19-R-0074_PWS_Laughin_Dyess_Goodfellow_RA-O-LTM_Rev_5_19_July_2019.docx

Attachment 1

FA8903-19-R-0074

1 May 201919 July 2019

PERFORMANCE WORK STATEMENT

TO

CONDUCT REMEDIAL ACTION OPERATIONS (RA-O) AND LONG-TERM MANAGEMENT (LTM) FOR LAUGHLIN, DYESS, AND GOODFELLOW AFB’S, AND SHEPPARD, TEXAS

Project Numbers:

Laughlin: MXDP20197006; MXDP20197040; MXDP20197600; DLA Project # P.2019.00830 for Site SS014D Dyess: FNWZ20197800 Goodfellow: JCGU20197800 Sheppard: VNVP20197006

Solicitation: FA8903-19-R-0074

1 May 201919 July 2019

Performance Work Statement to Conduct Remedial Action Operations (RA-O) and Long-Term Management (LTM) for Laughlin, Dyess, and Goodfellow AFBs, and Sheppard, Texas

PART A - GENERAL REQUIREMENTS

In carrying out work assignment(s) issued under this contract, the Contractor shall furnish the personnel, services, equipment, tools, materials, vehicles, facilities supervision and other requirements necessary for, or incidental to, the performance of work set forth herein; assure any and all program and/or project related costing information (regardless of its stage in development) is secured, as directed by the Contracting Officer (CO); and be responsible for safeguarding proprietary, and other sensitive information. The Contractor shall be immediately capable of addressing and interpreting all aspects of environmental law and regulation.

Scope Introduction This Performance Work Statement (PWS) encompasses the full range of methods, technologies, and supporting activities necessary to conduct environmental restoration/remediation efforts in order to support remedial action operations (RA-O) and/or long-term management (LTM) for sites at Laughlin AFB, Dyess AFB, and Goodfellow AFB, and Sheppard AFB. Activities include installation of groundwater monitoring wells at Site FT005 and conducting semi-annual groundwater monitoring (RA-O) at Sites CG022, SS014, and TA500 at Laughlin AFB. Land Use Controls (LUCs/LTM) will be conducted at multiple sites at Dyess AFB, and Goodfellow AFB, and Sheppard AFB. Further details for required tasks are included in Section 6.10.5.

Support shall be conducted in accordance with all technical and regulatory requirements and a limited range of construction and ancillary services as required in support of those and other efforts as addressed herein. Requirements under this contract will primarily support environmental restoration/remediation, operations and services efforts; but requirements may also include traditional minor construction, demolition, and repair. Stand-alone design and conceptual work plan/implementation work plan (CWP/IWP) are NOT included in the scope of this contract.

Site Description and History:

A brief site description and history are provided for each site for each installation below. Additional information is available in site-specific documents on the Air Force Administrative Record at http://afcec.publicadmin-record.us.af.mil/Search.aspx.

Laughlin AFB – FT005, CG022, SS014 (Subdivided into parts A, B and D), and TA500 FT005 (Firefighter Training Area): This site comprises approximately 7.4 acres with two unlined pits that were used to conduct fire training exercises; first one from 1952 to 1974 and second one from 1974 to 1983. In 1983, the pit was remodeled and brought up to current standards. Materials used at the site include AVGAS, MOGAS, JP-4, JP-TS, engine oil, transformer oil, solvents, and extinguishing agents. Arsenic, benzene and total petroleum hydrocarbons (TPH) are the contaminants of concern (COCs). Light non-aqueous phase liquid (LNAPL) is present at the site. FT005 is currently in the RA-O phase with no estimated date for reaching remedy complete (RC); therefore, the RA-O phase and LTM phase both have rolling cost-to-complete (CTC).

CG022 (Area of Concern (AOC) 20): This site is located in the northern part of Laughlin AFB, near the Main Gate, north of Kansas Avenue, about 300 feet (ft.) north of its intersection with Alabama Avenue. CG022 (AOC 20) refers to the area around groundwater monitoring well SS014MW002, which is located approximately 400 ft. northeast of closed Installation Restoration Program (IRP) Site SS020, the Former Jet Engine Test Cell Facility. The duration of the groundwater monitoring program began with the acceptance of the CP modification renewal in April 2017. It is assumed that after the three-year monitoring period, concentration levels will be below PCLs, thus making the site eligible for closure.

SS014 (Fuel Receiving and Storage Area), Sub Areas A, B & D: This site is regulated under TCEQ SWR No. 69007; TCEQ Hazardous Waste Permit No. HW-50258; EPA ID No. TX2571524140; Regulated Entity No. RN102686086. This site is located in the north central portion of the Base, adjacent to the northwest portion of the flightline area. Historically, this site was used for the storage and transportation of jet fuel. The facility consists of four areas: (A) the bulk storage area that consists of ASTs and associated piping west of Liberty Drive; (B) the underground distribution lines that transferred fuel from the ASTs to the remote pumping station; (C) the fuel dispensing rack east of Liberty Drive and (D) a separate fuel release from a pipe leak at Tank A-1 in 2006. SS014 is subdivided into Subareas A, B, C, and D with the Air Force responsible for A and B while Area C is closed and Defense Logistics Agency (DLA) is responsible for a 2006 spill area that is designated Subarea D. Subarea C received closure and is therefore not covered under this task order. Since SS014 is considered one site by the regulators, the overall timeframe for RA-O would be 30 years based on the subareas A and B timeframe, beginning in 2010 and ending in 2040. A Compliance Plan modification to incorporate SS014 into the Laughlin CP was submitted in 2015 and was approved by the TCEQ in August 2016. A Remedial Action Evaluation Report (RAER) was approved by TCEQ on 18 October 2017.

