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PUBLIC HEALTH ASSESSMENT

BARSTOW MARINE CORPS LOGISTICS BASE
(a/k/a MARINE CORPS LOGISTICS BASE BARSTOW)
BARSTOW, SAN BERNARDINO COUNTY, CALIFORNIA


Appendix E: Evaluation of Potential Public Health Hazards Associated with the
Installation Restoration Program Sites at Marine Corps Logistics Base Barstow

ATSDR determined that the IRP and RCRA sites listed here are not public health hazards because of one of the following reasons: 1) no site-related contaminants were present, 2) contaminant concentrations detected are too low to pose a health hazard, 3) past and current exposures have been prevented by strict security measures, and/or 4) affected areas have been or will be remediated. The solid waste management units (SWMU) and areas of concern investigated under the Resource Conservation and Recovery Act Facility Assessment are also summarized in Appendix F.

Evaluation of Potential Public Health Hazards Associated with the
Installation Restoration Program Sites at Marine Corps Logistics Base Barstow
MCLB Sites Site Description/
Waste Disposal History
Investigation Results/Environmental Monitoring Results1 Corrective Activities ATSDR'S Evaluation of Public Health Hazards
Operable Unit 1 (OU-1) - Groundwater at the Yermo Annex
Yermo Annex Plume This is a wide plume, contaminated with volatile organic compounds (VOCs), that consists of two co-mingled plumes. The northern plume arises from Building 573 and the southern plume originates from the domestic wastewater disposal and landfill areas. On-Base (plume)
VOCs: 1,2-DCE (4 ppb); 1,1-DCA (41 ppb); 1,2-difluoro-1,1,2,2,-tetrachloroethane (2 ppb); 1,2-difluoro-1,1,2,2,-tetrafluoroethane (2 ppb); bromodichloromethane (3 ppb); bromoform (17 ppb); 2-hexanone (8 ppb); chlorodibromomethane (10 ppb); PCE (230 ppb); and TCE (310 ppb).
SVOCS: bis(2-Ethylhexyl) phathalate (350 ppb).
Metals: Antimony (6.4 ppb); nickel (484 ppb); silver (511 ppb), and thallium (9.3 ppb).

On-Base (drinking water well) VOCs: TCE (25 ppb).

Off-Base (private wells)
VOCs: PCE (0.8 ppb), and TCE (0.6 ppb).

The areas of the contaminated plume that exceed EPA's MCL will be remediated, except for those areas located directly under waste management areas. The groundwater will be extracted at the following locations: four on-base wells at the CAOC 26 plume downgradient boundary, eight wells at the eastern base boundary, and four off-base wells at the plume boundary. The extracted water will be treated aboveground by activated carbon units and air sparging/soil vapor extraction (AS/SVE) systems, before being recharged into the aquifer. Groundwater monitoring will continue for the duration of the remedial action (about 30 years) with tests of treatment efficacy every 5 years. Metals (nickel, chromium, antimony, thallium, and aluminum) will also be sampled quarterly in the groundwater at CAOC 16 for one year to determine if these metals are naturally occurring or due to base activities. Groundwater: No public health hazard is associated with the groundwater at this site. Conservative estimates of potential past exposure show that there are no health hazards with consuming the maximum TCE concentration detected in the base production well.
Present and future exposures are not occurring because the base production wells were equipped with water treatment systems to remove organic contaminants.
Operable Unit 2 (OU-2) - Groundwater at the Nebo Main Base
Nebo North Plume (NRF-1) The north plume is believed to originate from the Warehouse 2 at the Old Repair Facility and appears to be contained within the base. VOCs: Chloromethane (8.9 ppb); 1,2-DCA (3 ppb); PCE (80 ppb), and TCE (4 ppb).
SVOCs: Benzene (1.2 ppb).
Metals: Arsenic (6.3 ppb); boron (1,920 ppb); and lead (5 ppb).
The source of the contamination will be removed at Warehouse 2, using the AS/SVE system, and natural attenuation will be used to reduce contaminant concentrations to levels at or below MCLs. A monitoring system will be put into place to monitor the progress of natural attenuation and a backup groundwater extraction system will provide containment backup if the natural processes are unable to contain the plume. Groundwater monitoring is required throughout the duration of the remediation action and the efficacy and cost-effectiveness of the treatment will be evaluated at 5-year intervals. Institutional controls that include access restrictions to prevent the use of untreated groundwater as drinking water in the areas of the plume (above MCLs) and potentially impacted water supply wells, will be implemented. Groundwater: No public health hazard is associated with the groundwater at this site. It does not appear that a completed exposure pathway existed as the base production wells were closed in 1975 due to high levels of dissolved solids. The VOC plume is still 0.25 mile away from the former base production wells. Present and future exposures are not occurring because the base's drinking water is supplied by the city of Barstow.
Nebo South Plume (NEP-4) The southern plume originates from the revetment areas of CAOC-6 and has migrated eastward. The plume has migrated 600 feet east of the boundary of the base. On-base (plume)
VOCs: Chlorodibromomethane (3 ppb); 1,2-dichlorethane (4 ppb); PCE (17 ppb); and TCE (422 ppb).
SVOCS: bis (2-Ethylhexyl) phthalate (26 ppb).
Metals: Arsenic (20.5 ppb); boron (1,130 ppb); and thallium (2.2 ppb).

