ABL Public Website - IR History

Overview of Installation History

This page contains an overview of the Installation History with a table listing the status of each site within the ABL IR Program.

Allegany Ballistics Laboratory (ABL) began comprehensive environmental restoration activities in the 1980s under the Navy Assessment and Control of Installation Pollutants (NACIP) and Installation Restoration Programs (IRPs). The purpose of the Navy's NACIP and IRP was to identify, assess, characterize, and clean up or control contamination from past waste management activities at Navy and Marine Corps facilities. Given the nature and extent of its operations, the Navy has been involved with toxic and hazardous materials for several decades. The Department of Defense (DoD), as well as general industry, have realized that previously acceptable methods of disposal are no longer sufficient and actions are being taken, through these programs, to clean up Navy sites that pose a threat to human health or the environment. Current Navy waste management operations are in compliance with all federal state, and U.S. Navy regulations to ensure safe operation and disposal.

The Plant 1 portion of ABL was proposed by USEPA for inclusion on the National Priorities List (NPL) in June 1993. The decision to list a particular site is determined on the basis of calculated risks to human health and the environment. The Plant 1 portion of ABL was added to the NPL at Federal Register, Volume 59, Number 27989, on May 31, 1994.

Following ABL’s listing on the NPL, negotiations on a Federal Facilities Agreement (FFA) between USEPA, the State of West Virginia, and the Department of Navy was initiated. Under the "Federal Facilities" section of the NPL, federal agencies are considered responsible for conducting most of the response actions at facilities under their jurisdiction. The FFA between USEPA Region III, West Virginia Department of Enviromental Protection (WVDEP), and the Navy was finalized in January 1998, as required by the National Oil and Hazardous Substances Pollution Contingency Plan (NCP).

Under the terms and conditions of the FFA, Site Screening Areas (SSAs) are required to be investigated and, if appropriate, remediated in accordance with the NCP, CERCLA, Superfund Amendments and Reauthorization Act (SARA), and RCRA. Such areas are designated in Appendix A of the FFA. Units that require additional documentation or sampling before a decision is made for no further action or inclusion as an SSA are classified as Areas of Concern (AOCs), or Appendix B units, in the FFA.

The table below lists the current status of ABL CERCLA Sites and SWMUs requiring further action in accordance with the Final FFA. A site description summary is provided in the sections following the table.