TA500 (AS001); Marina: This site is located in the Diablo East Unit of the Lake Amistad National Recreational Area approximately 16 miles northwest of Laughlin AFB. The land is leased by the Air Force from the National Park Service. Facilities at the site include a boat ramp, parking areas for vehicles and boat trailers, cabins, office building, floating docks, a gasoline fueling system for watercraft and various other storage buildings. Groundwater and surface water are monitored for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons (TPH), no detections have been noted in surface water. TA500 is currently in the RA-O phase with no estimated date for reaching RC; therefore, the RA-O phase and LTM phase both have rolling CTC.

Dyess AFB – DP043, FT001, FT002, LF004, LF013, OT011, OT031, OT035, SD007, SD020, SD025, SD028, SD029, SS042, ST032, and WP005 LF004 (SWMU 7) (Landfill No. 4) / DP043 (SWMU 39) (POL Sludge Disposal Area No. 2): The Landfill, also known as SWMU 7, is located at the southern edge of the Base, southwest of Hardfill No. 1 in a seldom-used area of the Base. Nearby operations to the landfill are an adjacent grenade range and former FPTA No. 2. The site is approximately 1,800 x 1,800 feet. Native grasses and low brush cover the site. The landfill was used to dispose of all solid waste at the base from 1955 to 1972. The waste placed in the landfill was primarily refuse and garbage, but some shop wastes, construction debris, and vegetation were also included. The waste was disposed of in trenches approximately 260–300 x 16 x 8–10 feet. Once filled with waste, the trenches were covered with 4 to 5 feet of soil.

The POL Sludge Disposal Area 2, also known as SWMU 39, is located in the southern portion of the base next to the landfill and south of the Hardfill No. 1. The area was active between 1967 and 1978 and was used to dispose of unknown quantities of paint sludge, fuel tank cleaning wastes, and shop wastes by spreading them on the ground surface. The extent of this site is approximately 100 x 200 feet. LF004 and DP043 were evaluated as one unit for investigation and closure purposes.

Evaluation of site COCs under the Texas Natural Resource Conservation Commission (TNRCC) Risk Reduction Rule (RRR) guidelines indicated residual constituent concentrations present at LF004/DP043 present no significant risk to human health and the environment under the assumptions of commercial/industrial land use. The sites were closed with LUCs prohibiting residential land use and prohibiting potable groundwater use. After three years of semi-annual monitoring in 2000, 2001, and 2002 without exceeding the groundwater protections standards groundwater monitoring was discontinued. TCEQ approved Part A/Part B Permit Compliance Plan and Renewal on 2 April 2003, which included approved closure of LF004/DP043.

FT001 (SWMU3A) (Fire Protection Training Area No. 1A): FPTA No. 1A, also known as SWMU 3A, occupies an area measuring approximately 400 x 800 feet and is located west of the main runway and east of the assault landing strip. No surface evidence of past activities is visible at the Site. The site was used from 1956 to 1967 for fire training activities and is now hard packed and covered by native grasses. Drums of waste from flight line shops and vehicle maintenance shops were reportedly taken to the area, punctured, and ignited. These wastes include JP-4, oils, solvents, paint thinners, and paints. About 500 gallons of fuel were used per fire training exercise, and the average frequency of fires was four per month. Extinguishing agents included protein foam and water.

Evaluation of site COCs under the TNRCC RRR guidelines indicated that residual constituent concentrations at FT001 presented no risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use and prohibiting potable groundwater use. After three years of semi-annual monitoring in 2000, 2001, and 2002 without exceeding the groundwater protections standards, groundwater monitoring was discontinued. TCEQ approved Part A/Part B Permit Compliance Plan and Renewal on 2 April 2003, which included approved closure of FT001.

FT002 (SWMU3B) (Fire Protection Training Area No. 1B): FPTA No. 1B, also known as SWMU 3B, is located in the Marrion drop zone, west of the main runway, west of the asphalt landing strip, and north of FT001. The site was part of the Tye Airfield and is approximately 100 by 100 feet of flat terrain. The site was used from 1956 to 1967 for fire training activities and is now hard packed, covered by native grasses, and undetected by surface evidence. Drums of waste from flight line shops and vehicle maintenance shops were reportedly taken to the area, punctured, and ignited. These wastes include JP-4, oils, paint thinners, and paints. About 500 gallons of fuel was used per fire training exercise. The frequency for the fires is unknown, but expected to be about four per month. Extinguishing agents included protein foam and water.

The geologic investigation at FT002 showed that water-bearing materials were not present at this site; therefore, no groundwater evaluation was conducted. Evaluation of site COCs under TNRCC RRR guidelines indicated residual constituent concentrations at FT002 presented no risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use.