Off-base (private well)
VOCs: TCE (11 ppb)

The portion of the contaminant plume that exceeds MCLs will be extracted through five groundwater extraction wells at the leading edge of the plume. The extracted groundwater will be treated aboveground with activated carbon units prior to being recharged into the aquifer through percolation ponds that are located downstream of the contaminant plume. A pilot study of the AS/SVE technology is ongoing at this site to determine if remediation time can be reduced, thereby increasing the cost-effectiveness of the treatment. Institutional controls that include access restrictions to prevent the use of untreated groundwater as drinking water in the areas of the plume (above MCLs) and potentially impacted water supply wells will be implemented. Groundwater: No public health hazard is associated with the groundwater at this site. It does not appear that a completed past exposure pathway existed as the base production wells were closed due to high levels of dissolved solids in 1975. The VOC plume is still 0.25 mile away from the former base production wells. Present and future exposures are not occurring because the base's drinking water is supplied by the city of Barstow.

Conservative estimates of potential past off-base exposure show that there are no health hazards with consuming the maximum TCE concentration detected in the private well adjacent to the Nebo Main Base.

Operable Unit 3 (OU3) - Eastern Part of Yermo Annex
CAOC 18- Sludge Waste Disposal Area CAOC 18 consists of 6 acres used for the disposal of paint sludges, degreasers, oil, and fuel from 1961 to the late 1970's. The wastes were disposed in an unlined channel that runs through the middle of the site. A geophysical survey showed no anomalies at this site. VOCs were not detected by a soil vapor survey.

Soil (0 to 3 feet)
91 soil samples were taken. Low levels of pesticides, metals, polychlorinated biphenyls (PCBs) and petroleum products were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action recommended. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 20 - Secondary Hazardous and Low-Level Radiological Area Low level radiological wastes and other hazardous substances were disposed of on this 3.2 acre site between 1956 and 1975. A geophysical survey showed several anomalies and 27 of 29 well locations remain unconfirmed.

Soil (0 to 3 feet)
Low levels of dieldrin and DDE were detected below ATSDR comparison values. Arsenic and beryllium were detected above ATSDR comparison values but below background levels. Concentrations of detected metals and radionucleotides are consistent with background levels.

One hundred and six soil samples were taken.

The Base Master Plan was modified to allow for limited activities (equipment storage and continued maintenance of adjoining railroad tracks) only.

Groundwater use is restricted below 5 feet.

Groundwater monitoring wells were installed in strata 1 and 2. Monitoring involves the sampling of one upgradient and one downgradient well once a year for 4 years. An evaluation will be performed in the fifth year to determine if continued monitoring is necessary. Other remediation actions include the modification of the concrete cap in stratum 1 to minimize infiltration and improved drainage control to facilitate rainwater runoff at strata 2 and 3.

No further action is required for stratum 3.

Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 21 - Industrial Waste Disposal Area This site was used for storage of drums containing waste oils, fuels, and antifreeze from 1946 to 1980. An underground storage tank (UST) is present on site. Lubrication oil, gasoline, and diesel fuel were disposed of in an arroyo (water course in an arid region) on the site. Fire training exercises, involving the use of flammable liquids, were conducted in two adjacent areas in the southern portion of the site in the mid-1960s. A geophysical survey determined the UST and pit dimensions, but the location of the arroyo could not be determined. VOCs and PCBs are present on the site.

Soil (0 to 3 feet)
Low levels of semivolatile organics, PCBs, and petroleum products were detected below ATSDR comparison values. The maximum lead concentration detected was 126 ppm.

No further action is required. Soil: No public health hazard is associated with the soil at this site. Contaminants were detected at levels below health-based guidelines.
CAOC 23 - Landfill Area CAOC 23, an L-shaped landfill about 60 acres in size, was used for the disposal/destruction of ammunition and equipment used in World War II as well and the Korean and Vietnam wars. The landfill was also used for the storage of wastes and rollback equipment, as well as the disposal of hazardous wastes (solid and liquid). Soil (0 to 3 feet)
Several anomalies were detected by the geophysical survey. Low levels of volatile organic, semivolatile organics, and pesticides were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels. Site-related metals were not detected in the soils.
A concrete cap will be installed over an eleven acre area (Zone 1) to minimize water infiltration and limit potential human exposure to buried wastes via containment. The Base Master Plan will be modified to prevent activities that would compromise the integrity of the cap. Monitoring associated with the landfill closure will also be performed at Zone 1.

No further action required for strata 3, 5, and 5a. Although stratum 1 (northern portion) and stratum 4 are considered to be protective, limited action has been agreed upon by the parties involved in the FFA. The limited action entails the excavation of several small geophysicial anomalies and consolidation under the Zone 1 cap, prior to a designation of "no further action."

A review of the selected remediation strategies will take place within 5 years to ensure that they provide adequate protection of human health.

Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 34 - Polychlorinated Biphenyl (PCB) Storage Area CAOC 34 consists of two basins used for the storage of sludge from the domestic sewage treatment plant at the facility and the disposal of PCB-containing waste (soil, drums and transformers). Soil (0 to 3 feet)
A geophysical survey showed no anomalies. Fifty soil samples were taken. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

PAHs: Benzo(a)anthracene (2.2 ppm);, benzo(a)pyrene (1.6 ppm); benzo(b)fluoranthene (2.4 ppm); benzo(g,h,i)perylene (1.5 ppm); dibenzo(a,h)anthracene (0.41 ppm); phenanthrene (4.7 ppm); and TRPH (1,800 ppm).