FFA Category	Site ID	Name and Description	Status	Path Forward
	SWMU 1	Former Hazardous Waste Storage Area I Late 1970s - 1981 Approximately 360-square-foot pad used for the storage of 55-gallon drums of hazardous waste prior to disposal off site. Soil at the site is considered part of IR Site 1	The RFA recommended no further action for this SWMU. A ROD for Site 1 groundwater remediation was signed in April 1997. Construction of a groundwater treatment plant for treatment of VOCs was completed and has been operational since September 1998.	Soil at the SWMU is currently under investigation as part of Site 1. Human health and ecological risk assessments are being updated for Site 1 soil and preliminary remediation goals (PRGs) will be established, as necessary.
	SWMU 2	Former Hazardous Waste Storage Area II 1981 - June 1990 Approximately 40-foot by 100-foot concrete pad designed to manage drums of waste from satellite accumulation areas throughout the plant prior to being shipped off site.	SWMU 2 was closed out in December 2004 via closeout report.
	SWMU 3	Current Hazardous Waste Storage Area June 1990 - present Concrete pad consisting of 40 individually diked and recessed concrete cells (maximum capacity 300 55-gallon drums) for the storage of hazardous wastes.	The RFA recommended no further action for this SWMU. This pad is permitted and managed under RCRA.	Hazardous waste management permit renewal and continued operation.
	SWMU 4 /IR Site 2	Former Burning Ground I 1942 - 1949 A former burning ground of approximately 20 feet by 40 feet (gravel covered surface), used for burning waste propellant components and explosives.	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI.	Additional groundwater investigations are in progress at IR Site 2. Supplemental soil and groundwater data will be used to update the human health and ecological risk assessments for IR Site 2. Results of the risk assessments will be presented in an RA/FS Report.
	SWMU 5 / IR Site 3	Former Burning Ground II 1950 - 1958 A former burning ground of approximately 40 feet by 200 feet (clay covered surface), used for burning reactive wastes consisting of propellants and explosives.	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI.	The human health and ecological risk assessments for IR Site 3 have been updated with supplemental investigation data. A draft combined RI/FS for Sites 3, 4B, and 10 will be submitted in 2004.
	SWMU 6	Current Burning Ground 1958 - present A fenced area measuring 280 feet by 1,250 feet, consisting of 13 current and former burning locations (pads). This SWMU is part of IR Site 1	This SWMU is being operated under an interim status hazardous waste management permit. In addition, a RCRA Part B permit application is currently being prepared for the Current Burning Ground. Soil and groundwater at this SWMU have been investigated as they pertain to IR Site 1. Historical investigations comprise the RI; Focused RI; Phase I and II Aquifer Testing; 1998 supplemental soil investigation; and 2001 supplemental soil, surface water, and sediment investigation. In addition, soil at the SWMU was investigated as part of the requirements for preparing the Part B permit application. A ROD for Site 1 groundwater remediation was signed in April 1997. Construction of a groundwater treatment plant was completed for treatment of VOCs and has been operational since September 1998.	Issuance of a Part B permit for hazardous waste management and continued operation.
	SWMU 7	Inert Burning Ground 1958 – 1985 Approximately 20-foot by 20-foot area located outside the fenced area of the current Burning Ground. The unit managed waste materials contaminated with explosives, including explosive contaminated waste rags. This SWMU is located within IR Site 1	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI. See remainder of discussion under SWMU 1.	See discussion under SWMU 1.
	SWMU 8	Acid Disposal Pits 1972 - 1982 Two unlined, crushed-limestone-filled, earthen pits approximately 20 feet by 5 feet in area and 4 feet in depth. Waste acids and bases generated by laboratory operations were poured into the pit and allowed to percolate through the limestone. This SWMU is located within IR Site 1	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI. See remainder of discussion under SWMU 1.	See discussion under SWMU 1.
	SWMU 9 / IR Site 5	Inert (Non-ordnance) Landfill 1964 - 1988 Landfill approximately 420 feet long, 110 feet wide, and 20 feet deep. This unit received empty drums, unknown lab and photographic chemicals, scrap metal and plastic, large quantities of broken fluorescent tubes containing mercury, sandblasting grit, wood products, construction debris, fiberglass, and other resin-coated fibers.	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI. A ROD was signed for soil and waste remediation on January 1997. Construction of a landfill cap was completed in October 1997. A long-term groundwater monitoring program was implemented at that time and currently is conducted on a tri-quarterly basis. A draft Focused RI Report for groundwater, surface water, and sediment was submitted in September 2003. A technical memorandum evaluating the results of the Site 5 MNA study was submitted in January 2004.	Remedial alternatives (including MNA) for groundwater, surface water, and sediment, as appropriate, are evaluated in an RI/FS expected submitted in 2004. The results of the FS will be used to prepare a PRAP and ROD.
	SWMU 10 / IR Site 7	Beryllium Landfill 1964 – late 1960s Earthen pit measuring approximately 10 feet by 10 feet in area and 6 feet in depth. A maximum of two pounds of beryllium and 100 pounds of excess lab chemicals were disposed of here.	A No Further Action ROD was signed in September 2001.
	SWMU 11	Former Burn Cages and Ash Landfill prior to 1970 until the 1970s Unit consists of an ash landfill and at least two burn cages. The landfill measures approximately 100 feet by 60 feet in area and 12 feet in depth. During the 1960s and 1970s the facility burned paper, cafeteria garbage, packaging materials, and non-explosive materials in open wire mesh cages. The ash generated from the burning was disposed at the landfill located adjacent to the cage areas. The landfill also contains demolition debris, empty solvent drums, and rocket motor casings. This SWMU is located within IR Site 1	The RFA recommended an RFI for this SWMU and that the RFI be coordinated with the ongoing activities of the RI. See remainder of discussion under SWMU 1.	See discussion under SWMU 1.
	SWMU 12	Former Alodine Treatment Tank 1978 – 1982 The unit was a 1,000-gallon, open-top, vertical cylinder. Industrial wastewater from the Alodine process (aluminum surface chemical conversion process) was pre-treated at the unit for chromium reduction and precipitation. As of 1980, 4,200 gallons of Alodine process wastewater were treated at this unit on a monthly basis. This SWMU is also part of IR Site 12	The RFA recommended no further action for this SWMU. AOC N was part of the Phase I Phase II and Phase III SWMU/AOC investigations. Based upon the results of the Phase III, AOC N has been redesignated as IR Site 12.	No further action is planned for SWMU 12, but further investigation continues for IR Site 12.
	SWMU 14	1991 - 1998 Current Alodine Waste Storage Area (no longer in use) Concrete area used to store Alodine waste and Alodine contaminated rags in 55-gallon drums. The unit measures approximately 20 feet by 10 feet. This SWMU is also part of IR Site 12	The RFA recommended no further action for this SWMU. The regulatory agencies agreed with this recommendation under the condition that possible releases from this tank be considered in the investigation of SWMU 52. AOC N was part of the Phase I, Phase II, and Phase III SWMU/AOC investigations. Based upon the results of the Phase III, AOC N has been redesignated as IR Site 12.	No further action is planned for SWMU 14, but further investigation is ongoing for IR Site 12.
	SWMU 16	Plant 1 Wastewater Treatment System 1962 - December 1996 Wastewater treatment plant which treated all of the facility’s sanitary wastewater along with some industrial wastes from photographic processing and several chemical laboratories. Approximately 1,500 gallons per month of filtered wastewater containing residual RDX (less than 100 mg/l), pre-treated wastewater from the Alodine process, and some water from oil/water separators was discharged to this unit. Also, a portion of the facility’s stormwater sewer system was routed to this unit from 1970 until 1984.	The RFA recommended that soil samples be collected in the overflow area. These samples were collected during the Phase II RI. The analytical results indicated that no analytes were detected above the EPA Region III RBC values. Confirmatory soil samples were collected from beneath the treatment plant when it was demolished in May 1998. The data suggested that releases did not occur beneath the treatment plant.	Based on the information above, no further action is planned for this SWMU.
	SWMU 18 / IR Site 4B	Photo Solution Discharge Area I 1959 - 1971 An unlined drainage ditch which received discharges of spent photographic and x-ray solutions from developing and processing operations. These solutions likely contained silver, cyanide, and phenol.	Surface soil samples were collected during a supplementary investigation in 2001. These data, together with historical and background data, were used to calculate PRGs for soil constituents at the Site. In November 2003, a soil removal pilot study removed the majority of the impacted soil at the site.	Additional excavation and confirmatory sampling will be completed in 2004. The results of the pilot study will be documented in a combined RI/FS for sites 3, 4B, and 10.