WP005 (SWMU 6)- Evaporation Pit Waste Storage Tank / LF013 (SWMU 9) Hardfill: The Evaporation Pit Area (WP005), also known as SWMU 6, is located in the northwestern portion of Hardfill No. 1. Two or more pits (including a main pit) may have been here. The actual size of the main pit is undetermined, although aerial photos indicate that in 1970, the pit did not exceed 200 feet on the longest side. The depth was reportedly 8 to 10 feet below the ground surface (bgs). The pit area was used for disposal of waste oil, solvents, jet fuel, and hydraulic fluid from the early 1950s to the late 1970s. Surface features of this site consist of a subtle depression sloping to the north, encompassing an area approximately 350 x 600 feet. Within the depression, a variety of partially buried debris was exposed. The debris consists of blocks of concrete and pavement, flattened drums, and other miscellaneous hardfill.

The Hardfill No. 1 (LF013), also known as SWMU 9, is located adjacent to the northwestern corner of the grenade range in the southern portion of the Base. The exact boundaries and aerial extent of LF013 were not well defined, but it was believed to occupy between 5 and 10 acres and was in use from 1955 to 1978. The area is no longer utilized and has become largely overgrown with grass and scrub.

WP005 is located within the boundaries of LF013. The area was used for the burial of various types of refuse and debris in unlined pits in the ground. The wastes included construction debris, tree limbs, asphalt, concrete, and empty pesticide and herbicide bags/containers. Base personnel stated that virtually anything could have been previously disposed of at LF013. WP005 and LF013 were evaluated as one unit for investigation and closure purposes.

Evaluation of site COCs under TNRCC RRR guidelines indicated residual constituent concentrations present at WP005/LF013 present no risk to human health and the environment under the assumptions of commercial/industrial land use. The sites were closed with LUCs prohibiting residential land use and prohibiting potable groundwater use. After three years of semi-annual monitoring in 2000, 2001, and 2002 without exceeding the groundwater protections standards, groundwater monitoring was discontinued. TCEQ approved Part A/Part B Permit Compliance Plan and Renewal on 2 April 2003, which included approved closure of WP005/LF013.

OT011 (SWMU 1) (DRMO-Building 9104 Waste Storage Area): The DRMO facility, also known as SWMU 1, is located on the northern side of Building 9104. The area includes several buildings and a fenced outdoor storage area that consists of bare ground and pavement of asphalt or concrete. Three areas of concern (North Source Area, West Source Area, and East Source Area) were identified in the RFI.

The North Source Area was located north of the fenced DRMO compound between the fence and a railroad spur. The ground surface in the area is flat and is covered with gravel. The area was used for drum storage from prior to 1980 until 1987.

The West Source Area was located within the fenced DRMO compound. The ground surface in the area is flat and is covered with concrete and asphalt. The area was used for drum storage from 1987 to 1988. TNRCC records indicate that approximately 40 drums, some of which were leaking, were stored in this area in 1988. The drums were removed for disposal in 1988 after chemical analysis of the contents. Chemical analysis indicated that drummed waste material included 1,2-dichloro-1,2,2-trifluoroethane, ethanol, 1,1,1-trichloroethane, petroleum hydrocarbons, low flash point materials, low pH materials, high pH materials, barium-containing wastes, lead-containing wastes, and chromium-containing wastes.

The East Storage Area was located within the fenced DRMO compound. The ground surface in the area is flat and is covered with concrete. A drainage swale located on the east side of the area collects surface water runoff from the paved lot around the East Source Area. The area consisted of container storage areas and waste pile areas. Drums stored within the area were reportedly leaking, and some drums were stored for five to seven years. No information is available regarding the dates, number, or types and quantities of materials spilled.

Evaluation of site COCs under TNRCC RRR program guidelines indicated residual constituent concentrations at OT011 presented no risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use and prohibiting potable groundwater use.

OT031 (SWMU19) (463 FMS/Refurbishment Shop-Building 5017): Site OT031 is located east of the aircraft parking apron south of the former Building 5017. Building 5017 was previously used for aircraft refurbishment operations. Hazardous wastes generated from operations were temporarily stored in the outdoor area from 1984 to 1990. The site consisted of two potential source areas: an approximately 72-square-foot concrete pad with a 6-inch concrete curb and a metal drum rack with no secondary containment. The concrete curb had a drain pipe and valve used for runoff control.

The areas received approximately 660 gallons of waste fluids per year. Waste fluids included dope thinner, lacquer thinner, enamel thinner, polyurethane thinner, polyurethane pain, lacquer, toluene, enamel paint, epoxy primer, methyl ethyl ketone, and solvent-containing rags. Wastes were transferred to the DRMO for storage prior to off-site disposal.

Site OT031 was recommended for closure under TNRCC RRS 1 for groundwater and RRS 3 for soils as a result of the 1998 CMI. The TNRCC concurred with the recommendations for site closure and removed Site OT031 from the Compliance Plan, which was approved 6 January 2000. A deed certification was filed in the Deed of Records of Taylor County 11 July 2000.

OT035 (SWMU32) (Golf Course Maintenance Shop): Site OT035 is located on the eastern portion of the base within the Golf Course area. The site formerly consisted of a fenced enclosure and contained the following buildings: 11973, 11974, 11975, 11977, and 11978. Building 11973 was used for golf cart, battery, and parts storage. Building 11974 and 11975 consisted of office space and a break room. Building 11977 was used for storage of turf chemicals and maintenance equipment. The floor of the building was concrete in the area where maintenance equipment was stored. The portion of the floor where fertilizers and other lawn treatment chemical were stored consisted of wooden planks directly on the ground surface.