Pesticides/PCBS: Alpha-chlordane (0.950 ppm), Arochlor-1260 (2.5 ppm), and gamma-chlordane (0.630 ppm).

As part of a time-critical removal action in July 1994, the basins were removed and demolished. The surrounding soils, contaminated with PAHs, were also removed. A new industrial wastewater treatment and recycling facility has been constructed where the basins were formerly located. No further action required. Soil: No public health hazard is associated with the soil at this site. Past exposures would have been limited as this is an industrial site. Present and future exposures will not occur as the basins and surrounding soils have been removed.
Operable Unit 4 (OU4) - Nebo Main Base
CAOC 2 - Pesticide Shop and Washout Area CAOC 2 consists of 2.8 acres located on the north side of OU-4. There are 10 buildings and 2 washracks on-site that have been used for operations related to the golf course (equipment storage and repair and pesticide/herbicide storage). Cleaning of pesticide containers occurred primarily at two concrete pads (each 15 feet by 17 feet). Geophysical and soil vapor surveys were conducted at this site.

Soil (0 to 3 feet)
The pesticides, DDT (maximum = 72.3 ppm), DDE (maximum = 7.1 ppm), and DDD (maximum = 4.5 ppm) were detected above ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

The southern of the two concrete pads and surrounding contaminated soil was excavated and demolished in 1994. No further action is required. Soil: No public health hazard is associated with the soil at this site. Past exposures would have been limited as this is an industrial site and access is restricted by a fence. Present and future exposures will not occur as the concrete pads and surrounding soils have been removed.
CAOC 5 - Chemical Storage Area CAOC 5, used for storage of rollback equipment, pesticides and other hazardous substances, is located on the southeastern portion of OU-4. The site was is operation from 1940 to 1978. An unpaved 10 to 15-acre site was used to store DDT in cardboard cartons, drums, or paper bags. A geophysical survey indicated several anomalies.

Soil (0 to 3 feet)
VOCs were not detected. Chlorinated pesticides and Arochlor-1260 were detected below ATSDR comparison values. Arsenic and beryllium were detected above ATSDR comparison values, but below background levels. One hundred and eighteen soil samples were taken.

The containers of DDT were removed and disposed in 1975/76. The top 6 inches of soil in the DDT storage area were removed and disposed of in 1978. No further action is required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 9 - Fuel Disposal Area The Fuel Disposal Area is located on the southern boundary of OU-4 and was used for the disposal of gasoline, diesel fuel, and lubrication oils. An unlined stormwater drainage channel runs through the middle of the site. Waste fuel and oil generated by vehicle maintenance activities were disposed of in the southern portion of this channel in the early 1950s. A geophysical survey showed no anomalies at this site and a soil vapor survey did not detect any VOCs.

Soil (0 to 3 feet)
Petroleum hydrocarbons were detected below ATSDR comparison values. Arsenic and beryllium were detected above ATSDR comparison values, but below background levels. Twenty-five soil samples were collected.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 11 - Fuel Burn Area CAOC 11 (240 feet by 680 feet) is a located on the southwest portion of the Nebo Main Base, near CAOC 9. Waste diesel fuel and gasoline from the repair division shops were burned in depressions in the ground at this site. The site was in operation from the 1940s to the 1960s. A geophysical survey showed no anomalies at this site. VOCs were not detected by a soil vapor survey.

Soil (0 to 3 feet)
Petroleum hydrocarbons were detected in most samples below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels. Twenty soil samples were taken.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
Operable Unit 5 (OU-5) - Yermo Annex
CAOC 15/17 - Oil Storage/ Spillage and Industrial Wastewater Treatment Plant (IWTP) Areas CAOC 15/17 are two overlapping sites that encompass 13 acres, which were combined and investigated as one site. Documents indicate that waste oil, gasoline, and diesel fuel were stored at CAOC 15 as defueling activities were conducted between 1961 and 1980. CAOC 17 consists of 15 evaporation ponds, four sludge drying beds, a temporary pond, and a overflow areas around the pond; all of which are associated with the IWTP. A geophysical survey (utility clearance only) indicated no anomalies. VOCs were detected in a soil vapor study.

Soil (0 to 3 feet)
Twenty-nine soil samples were taken in Phase I; 24 soil samples and four concrete samples were taken in Phase II.

Total chromium was detected in the soils during the Phase I RI and the possibility that the industrial effluent entering the evaporation basins contained dissolved metals, prompted Phase II sampling for hexavalent chromium species. Phase II sampling indicated that hexavalent chromium species are present at a maximum concentration of 2.1 mg/kg (below ATSDR comparison levels). Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 16 - Building 573 and Perimeter Area CAOC16 is the main work area of the MCLB repair division and encompasses Building 573 and the underground waste water piping between the building and the IWTP. Building 573 is used for operations associated with the maintenance and repair of military vehicles and hardware. The area around Building 573 is covered with concrete which is 10 inches thick. Organic solvents such as tetrachloroethylene and trichloroethylene as well as chemical paint strippers, abrasives, chromates, sulfuric acid, lead, and chromic were used in operations at this site. A geophysical survey showed utility clearance and delineated the underground storage tank. A soil vapor study indicated that VOCs and benzene, toluene, ethylene, and xylenes (BTEX) were present. Twelve soil samples were taken. Five underground storage tanks were removed in 1992 under the RFA program.
A restriction on activities that may compromise the existing concrete cover at CAOC 16 will be imposed. Signs will be placed on the boundaries of the site to indicate which activities are restricted. The Base Master Plan will be modified to incorporate these restrictions.
Soil: No public health risks are associated with soil at this site. The concrete paving prevents a completed exposure pathway. The restriction on activities permitted at the site will further minimize the potential for present and future exposure by facilitating the containment of the soils.
CAOC 19 - First Hazardous and Low-Levels Radiological Area This site (1,000 square feet) was used for the storage of low-level radioactive equipment and hazardous materials. The materials are reported to have been removed in the 1960s. A geophysical survey indicated utilities clearance and anomalies. VOCs were detected in the soil vapor survey.