	SWMU 19 / IR Site 4A	Photo Solution Discharge Area II 1959 - 1965 Originally thought to have been a shallow gravel-lined pit (french drain) which received spent photographic and x-ray solutions from developing and processing operations. This SWMU was later determined not to have received any of these wastes.	The RFA recommended that soil samples be collected around the unit at Building 231. Possible releases from this area have been considered in the investigation of SWMU 26. The building drainage was always connected to the sewage treatment plant and soil testing has confirmed no release. The SWMU was closed out in FFA under Findings of Fact p 19.
	SWMU 20	Solvent Disposal Pit Unknown - 1978 Unlined earthen pit used for the disposal of explosive-contaminated solvents such as TCE, PCE, and 1,1,1-TCA. This SWMU is located within IR Site 1.	See discussion under SWMU 8.	See discussion under SWMU 8.
	SWMU 21	Building 241 Catch Basin 1960s - 1980s The unit managed water, which may have contained residual explosive materials from testing operations in the Building 241 bunker.	SWMU 21 was closed out in August 2001 via closeout report.
	SWMU 22	Incenerators 1942 - 1980s Comprises an explosive waste incinerator (SWMU 22A; 1942 - 1950s) which treated explosive wastes; classified document incinerator (SWMU 22B; 1942 - 1980s) for scrap paper; pilot fluidized bed incinerator (SWMU 22C; 1980s) for specially prepared propellant and explosive material; and non-explosive combustible incinerator (SWMU 22D; 1960s - 1970s) for facility refuse and non-explosive combustible materials. SWMUs 22C and 22D are part of IR Site 1. SWMU 22D is also SWMU 11.	SWMU 22 (22A, 22B, 22C, and 22D) was closed out in September 2000 via closeout reports.
	SWMU 23	Salvage Yard 1950s - present Unit managed scrap metals including aluminum and copper, also stored outdated equipment such as compressors, empty drums, and, at one point, spent automotive batteries.	SWMU 23 was closed out in September 2000 via closeout report.
	SWMU 24	Satellite Accumulation Areas [24A through 24BB] 1940s - present Several areas throughout the facility used to accumulate waste materials before they are transferred to the current hazardous waste storage area (SWMU 3). SWMU 24S is part of IR Site 12	SWMU 24G was deleted during the RFA. Based on the October 22, 1997 and the October 14, 1998 agency meetings, no further action was planned for SWMUs 24A, 24B, 24C, 24D, 24F, 24H, 24J through 24Q, 24U, 24W, 24Y, 24Z, 24AA, and 24BB. SWMUs 24J and 24V were closed out in September 2000 via closeout reports. SWMUs 24A, 24B, 24C, 24D, 24E, 24F, 24H, 24I, 24K, 24L, 24M, 24N, 24O, 24P, 24Q, 24R, 24T, 24U, 24X, 24Y, 24Z, 24AA, and 24BB were closed out in February 2002 via closeout reports. SWMU 24W was closed out in July 2002 via closeout report AOC N was part of the Phase I, Phase II, and Phase III SWMU/AOC investigations. Based upon the results of the Phase III, AOC N has been redesignated as IR Site 12.	Further action is planned for SWMU 24S under AOC N (See discussion under SWMU 12). No further action is planned for SWMU 24S but further investigation is ongoing for IR Site 12. No further action is planned for SWMU 24S, but further investigation at IR Site 12 (see further details under SWMU 12).
	SWMU 25	Solvent Recovery Stills [25A, 25B, and 25C] Various start-up dates from 1970s – mid-1990s Three solvent recovery stills located inside buildings 8 (25A), 167 (25B), and 256 (25C). All SWMUs managed methylene chloride still bottoms.	SWMU 25 (25A, 25B, and 25C) was closed out in February 2002 via closeout report.
	SWMU 26	Septic Tank 1940s - 1960s Unit managed primarily sanitary wastewater, but did manage some industrial wastewater generated from photographic processes and lab glassware washing.	The contents of the septic tank were characterized, removed, and disposed of as non-hazardous and the tank was closed in place by filling with inert material in 2001. SWMU 26 was closed out in July 2002 via closeout report.
	SWMU 27A	Plant 1 Drainage Ditch System 1940s - present A stormwater drainage system of open earthen drainage ditches, catch basins, and culverts throughout the facility. SWMU 27A includes SWMU 39	The RFA recommended collecting samples at certain points in the drainage ditch. Additional Plant 1sediment and surface water samples and background samples were collected in 2002 and 2003 as part of the Phase III SWMU/AOC Investigations.	It is anticipated that additional sediment samples will be collected from SWMU 27A and possibly from background locations to identify potential sources of inorganics and PAHs in the drainage system. A ecological site reconnaissance will be conducted to develop a conceptual model for the system. A continuing surface water and alluvial groundwater investigation encompassing the portion of SWMU 27A near the Range Rd/H Street intersection was initiated in 2002.
	SWMU 28	Silver Recovery Units Bldg. 181, 1971 - present Bldg. 300, 1960s – mid-1990s Two units that are used to reclaim silver from photographic and x-ray development waste.	SWMU 28 was closed out in February 2002 via closeout report.
	SWMU 29	Dust Collectors and Baghouses [29A through 29K] Various start-up dates from 1955 - present Comprises dust collection systems to collect material from grit blasting, grinding, and sanding. Boiler fly ash is collected in the SWMU 29K baghouse. RDX and HMX product are collected in the SWMU 29I baghouse and used for propellant manufacture.	SWMU 29 (29A through 29K) was closed out in February 2002 via closeout report.
	SWMU 30	Spray Booth Filters 1978-1995 The facility operates several paint and coating spray booths for painting and lining rocket motor cases, wooden signs, and other components.	SWMU 30 was closed out in February 2002 via closeout report.
	SWMU 31	Laboratory Waste Areas Prior to 1956- present Five-gallon plastic containers equipped with fitted lids, which are used to collect waste propellants from lab test areas to be taken to the Burning Grounds for disposal.	SWMU 31 was closed out in February 2002 via closeout report.
	SWMU 32	PCB Rags Storage Area 1970s - 1980s The unit managed one drum of PCB-contaminated rags and one drum containing a PCB capacitor. In addition, a drum containing PCB fluid used for topping off electrical equipment was stored at the site.	SWMU 32 was closed out in February 2002 via closeout report.
	SWMU 33	Dumpsters 1988 - present Leased side-loading and top roll-off dumpsters that receive non-hazardous general refuse.	SWMU 33 was closed out in February 2002 via closeout report.
	SWMU 34A and B	Oil/Water Separators for air compressors 1991 and 1992 – 2001 The primary waste managed by these units is waste lubricating oil from air compressors. The units separate the water from the oil and discharge the water through floor drains to the wastewater treatment plant (SWMU 16).	The SWMUs were part of the Phase II SWMU/AOC Investigation. Screening of the data suggest there is TPH levels in the soil and groundwater that require additional evaluation. The air compressor buildings associated with these SWMUs were demolished in 2003.	The foundations of former buildings 252 (SWMU 34A) and 341 (SWMU 34B) will be removed along with underlying potentially impacted soil. Alluvial groundwater wells may installed if excavation activities and soil date indicated this is necessary.
	SWMU 35	Paper Mulcher Waste Accumulation Area 1983 – 1998 A temporary storage area for paper mulch generated by the facility’s SEM Security Disintegrator machine.	SWMU 35 was closed out in February 2002 via closeout report.
	SWMU 36	Oil Pit 1960s – 1995 A below grade circular pit measuring 2 feet in diameter and 2 feet in depth. This unit contained a dark, highly viscous petroleum substance during the RFA site visit. This SWMU is part of IR Site 11	The RFA recommended that the integrity of the oil pit be evaluated, and if impaired, soil sampling should be performed. A 55-gallon drum filled with No. 5 fuel oil and adjacent soils were removed to clean the area. Confirmatory soil samples indicated no contamination. Additional soil samples were collected during the Advanced Site Inspection and the Site 11 RI. A draft RI report for Site 11 was submitted in November 2002.	A Pilot Study Work Plan and associated field activities are planned for 2004. Results of the pilot study will be included in a forthcoming FS.
	SWMU 37	Wastewater Sumps [37A through 37Q, 37S through 37X] 1940s – 1999 Currently 23 units have been identified. These units have received or have potentially received contact cooling water from propellant machining operations, building washdown water from structures at which solid explosives are processed, wastewater containing materials other than propellants and explosives, coolants, oil, solvents, Alodine wastewater, salts, sands, and sediment. SWMU 37N is part of IR Site 12 SWMU 41 is to be evaluated with SWMU 37B per FFA	SWMUs 37B, 37BB, 37C, 37E, 37F, 37G, 37J, 37N, 37T, 37U, 37V, 37W, and 37X were investigated during the Phase I and/or Phase II SWMU/AOC Investigation. SWMU 37N was investigated as part of AOC N. SWMUs 37C, D, E, T and U were removed in June 1998 SWMUs 37A, 37B, 37BB, 37N, 37V, and 37X were removed in 2000/2001. SWMUs 37H, 37K, 37M, and 37O were closed out in September 1999 via closeout reports. SWMUs 37C (soil), 37D (soil), 37I, 37L, and 37P were closed out in September 2000 via closeout reports. SWMUs 37C (groundwater), 37F, 37G, and 37S were closed out in September 2001 via closeout reports SWMU 37Q closed out in FFA under findings of fact p. 19. SWMUs 37A and 37X were closed out in February 2002 via closeout reports. SWMUs 37B, 37BB, 37J, 37T, and 37U were closed out in July 2002 via closeout reports. SWMU 37E groundwater was closed out in 2003 via closeout report. SWMU 37II was closed out in January 2005 and SWMU 37V was closed out in March 2005 via closeout reports.	Closeout of 37E (soil) via closeout reports. SWMUs 37E (groundwater) and 37N are part of ongoing investigations. SWMU 37W is scheduled to be removed during Building 8 demolition.