Products stored at the site included golf course maintenance and utility vehicle maintenance items, including lead-acid batteries, turf maintenance equipment, fertilizers, pesticides, herbicides, oils, and other lubricants. Waste generated in the area included pesticide bags, used engine oil, and batteries. A wash area was also utilized for cleaning turf maintenance equipment.

The selected corrective measure for Site OT035 consisted of deed recordation of the site with soil and groundwater LUCs. A deed recordation was filed in the Deed of Records of Taylor County 11 July 2000. The TNRCC concurred with the recommendations for site closure and excluded Site OT035 from the Compliance Plan, which was approved 6 January 2000.

ST032 (SWMU29) (Auto Hobby Shop Waste Oil Tank): Site ST032 is located at the southeastern corner of Third Street and Avenue B. The site consisted of a UST previously associated with Building 7101 Auto Hobby Shop. The 500-gallon capacity UST was located at the southeast corner of the pavement outside Building 7101 and received approximately 1,200 gallons of waste oil per year. While in use, personnel would manually pour waste oil into the tank fill pipe, which was equipped with a funnel. Based on previous reports, soil staining was reported in the vicinity of the tank. Contents were removed from the UST for off-site disposal. The UST was removed in 1992. At that time, stained soil in the vicinity of the UST was excavated.

The selected corrective measure for Site ST032 consists of deed recordation of the site with soil and groundwater LUCs. A deed recordation was filed in the Deed of Records of Taylor County 11 July 2000. The TNRCC concurred with the recommendations for site closure and excluded Site ST032 from the Compliance Plan, which was approved 6 January 2000.

SD007 (SWMU34) (South Diversion Ditch (SDD)): The SDD, runs northeast across the Base from south of the main runway to east of the golf course, where the SDD exits the base. SWMU 34 is the entire stretch of the SDD that runs through the Base. Construction of the SDD was completed in 1958 to contain the flow of Little Elm Creek and conduct it across the Base. The ditch is approximately 150 feet wide at the top, narrowing to about 35 feet wide at the water level. Groundwater discharges into the ditch through seeps along the banks. Stretches of bedrock are exposed along the bottom of the ditch, and alluvial gravel can be seen in the ditch banks. The SDD is bermed above the surrounding land surface along much of its length, and the banks are covered with abundant vegetation.

Before the winter of 1987–1988, several oil/water separators at flight maintenance shops were connected to storm drains that eventually discharged into the SDD. Since then, operations have changed, and most oil/water separators discharge into sanitary sewers. Results from previous investigation activities indicated that concentrations of lead in the sediment exceeded TNRCC MSCs. TPH was also detected in the sediment; however, comparison values were unavailable during previous investigations. No COCs were detected in the surface water at the SDD.

Evaluation of site COCs under TNRCC RRR guidelines indicated residual constituent concentrations at SD007 presented no unacceptable risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use.

SD020 (SWMU17) (Building 4317 Oil/Water Separator): SD020 is located north of Building 4317 on the western end of the base. A former oil water separator (OWS) received fluids including waste fuels and oils discharged from Building 4317 aircraft maintenance activities. The system received approximately 1,500 gallons of waste fluids per week while in use. Water from the separator was discharged to the sanitary sewer, and separated hydrocarbons were disposed off-site through a contractor. The OWS system included a 500-gallon fiberglass reinforced plastic (FRP) tank underground storage tank (UST) and a separate 550-gallon collection tank that was installed in 1986 and removed as part of a voluntary action by the Base in 1995.

The following were identified as COCs for groundwater: 2-methylnaphthalene, benzene, and TPH. Evaluation of site COCs under RRS program guidelines indicated residual constituent concentrations at SD020 presented no risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use and limiting groundwater use to non-potable, with April 2003 approval of the Part B Permit and Compliance Plan Removal by TCEQ.

SD025 (SWMU23) (Building 5204 Oil/Water Separator): Site SD025 is located near the southern end of Second Street, on the southern portion of the Base. The site includes an OWS associated with SWMU 23 that was located adjacent to the northwestern corner of Building 5204, a flight-related maintenance shop. The OWS consisted of an FRP underground tank approximately 25 feet long and 8 feet in diameter. The OWS received approximately 500 gallons of waste fluids per week containing waste fuels, solvents, and oils discharged from Building 5204 floor drains. Water from the separator was discharged to the sanitary sewer, and separated hydrocarbons were disposed off-site through a contractor.

Evaluation of site COCs under RRS program guidelines indicated residual constituent concentrations at SD020 presented no risk to human health and the environment under the assumptions of commercial/industrial land use. The site was closed with LUCs prohibiting residential land use and limiting groundwater to non-potable use with April 2003 approval of the Part B Permit and Compliance Plan Removal by TCEQ.

SD028 (SWMU26) (Building 7040 Oil/Water Separators): Site SD028 is located in the central portion of Dyess AFB at the southwestern corner of Second Street and Avenue B. The site included two OWSs that were previously associated with Facility 7040, which was an accumulation point drum storage area that was used for wastes generated from maintenance and repair of motor vehicles and aircraft support equipment. The northern OWS was installed in 1986 and removed in 1995. The southern OWS, which was associated with a vehicle wash rack, was installed in 1986 and removed in 1995.