Soil
Tritium was detected above background levels. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels. Seventeen soil samples were collected in Phase I.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 21 - Industrial Waste Disposal Area CAOC 21 consists of a number of concrete foundations from barracks formerly located on the site and an electrical substation. The site is 1,200 feet by 400 feet. The site was used from 1946 to 1980, during which time a variety of waste operations were conducted. During fire training exercises, the foundations of the barracks were covered with flammable chemicals and ignited. An underground storage tank is located in the fire training area. This site was originally included in OU-3, but was moved to OU-5 due to concerns about scheduling of sampling and analysis of data required for this investigation. A geophysical survey delineated UST and pit dimensions, but the arroyo location could not be determined. Fifty-one soil samples were collected in Phase I and 16 soil samples were collected in Phase IIa.

Soil (0 to 3 feet)
PAHs: TRPH (7,950 ppm).

Pesticides/PCBs: Arochlor-1260 (248 ppm), furans (0.54 ppb), and dioxins (1.63 ppb).
Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Access is restricted due to the industrial nature of the site which is bordered by a railroad track and a drainage ditch.
CAOC 22 - Domestic Wastewater Disposal Area CAOC 22 contains three unlined percolation ponds and associated overflow, covering about 4 acres. Between 1952 and 1958, treated wastewater consisting of domestic and industrial wastes was disposed of in the ponds. The pesticide malathion was used for insect control in the ponds. The percolation ponds also received treated effluent from the old (1952 - 1976) and the new (1976 to the present) domestic wastewater treatment plants. A geophyiscal survey did not detect anomalies. VOCs were detected by a soil vapor survey; 12 soil samples were taken.

Soil (0 to 3 feet)

Organochlorine pesticides were detected sporadically in surface soil below ATSDR comparison values.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 24 - Tracked Vehicle Test Area Between 1961 and 1980, waste oil and industrial wastewater was sprayed onto an elliptical area (4,500 feet by 500 feet) for dust suppression. A geophyiscal survey did not detect anomalies. VOCs were detected by a soil vapor survey; six soil samples were taken.

Soil (0 to 3 feet)
Arsenic and barium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 26 - Building 533 Waste Disposal Area Building 533 is the Packaging Maintenance Shop where "work pieces" are cleaned, repaired, painted, preserved and packaged. The facility uses and generates paint thinner, waste oil, paint sludge, spent solvent, sandblast grit, and wastewater containing the above materials. The area around the building includes a steam cleaning rack, an oil/water separator, a sump, and an area of discolored soil. A geophysical survey (utility clearance) delineated the location and dimensions of an underground storage tank and indicated that anomalies A-1 and A-2 were present. A soil vapor survey indicated that VOCs are present. Phase I sampling consisted of 43 soil samples. Phase II sampling included 49 soil vapor samples, one vertical profile boring, and one groundwater well.

Soil (0 to 3 feet)
Pesticides were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 27 - Building 436 Fuel Oil Storage Area This 1.5 acre site is the location of the former boiler plant, housed in Building 436, which was in operation until 1978. It has been estimated (by the IAS - Brown and Caldwell, 1983) that 30,000 gallons of fuel oil and associated wastes were discharged into the ground at this site. A geophysical survey delineated an underground storage tank and indicated that anomalies were present. VOCs were detected in a soil vapor survey. Twenty-eight soil samples were taken.

Soil (0 to 3 feet)
PAHs: TRPH (60,000 ppm)

Pesticides were detected below ATSDR comparison values. Arsenic was detected above the ATSDR comparison values, but below the background level.

No further action was required. Soil: No public health hazard is associated with the soil at this site. Access is restricted due to the industrial nature of the site and fencing in the area.
CAOC 28 - West Lot, Dust Control Area CAOC 28 is located in the northwest corner of OU-5 and was used for storage, maintenance-related, and railroad-related activities. Dust suppression activities occurred between 1965 and 1978 and involved the use of wastewater and waste oil. An asphalt like material, known as "desert mix" was also used to suppress dust. At present, this site is a storage area. A geophysical survey indicated that anomalies were present. A soil vapor study detected VOCs. Sixteen soil samples were collected.

Soil (0 to 3 feet)
Pesticides were detected below ATSDR comparison values. Arsenic and barium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 29 - Sludge Storage Area The sludge storage area is also located in the northwestern corner of OU-5 and covers 2.5 acres. Sludge, generated by the ponds associated with the sanitary wastewater treatment plant, is stored in two 0.5 acre areas (approximately 500 cubic yards of sludge). A geophysical survey indicated that anomalies were present. VOCs were detected in a soil vapor study. Six soil samples were taken.

