,600 mg/kg), GRO (1,000 mg/kg), and 2-methylnapthalene (6.1 mg/kg).

Data from the most recent soil samples collected in 2011 indicate that the following residual petroleum hydrocarbons remain in soil at the pump house at concentrations above their respective ADEC Method Two soil cleanup levels for migration to groundwater: DRO (2,200 mg/kg), GRO (1,900 mg/kg), benzene (12 mg/kg), toluene (66 mg/kg), ethylbenzene (26 mg/kg), total xylenes (141 mg/kg), and 2-methylnapthalene (24 mg/kg). DRO and GRO remain in soil from 43 to 48 and 118 to 119 feet bgs, respectively, and BTEX in soil remains from 43 to 48 feet bgs. DRO (1,800 mg/kg) was also detected from 13 to 18 feet bgs near the former railroad off-loading area during the installation of replacement monitoring well AP-5681 in 2011.

Based on 2011 data, petroleum hydrocarbons were not detected above screening levels in soil at the former AST 57 or at the former truckfill stand/valve station. This suggests that the product has either weathered further, volatilized, degraded, or was potentially removed during capping activities performed in 1999. Data collected in 1999 indicate that concentrations of PAHs (near AST 56) are present in soil above ADEC’s direct contact cleanup levels, and that concentrations of DRO, GRO, and benzene (near ASTs 56 and 58) exceeding migration to groundwater soil cleanup levels extend from the surface to 3.5 feet bgs.

DRO, GRO, BTEX, and 1,2-dichloroethane were also historically detected in groundwater above cleanup levels at the site. Groundwater monitoring performed at the site since 1993 has indicated that concentrations have decreased substantially. No compounds have been detected above 18 AAC 75 Table C groundwater cleanup levels since 2004.

Potential exposure pathways through which people, animals, and plants might come into contact with contaminants at this site were evaluated in accordance with the October 2010 ADEC Policy Guidance on Developing Conceptual Site Models. The results of this evaluation are presented in Table 2-2.

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Table 2-2: Exposure Pathway Evaluation

Pathway Result* Explanation Direct contact Pathway potentially Benzo(a)anthracene, benzo(b)fluoranthene, and benzo(a)pyrene were detected in complete soil (3.5 feet bgs) above direct contact cleanup levels; however, LUCs and an asphalt cap prevent contact. Inhalation – outdoor air Pathway incomplete Concentrations of DRO, GRO, and BTEX in soil at depths from surface to 30 feet bgs are below inhalation cleanup levels; therefore, the pathway is considered incomplete for current commercial/ industrial and potential future residential land use scenarios. The highest concentrations of DRO, GRO, and BTEX were detected at depths greater than 30 feet bgs (43 to 119 feet bgs). Inhalation – indoor air Pathway incomplete Because concentrations of BTEX exceeding their respective inhalation cleanup (vapor intrusion) levels were detected at depths greater than 30 feet bgs (43 to 119 feet bgs), the pathway is considered incomplete for a current commercial/ industrial land use scenario and for a future residential land use scenario. Groundwater ingestion Pathway incomplete Ship Creek serves as the main source of drinking water for JBER-R. There is no complete groundwater to surface water pathway. No COPCs have been detected in groundwater above Table C cleanup levels since 2004. Surface water ingestion Pathway incomplete The nearest downgradient surface water body, Otter Lake, is approximately 1.7 miles north of the site. Wild foods ingestion Insignificant exposure The site is not used for hunting, fishing, or harvesting of wild or farmed foods; and such activities are not anticipated in the future. Contamination is below the root zone for plants or burrowing depths for animals (6-foot-thick soil cap in place over site). Exposure to ecological Insignificant exposure Petroleum hydrocarbon–contaminated soil is less than 0.5 acre (considered receptors insignificant). *Results: “Insignificant exposure” means the pathway is complete; however, receptors are unlikely to be affected by the minimal volume or concentration of remaining contamination. “Pathway incomplete” means contamination has no potential to contact receptors. “Pathway potentially complete” means contamination has the potential to contact receptors; however, controls are in place to prevent contact. Notes: The 18 AAC 75.341 Method Two, Tables B1 and B2 Under-40-Inch Zone, Migration to Groundwater Cleanup Levels provided in Table 1 are the most stringent criteria. COPC = contaminant of potential concern