The OWSs each consisted of underground tanks constructed of concrete with a combined capacity of approximately 1,000 gallons. Waste fluids containing used oils, antifreeze, hydraulic fluid, and transmission fluid were collected in the tanks. Oils separated in the OWSs were pumped out for off-site disposal, and water was discharged to the sanitary sewer.

Site SD028 was recommended for closure under TNRCC RRS 1 for groundwater and RRS 3 for soils as a result of the 1998 CMI. The TNRCC concurred with the recommendations for site closure and removed Site SD028 from the Compliance Plan, which was approved 6 January 2000. A deed certification was filed in the Deed of Records of Taylor County 11 July 2000.

SD029 (SWMU27) (Building 8007 Oil/Water Separator): SD029 is located in the southern portion of the base, south of Buildings 8007 and 8008. The site included an OWS located south of Building 8008 that serves Building 8007. Building 8007 is used for 96th CES maintenance activities and includes an outdoor vehicle wash rack. The 50-gallon capacity OWS was installed in 1980 and removed 14 September 1995. The OWS received approximately 1,500 gallons of waste fluids containing waste fuels and oils per week. Separated hydrocarbons were pumped from the OWS for off-site disposal, and water was discharged to the sanitary sewer.

Site SD029 was recommended for closure under TNRCC RRS 3 for soils as a result of the 1998 CMI. The TNRCC concurred with the recommendations for site closure and removed Site SD029 from the Compliance Plan, which was approved 6 January 2000. A deed certification was filed in the Deed of Records of Taylor County 11 July 2000.

SS042 (Background Boring 2 (NR)): Site SS042 is located on the eastern portion of the base, near Base housing. During a Phase I investigation, the location was selected for investigation as a background location because it was not believed to have had contamination in the area. However, bromomethane and chloromethane were reported in the upper 15 feet of soil at concentrations ranging from 1,100 micrograms per kilogram (µg/kg) to 2,700 µg/kg and from 1,400 µg/kg to 4,300 µg/kg, respectively. Constituent concentrations were thought to be a result of previous storage of air conditioning units onsite. Sampling for SS042 indicated that these constituents did not exceed TNRCC MSCs.

Additional investigation results indicated that PAHs (chrysene, pyrene, and benzo(a)anthracene) and chromium were reported in soil samples collected from the site. Chromium was reported at concentrations exceeding the TNRCC MSC. Additional investigation was performed, and results indicated that the constituent concentrations initially identified in site soil were isolated detections. However, the most recent investigation results from the 1995 Final Interim RFI Report were unavailable for review. The 1996 Dyess AFB Corrective Action Management Plan states that no further action is anticipated at SS042. Additionally, the 1997 Management Action Plan states that the site was recommended for soil closure under RRS 2 and that closure was approved. No documentation of deed recordation for Site SS042 was identified as part of this FYR.

Goodfellow AFB – ST004, LF001, LF002, SS003, SS007, SS008, AOC002, and AOC005 ST004 (Fuel Storage Area): Underground storage tanks (USTs) containing aviation fuels were located south of the Farrow Street and east of Scherz Boulevard. Fuel was distributed from this location via underground pipeline and tanker truck to the flightline. The tanks were reported were taken out of service in 1958 and removed in 1976. It was noted on the tank removal project specifications to also remove contaminated soil, which had resulted from tank leakage. The remedial action for this site is biodegradation of the remaining fuel. Additionally, elevated levels of arsenic have been identified in the groundwater monitoring wells associated with this site. A contract is currently ongoing to address the Texas Commission on Environmental Quality (TCEQ) concerns of further delineating the arsenic plume.

LF001 (South Landfill): The South Landfill is geographically separated from the main base and located south of the base across highway FM 1223. The land was originally used as the south approach and clear zone for the original north/south main runway. Either prior to obtaining the land by the Air Corps, or during the early base years, a "gravel pit" was excavated in the center of the property. This ready- made pit conveniently became a landfill in the later years. The landfill occupies approximately 14 acres of a 33-acre parcel. LF-01 was operated as a general-purpose pit landfill from 1950, and was permitted by the state as a Class I landfill in 1982 (Permit #1501). The landfill was used until 1989 and was capped and closed September 1993. Contents include demolition debris, industrial waste, household solid waste, and some containerized liquids. This landfill served as the wet weather base landfill during the period when the trench landfill (LF-02) was being operated. The site was closed at industrial levels, and land use controls (LUCs) are currently in place.

LF002 (Southeast Landfill): The Southeast Landfill LF-02 is located in the southeastern corner of the base approximately 3,500 ft east of the South Gate. LF-02 was operated as a general-purpose trench landfill from 1970, and was permitted by the state as a Class I landfill in 1981 (Permit #1439). The trenches were approximately 600 feet long, 15 feet wide, 15 feet deep, and 3 feet apart. Civil Engineering operated waste collection trucks which operated on regular collection routes serving base facilities. Wastes disposed-of were predominantly household wastes which averaged 161 cubic yards per month and were collected from the main base and housing. The landfill was used until 1982 when the base changed to contract waste collection and disposal. The unused portion of the last trench last being used was leveled with fill dirt and the landfill operations ceased. LUCs are currently in place.