	SWMU 38	Parts Cleaners 1960s - 2002 Approximately 5-gallon capacity units used to degrease and clean tools and small metal parts.	SWMU 38 was closed out in February 2002 via closeout report.
	SWMU 39	Weir 1988 - present A concrete skimmer located along a part of the drainage ditch system (SWMU 27A). This unit was constructed as a contingency measure in the event of a fuel oil release from a boiler at Building 344.	The RFA recommended that soil samples be collected around and upstream of the unit. Because these weirs are part of the drainage ditch system on Plant 1, they are associated with SWMU 27A.	Based on the October 22, 1997 agency meeting, further action is planned for this SWMU under SWMU 27A. This area was investigated during the Phase III SWMU/AOC Investigation in 2002 and 2003. Results for this SWMU will be presented with the overall SWMU 27A findings.
	SWMU 40	Laboratory Exhaust Filter 1960s– 1998 Disposable filter mechanism located outside of the Strand Bomb Testing Laboratory. This unit managed combustion products from propellant testing.	SWMU 40 was removed June 1998. The SWMU was included in the Phase II SWMU/AOC Investigation. Screening of the confirmatory data suggested the remaining constituent concentrations do not exceed applicable regulatory screening criteria. Therefore SWMU 40 was closed out in July 2002 via closeout report.
	SWMU 41	Automotive Maintenance Area Drain 1940s – 1998 This unit managed washdown water and liquids from inside the building. Waste oil, coolants, and solvents are used regularly in this area.	SWMU 41 was closed out in February 2002 via closeout report
	SWMU 42	SWMU 42 is now listed as AOC F
	SWMU 43	Soil Pile 1992 Soil excavated from the area behind Building 7 in 1992 when seven USTs were removed was landfarmed on a plastic liner in an open area east of Building 7. The soil was reportedly contaminated with diesel and gasoline fuel components from the UST cleanup operations.	SWMU 43 was closed out in February 2002 via closeout report.
	SWMU 44	Settling Basin 1992 When the USTs and surrounding soil were removed from behind Building 7 the excavation pits filled with water. Air stripping was conducted on the water and then the water was pumped to a manmade basin 300 feet north of the former tank area. Solids were allowed to settle and water then discharged to the drainage ditch system (SWMU 27A).	The RFA recommended water samples be collected at this SWMU. Effluent water samples were collected and evaluated. The WVDEP branch overseeing the activities at this SWMU agreed that no further action was necessary. This SWMU was closed out under FFA findings of fact, p. 19.
	SWMU 45	Air Stripper 1992 An air stripper was temporarily installed in the excavation pits behind Bldg. 7 (see SWMU 43 and 44 description). The unit received water from the excavation area with a TPH content of less than 10 ppb.	SWMU 45 was closed out in February 2002 via closeout report.
	SWMU 46	SWMU 46 is now listed as AOC G
	SWMU 47	SWMU 47 is now listed as AOC H
	SWMU 48	SWMU 48 is now listed as AOC I
	SWMU 49	SWMU 49 is now listed as AOC J
	SWMU 50	SWMU 50 is now listed as AOC K
	SWMU 51	SWMU 51 is now listed as AOC L
	SWMU 52	Current Alodine Treatment Tank (no longer in use) 1991 - 1995 A treatment tank which was open on top with a plastic containment structure beneath it. This treatment tank operated at the same location as the former Alodine treatment tank (see SWMU 12 description). This SWMU is part of IR Site 12.	SWMU 52, part of AOC N, was part of the Phase I, Phase II, and Phase III SWMU/AOC investigations. Based upon the results of the Phase III, AOC N has been redesignated as IR Site 12.	No further action is planned for SWMU 52, but further investigation is ongoing for IR Site 12.
	SWMU 53	Former PCB Storage Area 1980s - 1990 Fully enclosed wooden shed with a concrete base. 55-gallon drums of PCB material and hydraulic equipment units, which contained PCB oil, were stored at this unit.	SWMU 53 was closed out in February 2002 via closeout report.
	SWMU 54	Building 7 UST Removal Site 1950s - 1992 Former location of seven USTs which held gasoline and diesel. These tanks were removed as part of the facility UST removal program in 1992. This SWMU is associated with SWMUs 43, 44, and 45.	SWMU 54 was closed out in February 2002 via closeout report.
	SWMU 55	Building 2 UST Removal Site 1946 - 1991 Former location of two 550-gallon USTs, which were used to store heating oil. These tanks were removed as part of the facility UST removal program in 1991. This unit was found to contain contaminated soil (TPH associated with the heating oil from the former tanks). The contaminated soil was removed and thermally treated to remove the petroleum contamination.	The RFA recommended that an RFI be conducted to assess the nature and extent of contamination. A data package including documentation of pre-removal sampling, the removal action taken, confirmatory sampling, and groundwater monitoring was provided to WVDEP and reviewed. The tanks were not regulated, so no formal reporting of the removal effort was required. The work was monitored by the WVDEP and verbal authorization was given to close the excavation. Confirmatory soil sample results were evaluated. Based on the data, the agencies agreed that no further actions were necessary for this SWMU. This SWMU was closed out under FFA findings of fact, p. 19.
	SWMU 56	Building 3 UST Removal Site 1966 - 1991 Former location of four USTs, which were used to store No. 5 fuel, oil. These tanks were removed as part of the facility UST removal program in 1991. This unit was found to contain contaminated soil from No. 5 fuel oil spill from the former tanks (TPH levels less than 50 ppm).	The RFA recommended that an RFI be conducted to assess the nature and extent of contamination. A data package including confirmatory sampling was provided to WVDEP and reviewed. The tanks were not regulated, so no formal reporting of the removal effort was required. The work was monitored by the WVDEP and verbal authorization was given to close the excavation providing that a groundwater monitoring well was installed in the excavation of Tank 3-1. The well was installed and sampled. The groundwater results were reviewed. Based on the data, the agencies agreed that no further actions were necessary for this SWMU. This SWMU was closed out under FFA findings of fact, p. 19.
	SWMU 57	Building 300 UST Removal Site 1964 - 1991 Former location of one 15,000-gallon UST which was used to store No. 5 fuel oil. This tank was removed as part of the facility UST removal program in 1991. This unit was found to contain soil with less than 100 ppm TPH.	The RFA recommended that an RFI be conducted to assess the nature and extent of contamination. A data package including confirmatory sampling was provided to WVDEP and reviewed. The tank was not regulated, so no formal reporting of the removal effort was required. The work was monitored by the WVDEP. The agencies agreed that no further actions were necessary for this SWMU. This SWMU was closed out under FFA findings of fact, p. 19.
	SWMU 58,	Building 2 PCB Spill Area Date unknown A PCB spill was reported from hydraulics associated with a large hydraulic press, which had once operated in the building.	SWMU 58 was closed out in February 2002 via closeout report.
	SWMU 59	Building 3 Drain Date unknow	SWMU 59 was closed out in February 2002 via closeout report.
	SWMU 60	Building 23 Pesticide Storage Area Date unknown Storage area used by a former maintenance supervisor to store tools. Two pesticide spray pump canisters were observed in the area. The extinguishers were filled with methylene chloride and used to remove wasps from work areas. Pesticides were never stored in this area.	SWMU 60 was closed out in February 2002 via closeout report.
	SWMU CCT	Condensate Catch Tank 1958 - 1963 SWMU CCT was the condensate collection sump for the steam lines associated with the former Large Motor Manufacturing Building that exploded in 1963.	SWMU CCT was removed in 2001 and was closed out in February 2002 via closeout report.
	AOC A	Underground Storage Tanks 1960s – 1980s This AOC comprises 14 USTs that were used to store primarily fuel oil. One 1,000-gallon tank adjacent to Bldg. 100 was used to store heptane during experiments conducted in 1972 and 1973. Several of the USTs have been removed and/or closed in place. Seven USTs remain in service; six of these tanks are regulated.	AOC A was closed out in February 2002 via closeout report.
	AOC B	PCB Transformers Storage Area Unknown -1992 The unit served as a staging area for transformers which were designated for reuse at the facility. The transformers contained PCBs. All transformers were removed from the area in 1991 and 1992.	AOC B (SWMU 10002) was closed out in September 2000 via closeout report.
	AOC C	Condensate Discharge Area Present during RFA site visit (1993) An earthen area, partially vegetated, which measures approximately 4 feet by 5 feet. A pipe extending from Building 105 discharges warm water with a high iron oxide content.	The RFA recommended that soil samples be collected from around the unit. The analytical data from these samples indicated that the condensate comes from steam generated in the boilers at Building 344. The agencies agreed that no further actions are required at this AOC because the condensate discharge will be regulated as Class 5 injection wells or under the NPDES for the facility. This AOC was closed out under FFA findings of fact, p. 20 under FFA findings of fact, p. 20.
	AOC D	Building 181 Pit Present during RFA site visit (1993) Round, vertical, below-grade terracotta pipe located near Building 181, which appeared to be a possible discharge outlet. There was no historical information regarding this unit, but it is believed to be part of the facility’s drainage system.	The RFA recommended that the integrity of the pit be tested, and if unsound, soil samples be collected around the pit. Documentation and visual inspection of the "pit" by the agencies determined that the "pit" was a manhole for a sewer line to a now-abandoned septic tank and no cracks or evidence of leaking was observed. Therefore, the agencies agreed that no further action was required for this AOC providing that the septic tank and drainage field be included as part of the facility septic tank investigation. This AOC was closed out under FFA findings of fact, p. 20.