3.0 DESCRIPTION OF SELECTED REMEDY

SVE, an asphalt cap, groundwater monitoring, and LUCs have been implemented at TU102. The cap and LUCs for soil will remain in place. This remedy was selected because DRO, GRO, BTEX, and 2-methylnapthalene remain in soil above ADEC migration to groundwater cleanup levels, and because PAHs (benzo(a)anthracene, benzo(b)fluoranthene, and benzo(b)pyrene) remain in shallow soil (based on 1999, 2001, and 2011 data) above ADEC direct contact and migration to groundwater soil cleanup levels, as follows:

• DRO in soil – 250 mg/kg (Table B2, migration to groundwater)

• GRO in soil – 300 mg/kg (Table B2, migration to groundwater)

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• Benzene in soil – 0.025 mg/kg (Table B1, migration to groundwater)

• Toluene in soil – 6.5 mg/kg (Table B1, migration to groundwater)

• Ethylbenzene in soil – 6.9 mg/kg (Table B1, migration to groundwater)

• Total xylenes in soil – 63 mg/kg (Table B1, migration to groundwater)

• 2-methylnapthalene in soil – 24 mg/kg (Table B1, migration to groundwater)

• Benzo(a)anthracene in soil – 4.9 and 3.6 mg/kg (Table B1, direct contact and migration to groundwater, respectively)

• Benzo(b)fluoranthene in soil – 4.9 and 12 mg/kg (Table B1, direct contact and migration to groundwater, respectively)

• Benzo(a)pyrene in soil – 0.49 and 2.1 mg/kg (Table B1, direct contact and migration to groundwater, respectively)

3.1 Soil Vapor Extraction

3.2 Groundwater Monitoring

Long-term biennial monitoring of groundwater was implemented in 1995. Since 2004, concentrations of DRO, GRO, petroleum-related VOCs, and PAHs have been below 18 AAC 75 Table C groundwater cleanup levels (CH2M HILL, 2014).

3.3 Asphalt Cap

An asphalt cap covering the entire site is in place at TU102. The site is also fenced, and access is limited by a locked gate. The asphalt cap limits infiltration of precipitation at the site.

3.4 Land Use Controls

LUCs are non-engineering methods by which access to contaminated soil is physically or administratively restricted or regulated, and/or the contamination is monitored. The institutional actions process options (such as land and deed or access restrictions) may be implemented in conjunction with other response actions.

LUCs at TU102 restrict soil excavation until concentrations of DRO, GRO, BTEX, benzo(a)anthracene, benzo(b)fluoranthene, and benzo(a)pyrene in soil are below soil cleanup

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levels (Figure 1 shows the LUC boundaries). The LUCs are designed to prevent resource use and prevent or control exposure at TU102 to protect human health and the environment.

The USAF ensures compliance with LUCs by conducting periodic monitoring and completing site inspections. Separate controls are in place and enforced by the USAF to prevent inappropriate soil and groundwater exposure at these sites. The USAF currently requires all projects resulting in soil disturbance of greater than 4 inches bgs to follow 3 Wing Instruction 32-1007, Safeguarding Utilities from Damage, dated August 20, 2010, and 673d Wing Instruction 32-7003, Land Use Control Management, dated May 19, 2011.

Both instructions require the proponent to obtain an approved Base Civil Engineer Work Clearance Request (673 WG Form 3) prior to conducting work on the Base. This form is also referred to as a dig permit. If excavation occurs in an LUC area, the USAF requires the submission of a Sampling and Analysis Plan. Results of the analysis are used to determine the correct disposition of soils excavated or water removed from the site.

The USAF is obligated to inform, monitor, enforce, and bind, where appropriate, authorized lessees, tenants, contractors, and other authorized occupants of LUCs impacting TU102.

The Base Master Plan will contain a map indicating site location, with restrictions on any invasive activities that could potentially result in exposure of contaminants. The LUCs will be documented in the USAF Real Property Records, Base Master Plan, Cleanup module of the Enterprise Environmental, Safety and Occupational Health – Management Information System (EESOH-MIS), and 673d Installation Restoration Program Records. This will include information about current land uses and allowed uses, geographic boundaries of the LUCs, biennial site inspection checklists with photo documentation, and LUC performance report submittals.

The USAF will notify ADEC of any violation of the LUCs or any other activity that is inconsistent with the LUCs or LUC objectives, as well as any obstacles to correcting violation. The USAF must notify ADEC as soon as practicable, but no longer than 10 days after discovery, of any activity that violates or is inconsistent with the LUC objectives or use restrictions, or any other action that may interfere with the effectiveness of the LUCs. The USAF must take prompt measures to correct the violation or deficiency and prevent its recurrence. In this notification, the USAF will identify any corrective measures it has taken or any corrective measures it plans to take and the estimated time frame for completing them. For corrective measures taken after the notification, the USAF shall notify ADEC when the measures are complete.