SS003 (Drum Storage Area): A storage area for several hundred metal drums was identified from aerial photos on the northwestern corner of the base approximately 500 ft west of the north gate. Aerial photographs of this area from the early 1950s show an area 100 to 150 ft in diameter used to store drums. Photographs after 1954 show that all the drums were removed and the area was graded. The site was investigated for petroleum hydrocarbon and lead contamination. There were some elevated levels of contamination, but not enough to require remedial clean-up actions. There are land use restrictions on this site which limits development to industrial/commercial use.

SS007 (Carbon Tetrachloride Spill Site): This site was designated in 2002 to address groundwater contamination from carbon tetrachloride that was being found in some of the groundwater monitoring wells both on and off base. No source of contamination was determined. The remedial action was completed. There are land use restrictions on this site which limits development to industrial/commercial use.

SS008 (Railroad Spur): This site was designated in 2003 from the conversion of AOC-06 (Railroad Tracks) into this new site. Investigation of arsenic, lead, and chromium levels was completed. There are partial land use restrictions on this site which limits development to industrial/commercial use along Scherz Blvd between Farrow St. and Kaydet St.

AOC002 (Aircraft/Vehicle Washracks): AOC-02 consists of nine former wash racks related to former aircraft maintenance hangers across the base. They were reportedly used for a variety of activities including cleaning of aircraft, vehicles, and associated parts and components and were used from the early 1940s to 1958 when the flight training mission ended. All of the wash racks were demolished and removed in the late 1980s before construction of Kearney Avenue. Because of limited hydrocarbon contamination, there are land use restrictions on this site which limits development to industrial/commercial use.

AOC005 (Warehouse/Maintenance Facilities): Three facilities, classified as areas of interest, were identified as facilities with historical activities that could have potentially created environmental conditions of concern. These facilities include the former motor pool, former machine shop, and the former pesticide storage facility. The contaminant of concern (COCs) are metals and carbon tetrachloride in the soil, and there are land use restrictions on this site which limits development to industrial/commercial use.

Sheppard AFB – FT001, FT003, LF004, LF005, LF006, WP009, WP010, and ST012 FT001 (Fire Training Area 1): Site FT001 is located in the southern portion of Sheppard AFB, within the former base golf course. The site was used from 1941 through 1957 for fire training exercises and consisted of a depressed burning area (located beneath the location of the green for the second hole of the former golf course) and three aircraft mockups. The frequency and duration of burns during the 1940s are unknown, but according to the Phase I Records Search (Engineering Science, 1984), four or five burns occurred each day on weekends during the 1950s. Each burn consumed approximately 400 to 500 gallons of the various waste oils and fuels. Fuels were reportedly deposited directly onto the ground, and no drainage collection system was operational at the site. The site was filled and graded in 1957, and the base golf course was subsequently constructed in this area.

After closure of Site FT001, the site was included in a Preliminary Assessment (PA) conducted for Perfluorinated Compounds (PFCs) at Sheppard AFB. Based on the findings of the PA, fire training operations were conducted at Site FT001 prior to the use of Aqueous Film Forming Foam (AFFF) at Sheppard AFB.

FT003 (Fire Protection Training Area 3): Site FT003 is located in the north-central portion of Sheppard AFB, north of an existing fire training area. The site was used for fire protection training exercises from approximately 1957 to 1992. Waste fuels were reportedly burned at the site during training exercises. The inactive site includes a former pump house and three former fire pits (a small fire pit, the T-34 fire pit, and the former T-38 fire pit). A drainage collection system previously routed waste fuel and water from the former T-38 fire pit to an oil/water separator (OWS). The liquid from the OWS discharged to an unlined evaporation pond (Closed Evaporation Pond), which was excavated, sampled, and backfilled in 1994. A second evaporation pond (Covered Evaporation Pond) was used and covered prior to installation of the drainage system.

After closure of Site FT003, the site was included in the PA conducted for PFCs at Sheppard AFB. Based on the findings of the PA, perfluorooctane sulfonate (PFOS)-based AFFF was previously used at FT003 during training activities. The AFFF was allowed to dissipate within an unlined burn pit and holding pond. The area was recommended for site inspection.

LF004 (Landfill 4): Site LF004 is located on the southern portion of the Base and encompasses a portion of the former Base golf course. Historical documents indicated Site LF004 was situated within the Site FT001 footprint; however, the Site LF004 boundaries were redefined by the Texas Natural Resource Conservation Commission (TNRCC) and Sheppard AFB in 1993 and no longer overlapped Site FT001. Historical documents also indicate that the LF004 boundary includes the former on-Base wastewater treatment plant located northeast of the former landfill. However, these boundaries were also redefined to exclude the area of the former wastewater treatment plant from the Site LF004 boundaries.

Trench and fill operations began at Site LF004 in 1941. Trenches were excavated to a depth of approximately 14 feet and filled primarily with household and municipal waste and then burned. The landfill periodically received other wastes including incinerator ash, sludges from the former on-Base wastewater treatment plant drying beds, and some hardfill and construction rubble. The western portion of the landfill was closed in 1952 due to the construction of the nearby Base housing. The remainder of the landfill was closed in 1957 and graded for construction of the Base golf course.

An unnamed creek positioned in a northeast-southwest direction extends through the site. The creek originated near the center of the Base as a stormwater collection ditch and exits the southern boundary of the Base just south of LF004. The creek also receives runoff from golf course irrigation within the boundaries of Site LF004 as well as upstream to the north of Site LF004.