	AOC E	Above Ground Storage Tanks Spills Area Present during RFA site visit (1993) These above-ground storage tanks are surrounded by concrete berm that extends 4 feet above ground and 3 feet below ground. During an EPA inspection, an oil spill was noted within the bermed area. During the RFA site visit, standing water, believed to be condensate discharge, was observed within the bermed area.	The RFA suggested that a sampling and monitoring program be implemented. ABL has already completed work (with EPA Region III concurrence) to remove contamination from the area. For this reason, the agencies have agreed that no further action is required for this AOC. This SWMU was closed out under FFA findings of fact, p. 20.
	AOC F / IR Site 9	Acid Neutralization Pit 1970s - 1992 (however, not used until 1988) Served as a contingency discharge area for sulfuric acid from a nearby storage tank. In August 1992, the facility replaced the sulfuric acid tank with a self-contained tank; during the replacement operation, a release of approximately 600 gallons of sulfuric acid occurred. The release was neutralized and reported to the National Response Center. The pit was backfilled in late 1992 and no contamination was found.	The RFA recommended that soil samples be collected from the pit area and between the pit area and the drainage ditch. Following the collection of samples and an inspection by the WVDEP, the agencies agreed that no further action was required for this AOC. This SWMU was closed out under FFA findings of fact, p. 20.
	AOC G	X Range Area 1944 - present This unit manages explosive residuals, which are generated as a result of the rocket motor and igniter testing procedures. Propellants may contain AP, aluminum, NG, nitrate esters, NC, RDX, and HMX as primary ingredients. Firing has lead to erosion of the hillside, and residues from fired materials may have reached the soil. Occasionally, rocket motors being tested explode; burning propellant and motor parts are discharged onto the hillside generating small fires.	The RFA recommended that soil samples be collected n the vicinity of test firing bays at Buildings 77, 193, 194, and 242.	The unit is still in operation.
	AOC H	Centrifuge Unknown – 1998 The centrifuge was used for test firing of rocket motors. The centrifuge was driven by hydraulic pumps that were in turn driven by a diesel motor. Periodically, a motor would explode, but the majority of the explosion was contained within the centrifuge. Following an explosion, remains that were dispersed outside the unit were collected for evaluation purposes and disposed of elsewhere. The centrifuge and motor house were demolished in December 1998.	AOC H was closed out in February 2002 via closeout report.
	AOC I / IR Site 6	Sensitivity Test Area and Pond 1970s - present Since 1989, .50-caliber bullet impact testing and flammability testing of rocket motors have been conducted in this area. This unit includes a pond, which serves as a catch basin for runoff from the sensitivity area. The unit manages explosive residuals transported by stormwater runoff from this area. Water from this pond would flow via tributaries to the North Branch Potomac River. RDX and other explosive constituents were detected in surface water samples.	A portion of AOC I (Site 6, the pond) was closed out in February 2002 via closeout report.	The sensitivity test area is still under investigation.
	AOC J	A and B Ranges 40s - 1970s This unit consists of two subscale rocket motor static test firing ranges. These ranges likely received propellant residue as a result of rocket motor test firing operations.	SWMU 49/AOC J (SWMU 10006) was closed out in September 2000 via closeout report.
	AOC K	C Range 1940s This unit was used for test firing of .50-caliber machine gun ammunition during World War II. Bullets were fired into a sand filled backstop (Building 43) during testing operations.	The material in the AOC has been removed and the AOC was closed out in September 1999 via closeout report.
	AOC L	H Range 1940s The unit is believed to have been used as a mortar testing range during World War II. The ballistics characteristics of mortar propellant were tested by firing the materials toward the hillside. This range potentially received propellant and explosive constituents during testing operations.	AOC L was closed out in September 1999 via closeout report.
	AOC M	Debris Landfills Dates unknown This AOC comprises three areas along the northern perimeter of Plant 1 where debris from demolished, exploded buildings and fired rocket hardware have been placed.	Soil sampling was conducted at AOC M in October 2001. The data are being evaluated concurrent with the Site 1 soil data to determine whether the AOC can be closed with no further action.
	AOC N	Building 167 SWMUs 1970s – present This AOC comprises five SWMUs (12, 14, 24S, 37N, and 52). See specific descriptions under each of these SWMUs.	AOC N was investigated during the Phase I, Phase II, and Phase III SWMU/AOC investigations. Based on the findings of the Phase III investigation, AOC N has been designated as IR Site 12, which is under investigation. Field investigations at Site 12 were initiated in 2003 as part of an RI to address data gaps identified following the Phase III Investigation.	It is expected that field investigation activities at Site 12 will be completed in 2004. Results of the field investigation and risk assessment findings will be presented in a forthcoming RI/FS Report.
	AOC O	Impact Area for Ranges F, G, and H mid-1940s AOC O is the hillside at the eastern end of Plant 1 to where mortars and other munitions were fired. The area is now completely vegetated and bears no readily observable evidence of mortar impact. According to historical information, no explosive warheads were used at F, G, and H Ranges. Several concrete-filled mortar shells were unearthed in 1991 during construction and found to be inert.	AOC O was closed out in July 2001 via closeout report.
	AOC P	Former ground Scar Area Unknown During the 1992 Aerial Photographic Site Analysis (APSA) EPA identified a probable burn area located about 500 feet northwest of Site 2 which has been identified as AOC P. Based on the results of the APSA, soil sampling was conducted in this area. AOC P was added to Appendix B of the FFA in April 2002.	AOC P was closed out in 2003 via closeout report.
	AOC Q	Former Solvent Storage Shed AOC Q has been identified as the former solvent storage shed area. AOC Q was added to Appendix B of the FFA in April 2002.	AOC Q soil was closed out in 2003 via closeout report.
	AOC R	Former Solvent Storage Shed Unknown AOC R has been identified as the former solvent storage shed area. AOC R was added to Appendix B of the FFA in April 2002.	AOC R was closed out in 2003 via closeout report.
	AOC S	Fenced Westernmost Sensitivity Test Area (formerly a portion of AOC I Late 1980s – 2002 AOC S, the sensitivity test area, is located on the hillside about 100 feet west of the Site 6 pond. The area was used for .50-caliber bullet impact testing and flammability testing of rocket motors.	The sensitivity test area is still under investigation.	The area is not currently bein g used and is anticipated to be closed by ATK.
	IR Site 1	Northern Riverside Waste Disposal Area Late 1950s – 1960s This IR site includes SWMUs 1, 7, 8, 11, & 20. See SWMUs 1, 6, 7, 8, 11, 20, and 22C and 22D descriptions.	See SWMUs 1, 6, 7, 8, 11, 20, and 22C and 22D.
	IR Site 2 / SWMU 4	See SWMU 4 description
	IR Site 3 / SWMU 5	See SWMU 5 description
	IR Sites 4A and 4B	See SWMUs 18 and 19 descriptions IR Site 4A is also SWMU 19. IR Site 4B is also SWMU 18.
	IR Site 5 / SWMU 9	See SWMU 9 description
	IR Site 6	This IR site is part of AOC I. See AOC I description.
	IR Site 7 / SWMU 10	See SWMU 10 description.
	IR Site 8	This IR site includes SWMU 37. See SWMU 37 description
	IR Site 9 / AOC F	See AOC F description.
	IR Site 10	Former TCE Still and Production Well A (PWA) 1959 – early 1960s A TCE groundwater plume has been detected near Building 157. The source is believed to be a former still which operated adjacent to Building 157.	Soil and groundwater at this SWMU have been investigated during the RI; Phase II RI; Phase I and II Aquifer Testing; and 2001 supplemental soil investigation. An interim ROD was signed for groundwater remediation in August 1998. Construction of a groundwater treatment plant was completed and has been operational since September 30, 1998. Groundwater extraction at Site 10 began in February 1999. The groundwater extraction system was modified in February 2003 based on results of the Phase III Aquifer Testing to include an additional alluvial extraction well and four bedrock extraction wells.	Human health and ecological risk assessments for Site 10 soil have been updated to include the supplemental data collected in 2001. A combined draft RI/FS for Sites 3, 4B, and 10 will be submitted in 2004.
	IR Site 11	Building 215 / Production Well F 1961 This site is the area surrounding and including a 8-inch-diameter water supply well that was never put into production because of sand accumulation. The well was uncovered during demolition of Building 215. Petroleum hydrocarbons and solvents have been found in the well.	The RI activities, including a year of quarterly sampling, have been completed. The anticipated source of contamination (i.e., DNAPL) has been removed from F-Well. A draft RI Report was submitted in November 2002.	A Pilot Study Work Plan and associated field activities are planned for 2004. Results of the pilot study will be included in a forthcoming FS.
	IR Site 12	Building 167 SWMUs 1978 – 1982 This site was formally known as AOC N, which comprises five SWMUs (12, 14, 24S, 37N, and 52). See specific descriptions under each of these SWMUs.	Field investigations were initiated in 2003 as part of an RI designed to address data gaps identified following the Phase III SWMU/AOC Investigation of AOC N. Ongoing RI activities at Site 12 include the installation and sampling of six alluvial and bedrock groundwater monitoring locations, downhole geophysical surveying, including flow logging, and limited packer testing, and dye tracer testing.	It is expected that field investigation activities at Site 12 will be completed in 2004. Results of the field investigation and risk assessment findings will be presented in a forthcoming RI /FS Report.