Soil (0 to 3 feet)
Arsenic was detected above the ATSDR comparison value, but below the background level.

The sludge was partially removed in 1978. No further action is required Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 30 - Locomotive Repair Shop Disposal Area CAOC 30, located on one acre of land, is the site of past and current locomotive repair shop. Operations conducted at the site utilized diesel, gasoline, lubricating oils, and grease which were routinely discharged to the ground in unknown quantities. A geophysical study (utility clearance only) was conducted. VOCs were detected in a soil vapor study. Seventeen soil samples were collected.

Soil (0 to 3 feet)
PAHs: TRPH (1,000 ppm).

Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action is required. Soil: No public health hazard is associated with the soil at this site. Access is restricted due to the fence which surrounds the area.
CAOC 31 - North Vehicle Test Track Road CAOC 31 is a road (6,500 feet long and of varying widths) that is located in the north central portion of the Yermo Annex. Dust suppression activities, using waste oil and wastewater effluent, occured infrequently. A geophysical study (utility clearance only) was conducted. VOCs were detected in a soil vapor study. Five soil samples were collected.

Soil (depth unspecified)
PAHs: TPH (2,300 ppm).

Organochlorine pesticides were detected below ATSDR comparison values.

No further action required. Soil: No public health hazard is associated with the soil at this site. Access is partially restricted by fencing, so exposure is unlikely and infrequent if it does occur.
CAOC 32 - Preservation and Packaging Storage Area This site, covering 1.5 acres, contains the preservation shop (Building 203), a drum storage area, a steam wash rack, sump, and associated piping as well as the former location of an excavated underground storage tank. Military equipment are preserved and decommissioned at this site. Materials used and stored at this site include paints, oils, fuels, thinners, and solvents. Hazardous material used in preservation and packaging processes were stored at the site from 1960 to 1980. A geophysical study delineated excavation and piping. VOCs were detected in a soil vapor study. Seventeen soil samples were collected in Phase I sampling, while 52 samples were screened for PCBs in Phase II evaluation. An isolated detection of the PCB, Arochlor-1242 in Phase I, prompted Phase II confirmatory sampling. No PCBs were detected during Phase II sampling.

Soil (0 to 3 feet)
Pesticides: Arochlor-1242 (5.7 ppm).

Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Access is partially restricted by fencing, so exposure is unlikely and infrequent if it does occur.
CAOC 35 - Class III Landfill CAOC 35 is a 17.4 acre site located just north of the industrial wastewater treatment plant in the northeastern portion of OU-5. The landfill was in operation until 1989 and the wastes disposed at the site include domestic refuse with some commercial and industrial wastes (such as wood, paper, and plastic packing materials). The solid waste is reported to be buried in 24 trenches which are 400 feet long, 40 feet wide, and 10 feet deep. The site is currently enclosed by a chain link fence with a gate located at the southwest side. Various pieces of debris such as cables are exposed at the surface. A geophysical survey (utility clearance) defined the landfill boundaries and indicated that anomalies A35-1 through A35-7 were present. VOCs were detected by a soil vapor survey. Seventeen soil samples were collected.

Soil (0 to 3 feet)
Pesticides were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

A soil cap will be installed over a 15-acre area in the western portion of stratum 1 (Zone 1). Groundwater monitoring for landfill closure will be conducted at Zone 1. A restriction on activities that could compromise the integrity of the soil cap will be implemented, including posting signs at the perimeter of the site and modifying the Base Master Plan to prohibit such activities.

No further action is required for strata 1 (eastern portion) and 2.

Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 36 - Proposed Combat Vehicle Maintenance Shop This site is the proposed location of the combat vehicle maintenance shop. It is located on 1.5 acres in the eastern portion of OU-5. Available records do not describe the historic waste handling practices conducted at this site, but it is assumed that they were related to storage and activities conducted at the Repair Division, Building 573. No anomalies were found in a geophysical survey. VOCs were detected in a soil vapor survey. Six soil samples were collected.

Soil (0 to 3 feet)
Organochlorine pesticides were detected below ATSDR comparison values. Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
Operating Unit 6 - Nebo Main Base
CAOC 1 - Landfill North of the Golf Course CAOC 1, in operation from the 1940s to 1960, has been used for the disposal of road construction debris, dried sludge from the Nebo Main Base wastewater treatment plant, and asphalt. This site is located just north of the golf course in the Nebo Main Base. A geophysical survey delineated the landfill and indicated the presence of anomalies A-1 through A-4. VOCs were detected in a soil vapor survey. Twenty-one soil samples were taken.

Soil (0 to 3 feet)
PAHs: Benzo(a)pyrene (0.580 ppm).
Pesticides were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Access is partially restricted by fencing, so exposure is unlikely and infrequent if it does occur.
CAOC 3 - Wastewater Disposal Area This site includes the golf course and the overflow area of the evaporation and percolation ponds that are located 2,000 feet east of the golf course. Wastewater was disposed of in the evaporation and percolation ponds between 1952 and 1974. Secondary effluent was used to water the golf course from 1952 to 1972 and from 1978 to the present. A geophysical survey delineated the potential groundwater contamination sources and indicated the presence of an anomaly. VOCs were detected in a soil vapor survey. Twenty-two soil samples were collected.