Results from previous investigations identified site COCs as pesticides, metals, VOCs, and SVOCs. Concentrations of COCs remain in place above the RRS 2 criteria. A Closure Verification Report was submitted in 2006. TCEQ approved the recommendation for site closure under RRS 3 on 30 April 2007.

LF005 (Landfill 5): Site LF005 is located on the southeastern portion of the Base, within a fenced area south of the Wichita Falls Municipal Airport. The landfill was used to dispose and burn household and municipal waste and was in operation in the early 1960s for approximately three years. Trenches were positioned from east to west and were excavated to 10 to 14 feet. The trenches were then filled with native cover material.

Concentrations of COCs remain at the site above RRS 2 standards; therefore, an Affidavit to the Public, which serves as the deed certification, was filed indicating future owners or user to consult with the TNRCC (now TCEQ) prior to planning or initiating any activity involving disturbance of the landfill cover or monitoring system. Based on a letter dated 18 September 2001, TCEQ approved the deed certification and concurred that contaminants at the site had been remediated to meet non-residential soil criteria under RRS 3, and the facility was released from post-closure care responsibilities at the site.

During 2012, a Crash Damage/Disabled Aircraft Recovery (CDDAR) training course was constructed on adjacent property and was identified as overlapping the LF005 boundary. On 12 September 2012, the TCEQ visited the CDDAR and indicated there was no concern.

LF006 (Landfill 6): Former Landfill No. 3 encompasses approximately 100 acres in the northwest portion of the Base. An unnamed creek runs through the site and eventually empties into Bear Creek which trends east-west and comprises a portion of the northern Base boundary in the area of LF006. LF006 was active from about 1957 to 1972 and was used to dispose of typical base refuse, wastewater treatment plant sludge, waste oil, construction rubble, and incinerator ash. The landfill was a trench-and-fill operation with east-west trending trenches, each on average 12 to 15 feet wide, up to 100 feet long, and approximately 14 feet deep. Incineration of the refuse occurred once it was placed in the trenches, which was standard operating procedure until 1968.

From about 1965 to 1970, trenches in the northern area of the landfill reportedly also received waste oils and refuse; although previous investigation results have not confirmed this report. Settling within several areas of LF006 created surface depressions that outline the location of the former landfill trenches. Closed Installation Restoration Program (IRP) Site RW008, a low-level radioactive waste disposal area, is located near the center of LF006. IRP Site RW008 was closed according to the Nuclear Regulatory Commission regulations in February 1996 and is not included in this Five-Year Review (FYR).

A portion of Site LF006 (east central) was a disposal area for hardfill and other construction rubble. Historical information indicates the hardfill disposal area was used from the mid-1960s to the mid-1980s. The majority of the hardfill material was associated with on-Base structures that were damaged by tornadic and severe thunderstorm events. In addition, part of the extreme northern portion of LF006 was deeded to the City of Wichita Falls for the North Side Wastewater Treatment Plant.

Part of the southern portion of Site LF006 overlaps the boundary of Former Skeet Range 2, a Military Munitions Response Program (MMRP) site. Based on interviews with Sheppard AFB personnel, investigation and remediation activities conducted at the skeet range indicate that the soil impacted from skeet range activities did not extend onto the boundary of Site LF006. No sampling or remediation was conducted within the boundary of Site LF006.The site is entirely vegetated except for dirt roads that are present mainly on the perimeter edges of the former landfill.

A Closure Verification Report was submitted to TCEQ in 2005. Site LF006 was recommended for closure under RRS 3, and based on a letter dated 30 June 2006, TCEQ concurred with closure of the site under RRS 3 industrial land use scenario without post-closure care or engineering control measures and requested proof of deed certification. An Affidavit to the Public, which serves as the deed certification, was filed on 2 March 2007 indicating the remediation plan does not require post-closure care and the only LUC measure is to limit future use of the property to non-residential. Proof of filing the deed certification was submitted to TCEQ on 31 October 2007.

WP009 (WP-01): Site WP009 consisted of three former unlined waste pits that historically received spent solvents and hydraulic fluids from a nearby aircraft maintenance building (Building 2325). According to earlier reports, the northern pit was the first in operation and was the primary waste disposal pit. The middle and southern pits were constructed to provide overflow support for the northern pit. Based on aerial photograph reviews and employee interviews, the pits were approximately 10 feet deep and were used between 1966 and 1978 for disposal of waste engine cleaning fluids and solvents from nearby aircraft maintenance buildings. Disposal methods, materials, and inventory records are not available. According to earlier reports, the pits were backfilled with native soil in 1995. The pits were initially scraped and then covered with fill material from the surrounding area.

A Closure Verification Report was submitted to TCEQ in 2005. Site WP009 was recommended for closure under RRS 3. In a letter dated 30 June 2006, TCEQ concurred with closure of the site under RRS 3 industrial land use scenario without post-closure care or engineering control measures, and requested proof of deed certification. An Affidavit to the Public, which serves as the deed certification, was filed on 2 March 2007 indicating the remediation plan does not require post-closure care and the only LUC measure is to limit future use of the property to non-residential. Proof of filing the deed certification was submitted to TCEQ on 5 September 2007.