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Facility Wide Investigations

The following base-wide investigations were completed through the IRP.

Initial Assessment Study

The Initial Assessment Study (IAS) was performed at ABL in 1983 under the NACIP to identify and assess sites posing a potential threat to human health or the environment due to contamination from past hazardous materials handling and operations (NACIP, 1983). Nine potentially contaminated sites were identified at ABL, based upon information obtained from historical records, photographs, site inspections, and personnel interviews, during the IAS.

These nine sites are:

Site 1: Northern Riverside Waste Disposal Area (includes SWMUs 1, 6, 7, 8, 11, 20, 22C and 22D)
Site 2: Previous Burning Ground (1942-1949) (includes SWMU 4)
Site 3: Previous Burning Ground (1950-1958) (includes SWMU 5)
Site 4: Spent Photographic Developing Solutions Disposal Sites
Site 5: Inert (Non-Ordnance) Landfill (includes SWMU 5)
Site 6: Sensitivity Test Area/Surface Water Impoundment
Site 7: Beryllium Landfill (includes SWMU 10)
Site 8: Explosives Wastewater Sumps/Catch Basins
Site 9: Former Acid Disposal Pit

Each of the nine sites identified during the IAS was evaluated for the type of contamination, migration pathways, and pollution receptors. The IAS concluded that six of the nine sites (sites 1 through 6) posed significant potential threat to human health or the environment and warranted further evaluation in a confirmation study. Sampling and analysis was not performed as part of the IAS.

Three sites have been added to the IRP at ABL since the IAS. These are:

Site 10: Former TCE Still at Building 157 (includes Site PWA)
Site 11: Production Well "F" (uncovered and identified during building demolition activities in November 1994 and includes SWMU 36)
Site 12: Building 167 SWMUs, formerly AOC N (groundwater VOC plume discovered during Phase III SWMU/AOC Investigation)

Confirmation Study

A Confirmation Study (CS) was initiated in June 1984 and completed in August 1987. The purpose of the CS was to confirm or refute the existence of the suspected contamination at sites 1 through 7 identified during the IAS, along with Plant Production Wells in the developed portion of Plant 1 (specifically PWA and PWC, which are now part of Site 10); springs; and the North Branch Potomac River. The results of the CS, documented in the Interim Remedial Investigation (Interim RI) Report (Weston, 1989), were used to recommend further investigation at six sites (i.e., sites 1, 2, 3, 5, 7, and minimal activity at Site 4 [4A and 4B]) and Site PWA. The Interim RI Report also recommended that activities be discontinued at Site 6.

Remedial Investigation

A Remedial Investigation (RI), initiated in May 1992 and completed in October 1992, was conducted to further define the nature and extent of contamination at a number of ABL sites based upon the results and recommendations of the CS. The RI Report recommended further investigation at sites 1, 2, 3, 5 and PWA (CH2M HILL, January 1996). Because Site 1 was the largest and most complex site at ABL, with the highest concentrations and widest variety of constituents detected in soil, groundwater, surface water, and sediment samples, a separate focused Remedial Investigation/Feasibility Study (RI/FS) was recommended at the site to expedite the evaluation process. The remaining four sites were recommended for further investigation in a Phase II Remedial Investigation (Phase II RI).

Phase II Remedial Investigation

A Phase II RI was conducted in 1994 to further define the nature and extent of contamination at sites 2, 3, 4, 5, and PWA. During this investigation, baseline human health and ecological risk assessments were performed to evaluate the risk posed by each site. The results of the Phase II RI concluded that remedial action alternatives should be evaluated for TCE contaminated soil at Site 3 near Building 151, the solvent storage shed; contaminated soils at Site 4B; contaminated soil and groundwater at the former TCE still area at Site PWA; and the landfill contents and contaminated groundwater at Site 5.

Residential Well Sampling Report

In November and December 1994, a residential well sampling event was conducted to determine if constituents of concern detected at ABL had affected the groundwater potentially utilized by residents on the opposite side of the North Branch Potomac River from ABL. Groundwater samples were collected from eight wells at seven residences located along McKenzie Tower Road, directly across the river from Site 1. The Residential Well Sampling Report concluded that it was unlikely residential well water had been affected by groundwater contamination at ABL because VOCs (the primary constituents of concern in groundwater at ABL) were not detected in the residential well samples (CH2M HILL, March 1995).

Phase I Aquifer Testing and Phase II Aquifer Testing

To remain consistent with the designation of sites at ABL, Site PWA was renamed Site 10 in 1995. In order to evaluate the hydraulic properties of the alluvial and bedrock aquifers at sites 1 and 10 and to determine the optimal number, configuration, and withdrawal rates of extraction wells, Phase I Aquifer Testing and Phase II Aquifer Testing at Site 1 and Site 10 were conducted in 1995 and 1996, respectively (CH2M HILL, December 1998, September 1999a, and September 1999b).

Phase III Aquifer Testing

Phase III Aquifer Testing was conducted in 2001, in part to evaluate the hydraulic interconnection between Site 1 and Site 10 and the likelihood of being able to hydraulically contain the groundwater contaminant plume at Site 10 containing VOC concentrations above MCLs. Based on the results of the Phase III Aquifer Testing activities, it was determined that the addition of a fourth alluvial extraction well and four bedrock extraction wells to the existing Site 10 extraction well alignment would likely meet the containment objectives in both the alluvial and bedrock aquifers. These changes to the extraction system were proposed as the final remedial alternative for Site 10 groundwater in a November 2001 PRAP. Construction of the Site 10 groundwater extraction system modification and the installation of four additional monitoring wells (three bedrock and one alluvial) was completed and the modified system activated in February 2003.In order to evaluate the presence of potential constituents of concern at Site 6, sediment samples were collected in 2001. The data from these samples were evaluated and it was determined that site conditions are protective of human health and the environment. Because Site 6 was not recommended for further investigation in the FFA, the sampling results, risk evaluation, and site closure was documented in a no further action closeout document in February 2002.

Supplemental Investigation

While evaluating available data for human health and ecological risk assessment revisions for sites 1, 2, and 3, additional data gaps were identified. Therefore, a supplemental investigation was conducted for the surface and subsurface soil at the three sites in October 2001. A Remedial Investigation Report for site 1 soil is currently being prepared, this report will include a revised human health and ecological risk assessment. A supplemental groundwater investigation is also ongoing at Site 2 to evaluate the potential for additional source areas upgradient of the site. The soil and groundwater data from these investigations will be used to revise the human health and ecological risk assessments for sites 2 and 3 and an RI/FS will be produced following revision of the risk assessments.