Soil (0 to 3 feet)
Pesticides were detected below ATSDR comparison values. Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required for strata 1 and 2. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 4 - Old Trap and Skeet Range Area CAOC 4 was used for the storage of wooden containers of calcium hypochlorite in the 1940s. It is reported that the containers were buried in a gully during the 1950s after some containers broke and a fire resulted. A geophysical survey delineated the disposal areal and indicated the presence of anomalies. VOCs were detected in a soil vapor survey. Twenty-two soil samples were collected.

Soil (0 to 3 feet)
PAHs: Benzopyrene (0.270 ppm).

Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action required. Soil: No public health hazard is associated with the soil at this site. Access is partially restricted by fencing, so exposure is unlikely and infrequent if it does occur.
CAOC 6 - Original Trash Landfill Areas CAOC 6 is located on the eastern side of the drainage ditch which is located north of Interstate 40. The storage of 80 tons of DDT and related material, as well as equipment occurred in bermed revetments. Although landfilling has been reported at the site, this could not be confirmed by evidence gathered by the remedial investigation. A geophysical survey delineated the landfill boundaries and indicated the presence of anomalies. VOCs were detected in a soil vapor survey. Twenty-one soil samples were taken.

Soil (0 to 3 feet)
Pesticides were detected below ATSDR comparison values. Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action is required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 7 - Drum Storage and Landfill Areas This site, located in the southeast corner of OU-6, consists of two landfill trenches that are arranged in an "L"-shaped configuration. The volume of waste at the landfill is estimated to be 40,000 cubic yards. The waste consists of garbage, industrial solid waste, scrap metal, insulated copper wires, and paint cans. Drum storage and the combustion of flammable liquids were also conducted at this site. The ash generated by combustion of flammable liquids was covered with soil. A geophysical survey delineated the landfill and indicated the presence of anomalies. VOCs were detected in a soil vapor survey. PCBs were not detected at the site. Sixty-two soil samples were taken.

Soil (0 to 3 feet)
PCBs: Arochlor -1254 (4.2 ppm) and Arochlor-1260 (0.330 ppm).

Metals: Cadmium (230 ppm) and lead (839 ppm).
Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.

A soil cap will be installed over a 9-acre area in strata 1 and 2. The Base Master Plan will be modified to restrict activities that could affect the integrity of the cap. Signs will be posted at the boundary of the cap indicating which activities are prohibited in the area. Groundwater monitoring of one upgradient and two downgradient wells will occur once a year for 5 years, at which time an evaluation will be conducted to determine the necessity of further action. This approach will minimize water infiltration and potential human exposure to buried wastes through containment of the waste.

No further action is required for strata 3 and 4.

Soil: No public health hazard is associated with the soil at this site. Access is restricted due to the industrial nature of the site, so exposure is unlikely and infrequent if it does occur.
CAOC 8 - Building 197 Wastewater Disposal Area This site is located at the northeast corner of the machine shop in Building 197 which was used for machine cleaning operations. Chemicals used in the cleaning operations include acid solutions, solvents, alkaline cleaners, and detergent. The wastes are reported to have been discharged through a drain in the floor and allowed to percolate in the ground under the building. A geophysical survey did not detect the presence of any anomalies. VOCs were not detected in a soil vapor survey.

Soils (0 to 3 feet)
Six soil samples were collected. Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 12 - Radiator Cleaning Chemical Disposal Area Vehicle radiator cleaning operations were conducted in an oval-shaped area at this site which is located 30 feet northeast of a tank farm. This site is currently unpaved and has no structures located on it. A geophysical survey (utility clearance only) did not detect the presence of any anomalies. VOCs were not detected in a soil vapor survey.

Soils (0 to 3 feet)
Eighteen soil samples were collected. Arsenic was detected above the ATSDR comparison value, but below the background level.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 13 - Preservation and Packaging Storage Area CAOC 13 contains the site of a former storage area (800 square feet) and open space (400 square feet). The building once housed at this site had a concrete floor and was used for storing paints, thinners, and solvents. The building was destroyed by fire in 1957. A geophysical survey delineated the presence of underground pipes did not detect the presence of any anomalies. VOCs were not detected in a soil vapor survey.

Soils (0 to 3 feet)
6 soil samples were collected. Arsenic and beryllium were detected above ATSDR comparison values, but below background levels.

No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.
CAOC 14 - Drainage Channels and Mojave Riverbed Outfalls CAOC 14 is comprised of three stormwater drainage channels (the Nebo Main base surface drainage system) and four outfalls that discharge into the Mojave River. While small portions of the outfalls and drainage channels are lined with concrete, the majority of the system consists of unlined trenches. Wastewater from several operations at the Nebo Main Base was discharged into the channels and outfalls from 1940 to 1970. Other wastes, such as oils, fuels, and pesticides were also discharged into the channels. Neither a geophysical survey nor a soil vapor study was conducted. 40 soil samples were collected.

Soils (0 to 3 feet)
PAHs: Benzo(a)pyrene (0.380 ppm).

Arsenic and barium were detected above ATSDR comparison values, but below background levels.