WP010 (Industrial Waste Pit): The Industrial Oil/Waste Pit (WP010) is located on the southern portion of the Base, north of the majority of the former Base golf course. The pit was an earthen structure, approximately 10 feet in diameter, and was used during the 1950s to collect waste oils and fuel from engine test cells and aircraft maintenance activities along the flight line. An industrial waste (“gunk”) line historically routed waste and wash water from the test cells to the earthen pit. On several occasions during the 1950s, the waste material in the pit was reportedly burned. Receipt of wastes from the test cell area was discontinued in the mid-1980s, after which, the waste pit only received overflow from an oil/water separator located to the north of the site. An 8-inch concrete pipe connected to the oil/water separator fed the pit, and overflow from the pit entered a second culvert that discharged into a nearby unnamed creek. The creek flows through the former golf course to the south and eventually off-Base. The culvert was approximately 80 feet in length and 12 inches in diameter, and field reconnaissance suggests that it was abandoned in place. The outfall is still visible near the unnamed creek. The waste pit received overflow from the oil/water separator until 1993 when all waste disposal was discontinued.

In January 1993, an interim corrective action was performed, and the pit and visibly-impacted soils were excavated. The excavation was extended to a depth between 4 and 6 feet where bedrock material was encountered. Following excavation, the material was disposed at an approved off-Base facility. The pit was backfilled with clean fill material, and a plastic linter and clay cap were installed over the pit. A 28-foot segment of the industrial waste line near the earthen pit was abandoned in place (crushed and backfilled). The interim corrective action was approved by the Texas Water Commission (TWC), now the TCEQ, and the area was graded to match the surrounding surface.

Site WP010 is not currently used and is located near the outer boundary of the driving range for the former Base golf course. The site is roughly triangular in shape, entirely vegetated, and surrounded on two sides by a chain-link fence. The third side (eastern) is bounded by heavy vegetation and the unnamed creek.

A Closure Verification Report was submitted to TCEQ in 2008. Site WP010 was recommended for closure under RRS 3, and based on a letter dated 1 May 2008, TCEQ concurred with closure of the site under RRS 3 industrial land use scenario and Class 3 groundwater under TRRP without post-closure care or engineering control measures. An Affidavit to the Public, which serves as the deed certification required for RRS3, was filed on 23 October 2008 indicating the remediation plan does not require post-closure care and the only LUC measure is to limit future use of the property to non-residential. TCEQ approved the deed certification requirements on 5 December 2008.

ST012 (Building 2000 Abandoned Underground Storage Tank (UST) Site): Site ST012 includes areas formerly designated as Area of Concern (AOC) 02 and AOC03, now referred to as the North and South UST Areas, respectively. The former UST systems at ST012 were used to store and supply petroleum-based fuel to a series of nearby generators and jet engine test cells that were once used for training exercises on the Base. The generators and jet engine test cells are no longer used at the Base. The area and surface structures located between the two AOCs that are not associated with historical fuel storage and distribution activities are not part of IRP Site ST012. The USTs have been removed from ST012, and unused vacant land characterizes the current condition of the former tank system locations.

Two 25,000-gallon tanks formerly located at the North UST Area were used to store diesel fuel for the power generation training activities. The USTs were reportedly installed in 1954 and abandoned in place prior to 1984. The USTs were excavated and permanently removed from the ground in April 1989. The North UST Area is located just north of Building 2010 between Avenue K to the west and a parking lot/tarmac to the east. Properties adjacent to the North UST Area include Avenue K and the former power generator facilities to the west; undeveloped land to the north; paved parking, road ways, and the active flight line to the east; and Building 2010 to the south. Building 2013 is located approximately 300 feet northeast of the North UST Area and is occasionally used for classroom training purposes. Building 2010 is used for administration and maintenance support and is the only facility adjacent to the North UST Area that is normally occupied during working hours.

During excavation and permanent removal of the UST systems from the ground completed from 1989 to 1992, subsurface soils affected by releases from the tanks were encountered. Grossly affected soils were removed and disposed at an authorized off-Base facility. Excavation of soils surrounding the former tank pits was performed until soil samples indicated petroleum hydrocarbon levels were below the TWC Petroleum Storage Tank Division guideline of 100 milligrams per kilogram (mg/kg). Each excavation was then lined with plastic sheeting and backfilled. Following these activities, the TWC concurred to “no further action” by the Air Force. However, during a 1996 parking lot expansion project conducted near the former AOC03 UST pit, petroleum hydrocarbon affected soils were encountered prompting Sheppard AFB to review the conditions at the site. A PA and RIs were conducted between 1996 and 2001.

Previous investigations at Site ST012 indicated that COCs for the site included fuel-related constituents TPH, VOCs, and PAH. Groundwater monitoring was conducted from 1998 through 2001, which documented the constituent concentrations in groundwater over time. A Closure Verification Report was submitted to TCEQ in 2003, and ST012 was recommended for closure under RRS 2. Based on a letter dated 21 February 2005, TCEQ concurred with closure of the site under RRS 2 industrial land use scenario without post-closure care or engineering control measures. An Affidavit to the Public, which serves as the deed certification, was filed on 5 December 2005 indicating the remediation plan does not require post-closure care and the only LUC measure is to limit future use of the property to non-residential. TCEQ approved the deed certification requirements on 8 May 2006.

Policy and Requirement Statements It is the policy of the Air Force to use innovative and sustainable approaches to environmental management and technology to accomplish…