Phase III SWMU/AOC Investigation

During Phase III SWMU/AOC Investigation activities at AOC N, VOC contamination was discovered in the alluvial aquifer in the vicinity of Building 167 and below and adjacent to the former SWMU 37N wastewater sump. Because of the relatively large area and high levels of contamination, AOC N was designated IR Site 12. Field investigations at Site 12 are ongoing. Field investigation results and risk assessment findings will be presented in a RI/FS.

Background Study

A background study was performed in 2003 to establish background concentrations for soil inorganics at ABL. These background concentrations are being utilized in ongoing human health and ecological risk assessments and in developing soil PRGs for several sites at the facility.

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SWMU Investigations

In 1993, the USEPA conducted a Preliminary Review (PR) at ABL which involved a review of all relevant USEPA Region III files, including RCRA, CERCLA, Toxic Substance Control Act (TSCA), air, and water files. Additionally, a Visual Site Inspection (VSI) was conducted at the facility from February 2 through February 4, 1993. The results of the PR and VSI were documented in the Phase II RCRA Facility Assessment for Allegany Ballistics Laboratory (RFA) (USEPA, August 1993). This study served as a facility-wide inventory of SWMUs and other AOCs at the facility. Based upon the results of the RFA, it was recommended that further action be taken at 49 SWMUs and 12 AOCs. After performing a site visit to the SWMUs and AOCs identified during the RFA, the USEPA, Region III and WVDEP identified an additional 31 SWMUs and AOCs for a total of 92 units, where further action was recommended.

The primary purpose of ABL Partnering Team meetings held on February 21 through 23, March 27 and 28, and May 3 and 4, 1995 was for representatives from the USEPA Region III, WVDEP, Maryland Department of the Environment (MDE), the Navy, ATK, and CH2M HILL to review all available information for the 92 SWMUs and AOCs, develop appendices A and B of the FFA, and agree upon the final list of SWMUs and AOCs requiring further action.

As part of 1997 and 1998 FFA negotiations, the USEPA, WVDEP, and Navy determined that no further action was warranted under CERCLA for 11 SWMUs and AOCs (i.e., SWMUs 19, 37Q, 44, 54, 55, 56, 57, and AOCs C, D, E and F). In addition, 10 SWMUs (i.e., SWMUs 1, 4, 5, 7 through 11, 18, and 20) were determined to be within the boundaries of existing IR sites and would be addressed under the ongoing RI/FS process. SWMU 39, the weir, was incorporated with the Facility Drainage Ditch System (SWMU 27), which was renamed SWMU 27A. SWMU 41, the Automotive Maintenance Drain, was incorporated with SWMU 37B, Building 7 Sump, for investigation and further evaluation.

In October 1995, in preparation for conducting a SWMU/AOC investigation at the units recommended for further action or evaluation, a site visit was conducted by representatives of the USEPA Region III, WVDEP, MDE, Navy, ATK, and CH2M HILL to select mutually agreeable sampling locations most likely to have been affected by past activities at each SWMU/AOC and to provide a risk ranking of the SWMUs/AOCs. The units selected for investigation during the 1996 SWMU/AOC Investigation were:

SWMU 21-Building 241 Catch Basin
SWMU 22A-Explosive Waste Incinerator
SWMU 22B-Classified Document Incinerator
SWMU 22C-Pilot Fluidized Bed Incinerator
SWMU 22D-Non-Explosive Combustible Incinerator
SWMU 23-Salvage Yard
SWMU 24E-Building 7 Satellite Accumulation Area
SWMU 24J-Building 16 Satellite Accumulation Area
SWMU 24V-Building 153 Satellite Accumulation Area
SWMU 26-Septic Tank
SWMU 27A-Drainage Ditch System
SWMU 37A-Building 4 Wastewater Sump
SWMU 37B-Building 7 Wastewater Sump
SWMU 37C-Building 12 Wastewater Sump
SWMU 37D-Building 13 Wastewater Sump
SWMU 37E-Building 15 Wastewater Sump
SWMU 37F-Building 22 Wastewater Sump
SWMU 37G-Building 27 Wastewater Sump
SWMU 37H-Building 32 Wastewater Sump
SWMU 37I-Building 49 Wastewater Sump
SWMU 37J-Building 100 Wastewater Sump
SWMU 37K-Building 103 Wastewater Sump
SWMU 37L-Building 105 Wastewater Sump
SWMU 37M-Building 105A Wastewater Sump
SWMU 37N-Building 167 Wastewater Sump
SWMU 37O-Building 226 Wastewater Sump
SWMU 37P-Building 248 Wastewater Sump
SWMU 37S-Building 280 Wastewater Sump
SWMU 37T-Building 11 Wastewater Sump
SWMU 37U-Building 22 Wastewater Sump
SWMU 40-Laboratory Exhaust Filter
SWMU 52-Alodine Treatment Tank
SWMU 58-PCB Spill Area
AOC B (SWMU 10002)-Transformer Storage Area
AOC J (SWMU 10006)-A and B Ranges
AOC K (SWMU 10007)-C Range
AOC L (SWMU 10008)-H Range

All but six SWMUs listed in the appendices of the FFA were included in the 1996 SWMU/AOC Investigation. The six units included in the FFA but not investigated are:

SWMU 24W-Satellite Accumulation Area Building 257
SWMU 34A-Building 252 Oil/Water Separator
SWMU 34B-Building 341 Oil/Water Separator
SWMU 36-Oil Pit (included in IR Site 11)
SWMU 37V-Building 14 Wastewater Sump
SWMU 37W-Building 8 Wastewater Sump

The results of the SWMU/AOC Investigation were used to identify particular SWMUs/AOCs for further investigation, no further action, or removal action. The analytical results of the SWMU/AOC Investigation are documented in the Report of Findings, Investigation of Solid Waste Management Units and Areas of Concern at Allegany Ballistics Laboratory (CH2M HILL, March 1996). Recommendations for or against further action at the 37 SWMUs/AOCs were presented in the Final Phase I SWMU/AOC Investigation at Allegany Ballistics Laboratory (CH2M HILL, October 2001). The Final Phase I SWMU/AOC Investigation Report identified constituent levels in soil and/or groundwater at six SWMUs (i.e., SWMUs 27A, 37C, 37J, 37N, 40, and 52) that suggested the need for further evaluation to determine the extent of contamination. No further action was recommended at 31 of the 37 SWMUs/AOCs based upon the direct-push soil and groundwater analytical results.

In November 1998, based upon review of existing SWMU/AOC data, the USEPA, WVDEP, and Navy mutually agreed upon a list of 21 SWMUs/AOCs requiring further investigation or removal, including four of the six recommended for further evaluation during the Final Phase I SWMU/AOC Investigation Report (i.e., SWMUs 37C, 37J, 37N, and 52). Of the 21 SWMUs/AOCs, three (i.e., SWMU 24E, 34A/B, and 37B) were determined to require only removal and confirmatory soil sampling. The USEPA, WVDEP, and Navy visited each of the remaining 18 SWMUs/AOCs proposed for investigation to identify individual sampling locations. Each of the sampling locations was photo-documented and surveyed for horizontal control using global positioning system (GPS) technology.

Based upon the site visit, review of additional site data, and further discussion by the USEPA, WVDEP, and the Navy, four of the 18 SWMUs (i.e., SWMUs 37D, 37P, and 37S, and AOC L) were determined not to require additional investigation and were removed from the Final Project Plans for the Phase II Investigation of Solid Waste Management Units and Areas of Concern at the Allegany Ballistics Laboratory Superfund Site (CH2M HILL, June 2000). At the same time, the USEPA, WVDEP, and Navy determined that five units (i.e., SWMUs 34A, 34B, 37B/BB, 37X and 40) required further investigation in addition to proposed removal action activities and these units were added to the aforementioned final project plans.