The USAF will not modify or terminate LUCs or modify land uses that may impact the effectiveness of the LUCs or take any anticipated action that may disrupt the effectiveness of the LUCs or any action that may alter or negate the need for LUCs without seeking and obtaining approval and/or review and comment from ADEC 45 days prior to the change of any required modification.

4.0 BASIS FOR RESPONSE COMPLETE

The USAF has determined that TU102 is considered suitable for a “Cleanup Complete with ICs” designation or RC based on the following information:

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson, Alaska 8 Task Order No. 0016 TU102 – Building 987 UST/AST Site Remedial Action Completion Report July 2014

• The SVE system achieved the objective of reducing contaminant concentrations to a point of diminished returns and was shut down in August 1998.

• The asphalt cap achieved the objective of preventing dispersal of contaminated surface soil and infiltration of water through the contaminated zone and leaching/spreading of contamination to lower levels.

• Residual petroleum hydrocarbons (DRO, GRO, BTEXN, and PAHs [benzo(a)anthracene, benzo(b)fluoranthene, benzo(a)pyrene, and 2-methylnapthalene]) remain in soil above ADEC’s Table B1 and B2 cleanup levels at the site.

• No compounds have been detected in groundwater above Table C cleanup levels since 2004. It is recommended that the groundwater monitoring program at TU102 is ceased.

• LUCs and the cap will continue to limit the use and/or exposure to soil at the site. LUC inspections are conducted on a biennial basis. The 2013 inspection indicates that ICs are in place and adequate (CH2M HILL, 2014).

5.0 REFERENCES

Alaska Department of Environmental Conservation (ADEC). 2013. Cleanup Chronology Report for JBER-Ft Rich Bldg 987 AST 990 UST 45 USTA 2 Party TU102. Last updated on May 17, 2013. _http://www.dec.state.ak.us/Applications/SPAR/CCReports/ Site_Report.aspx?Hazard_ID=1487. Web site accessed on August 30. CH2M HILL. 2014. 2013 Annual Report – State Regulated Sites. Final. April. CH2M HILL. 2013. Preliminary Assessment/Site Inspection Report. SA034- Powerline Drum Site. Joint Base Elmendorf-Richardson, Alaska. Final. September. CH2M HILL. 2012. 2011 Groundwater Monitoring and Borehole Sampling, Two Party Agreement Sites: Buildings 28-008 & 5900 and Former Buildings 987, 762 & 786, JBER-Richardson. Final. September. Shannon & Wilson. 1999. Environmental Monitoring Report, Aboveground Storage Tank and Pipeline Demolition, Fort Richardson, Alaska. December. U.S. Army Corps of Engineers (USACE). 2003. Chemical Data Report: Two Additional Monitoring Wells, Building 987 Site, Fort Richardson, Alaska. January. U.S. Army Corps of Engineers (USACE). 2001. Building 987 Site Investigation Chemical Report, Fort Richardson, Alaska. Summer. U.S. Army Corps of Engineers (USACE). 1999. Technical Memorandum; Status of Soil Vapor Extraction at Building 987, Fort Richardson, Alaska. U.S. Army Corps of Engineers (USACE). 1998. Soil Vapor Extraction System Installation, Maintenance and Monitoring, Building 987, Fort Richardson, Alaska. September. U.S. Army Corps of Engineers (USACE). 1993. Building 987, Fort Richardson, Alaska.

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6.0 CONCURRENCE

This signature sheet documents the United States Air Force determined that TU102 at Joint Base Elmendorf-Richardson, Alaska has achieved "Cleanup Complete with ICs" (response complete). The site has been adequately characterized under 18 AAC 75.335, and LUCs and the cap will remain in place for soil. This determination may be reviewed and modified in the future if additional information becomes available that indicates that the presence of contaminants or exposures at TU l 02 causes an unacceptable risk to human health or the environment Jn this case, the United States Ajr Force will conduct additional actions to meet the requirements of the current site cleanup rules in effect at that time.

::7IDk,~ ~ra!:!M~agcr Date Air Force Civil Engineer Center

This signature documents that the Alaska Department of Environmental Conservation concurs that TU I 02 at Joint Base Elmendorf-Richardson, Alaska has achieved "Cleanup Complete with I Cs."