No further action is required. Soil: No public health hazard is associated with the soil at this site. Access is restricted due to the industrial nature of the site, so exposure is unlikely and infrequent if it does occur.
Nebo Main Base Riparian Fringe Habitat As the riparian fringe habitat is located near four potential sources of contamination (CAOC 1, 2, 3, and 4), it was included in the Phase I assessment of OU-5 and OU-6. The riparian fringe habitat (5,000 feet by 250 feet) was defined in the Phase I ecological assessment as an ecologically sensitive area. The area has been disturbed significantly by flood control practices, grading, and artificial drainage channels from Nebo Main Base and golf course. Soils (0 to 3 feet)
Arsenic, barium, and beryllium were detected above ATSDR comparison values, but below background levels.
No further action required. Soil: No public health hazard is associated with the soil at this site. Past, present, and future exposures are unlikely because access is restricted due to the industrial nature of the site.

1Chemicals listed exceed ATSDR comparison values
Underlining indicates that neither ATSDR comparison values or EPA RBCs are available.
PAHs = polycyclic aromatic hydrocarbons
TPH = total polycyclic aromatic hydrocarbons
TRPH = total recoverable polycyclic aromatic hydrocarbons
VOCs = volatile organic compounds
SVOCs = semi-volatile organic compounds
Data are from Southwest Division Naval Facilities Engineering Command. 1998. Record of Decision for Marine Corps Logistics Base Barstow, Barstow, California. January 1998 (OU-1 and -2), April 1998 (OU-3 and -4), and May 1998 (OU-5 and -6).


APPENDIX F. SUMMARY OF RCRA FACILITY ASSESSMENT SITES AT MCLB

Group 1 - RFA Sites Transferred to LUFT Program
SWMU/AOC SWMU/AOC Name Comments
9.53 UST T-401  
9.54 UST T-441  
9.55 UST T-443  
9.56 UST T-479  
9.57 UST T-481  
9.58 USTs T-484a,b  
9.59 UST T-486  
9.60 USTs T-530a,b UST T-530a; UST T-530b included in Group 6
9.62 UST T-536  
9.63 UST T-558  
9.65 USTs T-574a,b  
9.66 UST T-579  
9.67 UST T-580a  
9.68 USTs T-588a,b UST T-588a (septic tank); UST-588b included in Group 6
9.69 USTs T-590a,b,c  
9.70 USTs T-590d  
9.73 UST T-598  
9.74 UST T-610  
9.75 UST T-614  
9.77 UST T-625  
10.42 UST T-2a  
10.44 UST T-10  
10.45 UST T-15  
10.46 UST T-17  
10.47 UST T-19d  
10.48 USTs T-19a,b,c  
10.50 USTs T-43a,b  
10.51 UST T-48  
10.52 USTs T-71a,b  
10.53 UST T-74  
10.54 UST T-103  
10.55 UST T-149  
10.56 UST T-155  
10.57 UST T-157  
10.58 UST T-170  
10.59 USTs T-181a,b  
10.60 UST T-189a  
10.62 UST T-197  
10.63 UST T-203  
10.64 UST T-204  
10.65 USTs T-213a,b,c  
10.66 UST T-218  
10.67 USTs T-225a,b  
10.69 UST T-234a  
10.70 USTs T-251a,b,c  
10.71 UST T-251d  
10.72 UST T-271a  
10.73 UST T-271b  
10.74 UST T-290  
10.75 USTs T-322a,b  
10.76 UST T-325  
10.77 UST T-327  

Notes:

RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
LUFT - Leaking Underground Fuel Tank Program
SWMU- Solid Waste Management Unit
AOC- Area of Concern
UST- underground storage tank


Group 2 - RFA Sites Closed with No Action Required Based on PR/VSI Results
SWMU/ AOC SWMU/AOC Name Comments
9.2 Low-Level Radioactive Material Storage Warehouses  
9.10 90-Day Accumulation Site  
9.13 Mechanical Shop - CWC 717  
9.45 Metrology Business Center  
Y-4 Accumulation Area For Rubble  
Y-5 Polychlorinated Biphenyl (PCB) Transformer Area  
10.2 General Warehouse  
10.8 Wood Working Hobby Shop  
10.11 Photo Shop  
10.16 Old Auto Hobby Shop and Post Exchange Service Station  
10.30 Training Toxic Gas Storage Area  
10.33 90-Day Waste Accumulation/Storage Facility  

Notes:

RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
PR/VSI - Preliminary Review/Visual Site Inspection
SWMU- Solid Waste Management Unit
AOC- Area of Concern
CWC - Cost Work Center