Therefore, the following SWMUs and AOCs were investigated during a Phase II SWMU/AOC Investigation in 2000:

SWMU 21 - Building 241 Catch Basin
SWMU 24R - Building 219 Satellite Accumulation Area
SWMU 34A - Air Compressor Building 252 Oil Water Separator
SWMU 34B - Air Compressor Building 341 Oil Water Separator
SWMU 37B - Building 7 Wastewater Sump
SWMU 37BB - Building 7 Grease Trap Sump
SWMU 37C - Building 12 Wastewater Sump (groundwater only)
SWMU 37E - Building 15 Wastewater Sump
SWMU 37F - Building 22 Wastewater Sump
SWMU 37G - Building 27 Wastewater Sump
SWMU 37J - Building 100 Wastewater Sump
SWMU 37T - Building 11 Wastewater Sump
SWMU 37U - Building 22 Wastewater Sump
SWMU 37V - Building 14 Wastewater Sump
SWMU 37W - Building 8 Wastewater Sump
SWMU 37X - Building 214 Wastewater Sump
SWMU 40 - Laboratory Exhaust Filter
SWMU 58 - Building 2, PCB Spill Area
AOC N - Building 167 SWMUs (SWMUs 25B, 37N, and 52)
AOC O - F, G, and H Range Impact Area

Phase II SWMU/AOC field investigation activities were performed in July 2000. Removal action activities were also conducted at several SWMUs in 2000. These units are:

SWMU 24E - Building 7 Satellite Accumulation Area
SWMU 24R - Building 153 Satellite Accumulation Area
SWMU 26 - Septic Tank
SWMU 37A - Building 4 Wastewater Sump
SWMU 37B - Building 7 Wastewater Sump
SWMU 37BB - Building 7 Grease Trap Sump
SWMU 37N - Building 167 Wastewater Sump
SWMU 37V - Building 14 Wastewater Sump
SWMU 37W - Building 8 Wastewater Sump
SWMU 37X - Building 214 Wastewater Sump

A Phase III SWMU/AOC Investigation is currently underway to determine the nature and extent of contamination at SWMUs 27A, 37V, 37E, and AOC N (Building 167 SWMUs, including SWMUs 37N and 52). As described above, AOC N is now identified as IRP Site 12 and is part of an ongoing Remedial Investigation. The results of the Phase III SWMU/AOC Investigation will be used to identify particular SWMU/AOCs for further investigation, no further action, or remedial action, as appropriate. Initial results of Phase III SWMU/AOC field investigations conducted in the Spring and Summer of 2002 indicated that additional investigations would be necessary to further characterize potential releases at each of the SWMUs. Investigations of each of these SWMUs is ongoing.

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Site Closeout Activities

The USEPA, WVDEP and Navy determined that no further action was required under CERCLA at six SWMUs; closeout documentation was prepared for the following six units in 1999:

SWMU 37H - Building 32 Wastewater Sump
SWMU 37K - Building 103 Wastewater Sump
SWMU 37M - Building 105A Wastewater Sump
SWMU 37O - Building 226 Wastewater Sump
SWMU 50 - C Range
SWMU 51 - H Range

In 2000, the USEPA, WVDEP, and the Navy continued evaluation of available SWMU/AOC data and determined that no further action was required under CERCLA at 13 SWMUs and 1 AOC. Therefore, SWMU/AOC closeout documentation was prepared and the following units were closed-out in 2000:

SWMU 22A - Explosive Wastewater Incinerator
SWMU 22B - Classified Document Incinerator
SWMU 22C - Pilot Fluidized Bed Incinerator
SWMU 22D - Non-Explosive Combustible Incinerator
SWMU 23 - Salvage Yard
SWMU 24J - Building 16 Satellite Accumulation Area
SWMU 24V - Building 153 Satellite Accumulation Area
SWMU 37C - Building 12 Wastewater Sump (soil only)
SWMU 37D - Building 13 Wastewater Sump (soil only)
SWMU 37I - Building 49 Wastewater Sump
SWMU 37L - Building 105 Wastewater Sump
SWMU 37P - Building 248 Wastewater Sump
SWMU 49 (10006) (a.k.a. AOC J) - A and B Ranges
AOC B (SWMU 10002) - PCB Transformer Storage Area

Following additional data collection at various SWMUs and AOCs, the USEPA, WVDEP, and the Navy evaluated the additional data and determined that no further action was required under CERCLA at five SWMUs and one AOC. Therefore, SWMU/AOC closeout documentation was prepared and the following units were closed-out in 2001:

SWMU 21 - Building 241 Catch Basin
SWMU 37C - Building 12 Wastewater Sump (groundwater only)
SWMU 37F - Building 22 Wastewater Sump
SWMU 37G - Building 27 Wastewater Sump
SWMU 37S – Building 280 Wastewater Sump
AOC O (SWMU 10008) – F, G, and H Range Impact Area

In 2002, the USEPA, WVDEP, and the Navy evaluated the additional data collected during the Phase II SWMU/AOC investigation and SWMU removals and determined that no further action was required under CERCLA for fourteen SWMUs and two AOCs. Therefore, SWMU/AOC closeout documentation was prepared and the following units were closed-out in 2002:

SWMU 24E - Building 7 Satellite Accumulation Area
SWMU 24W – Building 257 Satellite Accumulation Area
SWMU 26 – Septic Tank
SWMU 37A - Building 4 Wastewater Sump
SWMU 37B – Building 7 Wastewater Sump
SWMU 37BB – Building 7 Grease Trap
SWMU 37J – Building 100 Wastewater Sump
SWMU 37T – Building 11 Wastewater Sump
SWMU 37U – Building 22 Wastewater Sump
SWMU 37X - Building 214 Wastewater Sump
SWMU 40 – Laboratory Exhaust Filter
SWMU 58 – PCB Spill Area
SWMU 24R – Building 219 Satellite Accumulation Area
SWMU CCT – Condensate Catch Tank
AOC H – Centrifuge
Site 6 (portion of AOC I) – Sensitivity Test Area Surface Water Impoundment

In addition, a cumulative SWMU closeout document was prepared to document the rationale of no further action under CERCLA for SWMUs 24, 25, 28, 29, 30, 31, 32, 33, 35, 38, 41, 43, 45, 53, 54, 59, 60, and AOC A. This was done to formally document closure of those SWMUs/AOCs that had been identified at ABL, but were not part of the FFA nor were identified for further action by the EPA, WVDEP, and Navy.

In December 2004, a closeout document was signed for SWMU 2 - Former Hazardous Waste Storage Area II.

The USEPA, WVDEP and Navy determined that no further action was required under CERCLA at six SWMUs; closeout documentation was prepared for the following six units in 1999:

SWMU 37D - Building 13 Wastewater Sump (groundwater only)
AOC P - Former ground Scar Area
AOC Q - Former Solvent Storage Shed (soil only)
AOC R - Former Solvent Storage Shed

SWMU 37II was closed out in January 2005 and SWMU 37V was closed out in March 2005 via closeout reports.

A closeout document will be prepared at SWMU 37W following building demolition activities.

Based upon historical activities and analytical data, the following three AOCs were added to Appendix B of the FFA in 2002: AOC P: Former Ground Scar Area (located north of Building 294), AOC Q: Former Solvent Storage Shed (near Building 805), and AOC R: Former Solvent Storage Shed (near Building 151). Based upon historical activities and analytical data, AOC S (fenced westernmost sensitivity test area) was added to Appendix B of the FFA in 2003.

The 2002 Site Management Plan erroneously identified AOC I as being completely closed, whereas AOC I is only partially closed. Installation Restoration (IR) Site 6, the pond, was closed in February 2002, however the sensitivity test area was not closed and is still under investigation.

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Facility Wide Investigations

Site Closeout Activity