Louis Howard, Project Manager Date ADEC Contaminated Sites Program

Performance-based Remediation (PBR) Contract No. FA8903-09-D-8589 Joint Base Elmendorf-Richardson. Alaska 10 TaskOrder No. 0016

Figures

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NOTES: E 1. Features digitized from Not-To-Scale elements. 45715 a 2. Coordinate System: UTM Zone 6, WGS84, meters. g l e 45718 Ri ver Otter Lake

45703

UV ¬ 45725 LOOP AREA ACCESS ROADS Glenn Hwy S h ip C 992 r eek

994

OTTER LAKE ROAD

CIRCLE DRIVE 45726

45727

ACCESS ROAD

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Former 991 + AST 58 822

+ 45753

+ Former 821 990 Former Building 987 45752 + AST 57 Pump House

LAHUNCHICK ROAD + 820 + 987 THOMAS ROAD

+ Former 989 + AST 56

+ Former Railroad Former Truck Fill + Off-loading Area

Pipeline Stand/Valve Station +

!( !( !( Fence +

+ Railroad 988

+ + Land Use Control Boundary + + +

Groundwater, Soil +

+ + + + + + + + + + + + + + + + + + + + + + + WAREHOUSE STREET Aboveground Storage Tank (Demolished) Building (Facility ID) 955 Demolished Structure General Groundwater Flow 45680 ¬ Direction (Approximate) 984 Aero-Metric Image, Copyright © 2010

Figure 0 75 150 300 450 Feet Remedial Action Completion Report, TU102, Former Building 987 (CC-FTRS-02)

Date: 30 Jan 2014 Drawn by: srudolph R:\AFCEE_JBER_20001102\MapFiles\MOR\TU102\Figure_1_TU102_MOR_SiteMap.mxd 4 Joint Base Elmendorf-Richardson, Alaska E 45715 a NOTES: g 1. Features digitized from Not-To-Scale elements. l 45718 e R er 2. Coordinate System: UTM Zone 6, WGS84, meters. i v 3. 2-MN = 2-methylnaphthalene Otter DRO = diesel-range organics Lake GRO = gasoline-range organics feet bgs = feet below ground surface mg/kg = milligrams per kilogram 4. Historical data reflect maximum concentrations exceeding ADEC Method Two Cleanup Levels for each release45703 area at the site prior to 2011. 5. 2011 data include concentrations exceeding ADEC Method Two Cleanup Levels only. 45725 UV

Glenn Hwy S h ip C 992 r eek

¬ ACCESS ROAD 994 Depth DRO GRO Benzene Toluene Ethylbenzene Xylene 2-MN

OTTER LAKE ROAD (feet bgs) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) 45726 43-48' 2,200 1,900 12 66 26 141 24 118-119' 1,400 360

45727 Depth DRO GRO Benzene Depth GRO Benzene Toluene Ethylbenzene Xylene (feet bgs) (mg/kg) (mg/kg) (mg/kg) (feet bgs) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) 1.5' 608 344 0.304 0.5' 7,280 114 1,040 298 1,551

Former CIRCLE DRIVE AST 58 Depth DRO Depth GRO Napthalene

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + (feet bgs) (mg/kg) (feet bgs) (mg/kg) (mg/kg) ! 3.5' 10,500 No Exceedances + 1.5' 8,380 64 822 + 991 45753 45752 +

+ Former Former Building 987

+ AST 57 Pump House + 821

+ ! Depth Benzo(a)anthracene Benzo(b)fluoranthene Benzo(a)pyrene + 990 !

LAHUNCHICK ROAD + (feet bgs) (mg/kg) (mg/kg) (mg/kg) ! 987 ! ! Depth DRO 820 3.5' 10.40 14.50 7.250 + (feet bgs) (mg/kg)

+ ! 3.5' 9,950 +

+ Former ! Former Truck Fill + 989 Former Railroad AST 56 Stand/Valve Station + ! Off-loading Area

2011 Soil Sample Location + 988 THOMAS ROAD ! + Historical Soil Sample Location !

+ !( !( !( Fence Depth DRO + Depth DRO GRO WAREHOUSE STREET Railroad

(feet bgs) (mg/kg) +

+ (feet bgs) (mg/kg) (mg/kg)

+ + + + + + + + + + + + + + + + + + + + +

+ Land Use Control Boundary + + + + + 3.5' 16,300 20' - 1,000 Groundwater, Soil 35' 1,800 - Aboveground Storage Tank (Demolished) Depth 2-MN Building (Facility ID) (feet bgs) (mg/kg) No Exceedances 20' 34 Demolished Structure 45680 955 Depth DRO General Groundwater Flow 984 (feet bgs) (mg/kg)

Figure 0 75 150 300 450 Feet Remedial Action Completion Report, TU102, Former Building 987 (CC-FTRS-02)

Date: 20 Feb2014 Drawnby: srudolph R:\AFCEE_JBER_20001102\MapFiles\MOR\TU102\Figure_2_TU102_MOR_Soil.mxd 4 Joint Base Elmendorf-Richardson, Alaska E GENERAL NOTES: a g 1. Coordinate System: UTM Zone 6, WGS84, meters. l e 2. All results in µg/L (micrograms/liter). Ri ver 3. Non-detect values are reported as practical quantitation limit (PQL). Otter 4. Regulatory Exceedances of Cleanup Levels are in Red, italicized bold. 5. Groundwater levels collected during 2013 sampling event. Lake ¬ LADUE ROAD 6. The detection of toluene, ethylbenzene and xylenes in 2007 may be attributed to inadequate decontamination between wells. 7. Groundwater cleanup levels are from Alaska Department of Environmental Conservation 18 AAC 75.345 (4/2012) Table C. ;& AP-3463 8. Abbreviations ADEC Alaska Department of Environmental Conservation 184.35' A Hydrocarbon response is diesel range but does not resemble diesel. AP-4372 B The analyte was detected in the associated method and/or Date DRO Benzene Toluene Ethylbenzene Xylenes UV calibration blank. CIRCLE DRIVE 6/4/2004 424 ND (0.5) ND (2) ND (2) ND (4) DRO Diesel range organics. AP-3460 EH Compound quantitated at a 5X dilution factor. 10/1/2005 89.5 ND (0.15) ND (0.62) ND (0.62) ND (0.62) Date DRO Benzene Toluene Ethylbenzene Xylenes J The analyte was positively identified, and the quantitation is an 7/7/2007 ND (50.0) ND (0.2) 0.75 ND (0.2) 0.38 J Glenn Hwy estimation because of discrepancies in meeting certain analyte-specific 7/1/1996 ND (250) ND (1) ND (1) ND (1) ND (1) S h quality control criteria. Or the analyte was positively identified, but the 6/30/2008 ND (50) ND (1.0) ND (1.0) ND (1.0) ND (2.0) ip 6/1/1998 ND (250) ND (1) ND (1) ND (1) ND (1) C associated concentration is estimated above the MDL and below the 6/5/2009 ND (57) ND (1.0) ND (1.0) ND (1.0) ND (2.0) r 7/1/1999 ND (250) ND (1) ND (1) ND (1) ND (1) eek limit of quantitation (LOQ). 12/1/2010 ND (510) ND (0.240) ND (0.620) ND (0.620) ND (1.86) MCL Maximum Contaminant Level (ADEC Chapter 75, Section 345, 6/4/2004 ND (306) ND (0.5) ND (2) ND (2) ND (4) 8/11/2011 ND (68) ND (0.2) ND (0.2) ND (0.2) ND (0.8) Table C). 10/5/2005 113 ND (0.15) ND (0.62) ND (0.62) ND (0.62) 8/5/2013 25.8 B ND (0.25) ND (0.25) ND (0.25) ND (0.75) - Not available, not measured, or not sampled. 7/7/2007 ND (51) ND (0.2) 0.058 J ND (0.2) ND (0.6) NC Groundwater elevation not calculated due to lack of recent survey data. 7/1/2008 ND (50) ND (1.0) ND (1.0) ND (1.0) ND (2.0) 45715 ND (0.053) Indicates Non-detect (MDL) or Non-detect (PQL). 6/5/2009 ND (51) ND (1.0) ND (1.0) ND (1.0) ND (2.0) 45718 NM No measurement collected for groundwater due to dedicated 12/1/2010 ND (520) ND (0.240) ND (0.620) ND (0.620) ND (1.86) pump. 8/11/2011 ND (71) ND (0.2) ND (0.2) ND (0.2) ND (0.8) WELL-SPECIFIC NOTES: 8/5/2013 37.7 B ND (0.25) ND (0.25) ND (0.25) ND (0.75) AP-3474 could not be relocated during 2013 sampling event and is presumed to have been removed. 45703 A@ NC AP-3462 was not sampled since prior to the July 2007 sampling event NM A@ after a bent casing prevented access. AP-4343 was not sampled and water level not measured starting as of 45725 2010 because the casing was broken. d Approximate locations and data for AP-3233 & AP-3235 are from AP-3233 Chemical Data Report, Groundwater Study Fall 1995 Fort Richardson, Date DRO GRO Benzene 1,2-Dichloroethane Alaska. Alaska District, U.S. Army Corps of Engineers, Geotechnical 10/1/94 4,200 1800 120 - Branch, Materials & Instrumentation Section dated May 10, 1996. 992 Spring 1994 13,600 2,280 22 3.8 Fall 1994 9,200 3,000 55J 5J AP-3699 994 Spring 1995 2,000 1900 22J 2.3J Date DRO Benzene Toluene Ethylbenzene Xylenes

OTTER LAKE ROAD Fall 1995 2,100A 1500 38 EH 4.4 8/5/2013 37.3 B ND (0.25) ND (0.25) ND (0.25) ND (0.75)

CIRCLE DRIVE 45726 ;& 45727 NMA@

AP-3474a ACCESS ROAD ;& d Former AST 58 AP-3235

+ + + + + + + + + + + + + + + + + + + + + + + + + + + Date DRO GRO Benzene 1,2-Dichloroethane c + 991 10/1/93 4,200 1200 97 - AP-4343 822 + Date DRO Benzene Toluene Ethylbenzene Xylenes Spring 1994 8,390 640 5.4 2.4

+ Fall 1994 400 350 ND (2) ND (2) A@ Program Monitoring Well 10/1/02 94.4 ND(1) ND(1)45753 ND(1) ND(3) Former Building 987 Former AST+ 57 ?& Spring 1995 700 455 0.7J ND (0.5) 6/4/04 ND (309) ND(05) ND(2) ND(2) ND(4) Pump House 821

& + 990 10/1/95 900A 70 0.8 0.4J ? Non-Program Monitoring Well 10/5/05 153 ND(0.15) ND(0.62) ND(0.62)45752 ND(0.62) 7/7/07 30.0J ND(0.2) 0.78 0.07J 0.27J + & ;& Abandoned Monitoring Well ? 820 6/30/08 ND(54) ND(1.0) ND(1.0) ND(1.0) ND(2.0) + 987 !( !( !( 6/8/09 ND(56) ND(1.0) ND(1.0) ND(1.0) ND(2.0) Fence Former AST+ 56 AP-5681 (Replacement well for AP-3462) ACCESS TRAIL + 989 Date DRO GRO Benzene Toluene Ethylbenzene Xylenes Railroad THOMAS ROAD

+ 8/11/2011 30 J - ND (0.2) ND (0.4) ND (0.2) ND (0.8) Aboveground Storage 8/5/2013 32.7 B 33.7 J ND (0.25) ND (0.25) ND (0.25) ND (0.75)

Former Truck Fill + Tank (Demolished)

+ Stand/Valve Station

+ Land Use Control Boundary + A@& + + + ; b Groundwater, Soil DRO 1,500 + 988 185.18' AP-3462

GRO 2,200

+ + + + + + + + + Date DRO Benzene Toluene Ethylbenzene Xylenes + + + + + + Building (Facility ID) Benzene 5 + LAHUNCHICK ROAD 10/1/95 ND(250) ND(0.1) ND(0.1) ND(0.1) ND(0.1) Demolished Structure Toluene 1,000 ;& Ethylbenzene 700 AP-3649 6/4/04 ND(309) ND(0.5) ND(2) ND(2) ND(4) General Groundwater Flow Xylenes 10,000 955 10/5/05 63.9 ND(0.15) ND(0.62) ND(0.62) ND(0.62) ACCESS TRAIL WAREHOUSE STREET ¬ Direction (Approximate) 1,2-Dichloroethane 5 45680 Groundwater Elevation 984 164.82' (feet AMSL) * Alaska Department of Environmental Conservation ;& 18 AAC Chapter 75, Section 345, Table C. AP-3652 Aero-Metric Image, Copyright © 2010

Figure 0 62.5 125 250 375 Feet Remedial Action Completion Report, TU102, Former Building 987 (CC-FTRS-02)

Date: 31 Jan 2014 Drawn by: srudolph R:\AFCEE_JBER_20001102\MapFiles\MOR\TU102\Figure_3_TU102_MOR_GW-Monitoring.mxd 4 Joint Base Elmendorf-Richardson, Alaska