Group 3 - RFA Sites Fully Addressed under CERCLA Operable Units 1 through 6
SWMU/ AOC SWMU/AOC Name Comments
9.4 Packaging and Maintenance Shop  
9.8 Boiler  
9.9 Locomotive Repair (formerly Building 479)  
9.12 Old Hazardous Waste Storage Facility  
9.14 Preservation Shop - CWC 744  
9.16 Laboratory - CWC 622  
9.17 Nondestructive Testing Shop - CWC 651C  
9.18 Engine Rebuild Shop - CWC 719/721  
9.19 Transmission Shop - CWC 711  
9.20 Wheeled Vehicle Shop - CWC 714  
9.21 Small Arms Shop - CWC 721  
9.22 Optics Shop - CWC 728  
9.23 Combat Track Vehicles Shop; Turret Shop - CWC 723, 725, 729  
9.24 Combat Track Vehicles Shop (Pneudraulics) -CWC 726  
9.25 HAWK Ground to Air Missile Shop - CWC 734  
9.26 Marine Tactical Data System (MTDS) and Launcher Shops - CWC 733 and 737  
9.27 Radar Shop - CWC 735  
9.28 Communications Electronics Shop- CWCs 731,732, and 738  
9.29 Welding Shop - CWC 743  
9.30 Body Shop - CWC 718  
9.31 Machine Shop - CWC 741  
9.32 Sheet Metal Shop - CWC 742  
9.33 Shelter Shop - CWC 745  
9.34 Undercoating Operations and Final Paint Shops - CWC 746  
9.35 Finalizing and Camouflage Shops - CWC 749  
9.36 Wash Rack (Steam Cleaning Shop) - CWC 746  
9.37 Clean/Paint Shop, Clean/Canvas Shop, Chemical Cleaning and Painting Areas -CWC 747/748  
9.38 Clean/Paint Shop, Clean/Canvas Shop, Abrasive Blasting Area - CWC 747/748  
9.39 Clean/Paint Shop, Clean/Canvas Shop, Canvas Shop, Graphics Area, Brush/Plating Area - CWC 747/748  
9.40 Landing Vehicle Tank (LVT) Test Tank  
9.41 Satellite Accumulation Station (SAS) and Temporary SAS for Marine Corps Multi-Commodity Maintenance Center (MC)3  
9.42 Metals Collection Point (MCP)-4  
9.43 Industrial Wastewater Collection Lines  
9.44 Safety Kleen Part Cleaner Units  
9.49 Industrial Wastewater Treatment Plant  
9.61 UST T-533  
9.64 USTs T-573a,b,c,d,e  
9.72 UST T-596  
9.84 CAOC 15 - Oil Storage and Spillage  
9.85 CAOC 16 - Battery Acid Disposal  
9.86 CAOC 17 - Industrial Wastewater Overflow Area  
9.87 CAOC 18 - Sludge Waste Disposal Area  
9.88 CAOC 19 - First Hazardous and Low-Level Radiological Storage Area  
9.89 CAOC 20 - Second Hazardous and Low-Level Radiological Storage Area  
9.90 CAOC 21 - Industrial Waste Disposal Area  
9.91 CAOC 22 - Domestic Wastewater Disposal  
9.92 CAOC 23 - Landfill Area  
9.93 CAOC 24 - Tracked Vehicles Test Track  
9.94 CAOC 25 - Wastewater Treatment and Sludge Disposal  
9.95 CAOC 26 - Waste Disposal Area  
9.96 CAOC 27 - Fuel Oil Storage Tank  
9.97 CAOC 28 - West Lot Dust Control  
9.98 CAOC 29 - Sludge Storage Area  
9.99 CAOC 30 - Locomotive Repair Shop Disposal Area  
9.100 CAOC 31 - North Vehicle Test Track Road  
9.101 CAOC 32 - Preservation and Packaging Storage Area  
9.102 CAOC 34 - Polychlorinated Biphenyl (PCB) Storage Area  
9.103 CAOC 35 - Landfill North of Industrial Wastewater Treatment Facility  
9.104 CAOC 36 - Proposed Paint Combat Vehicle Maintenance Shop  
9.105 CAOC 37 - Groundwater Contamination (Yermo Annex)  
9.119 Pump House - Fuel Oil  
9.122 Boiler House  
Y-1 Contaminated Soils at Marine Corps Multi-Commodity Maintenance Center (MC)3  
Y-3 Drainage Ditch  
Y-7 Yermo Aerial Infrared Thermographic Survey TAs 1, 2, 5, 6A, 6B, 7-11, 13-15, 20, 23, 24; other TAs included in Groups 5 and 6
10.68 UST T-227  
10.85 CAOC 1 - Landfill North of the Golf Course  
10.86 CAOC 2 - Pesticide Storage and Washout Area  
10.87 CAOC 3 - Wastewater Disposal Area  
10.88 CAOC 4 - Old Trap and Skeet Range Area  
10.89 CAOC 5 - Chemical and Materials Storage Area  
10.90 CAOC 6 - Original Trash Landfill  
10.91 CAOC 7 - Drum Storage and Landfill  
10.92 CAOC 8 - Building 197 Waste Disposal Area  
10.93 CAOC 9 - Fuel Disposal Area  
10.94 CAOC 10 - Sodium Valve Burial Site  
10.95 CAOC 11 - Fuel Burn Area  
10.96 CAOC 12 - Radiator Cleaning Chemicals Disposal Area  
10.97 CAOC 13 - Preservation and Packaging Storage Area  
10.98 CAOC 14 - Mojave River Bed  
N-3 Nebo Aerial Infrared Thermographic Survey TAs 1, 15, 17-19, 23,24,26-29, 35; other TAs included in Group 5
11.1 CAOC 33 - Rifle Range Disposal Area  

Notes:

RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
SWMU- Solid Waste Management Unit
AOC- Area of Concern
UST- underground storage tank
CAOC- CERCLA Area of Concern
TA- thermal anomaly
CWC - Cost Work Center


Group 4 - RFA Sites Managed under Other Regulatory Programs, Processes, or Permits
SWMU/AOC SWMU/AOC Name Comments
9.11 New Defense Reutilization and Marketing Office (DRMO) Hazardous Waste Storage Facility Hazardous Waste Facility Permit
11.2 Rifle Range Impact Area Department of Defense (DoD) Guidance
11.3 Pistol Range Impact Area DoD Guidance
11.4 Machine Gun Impact Area DoD Guidance

Notes: RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
SWMU- Solid Waste Management Unit


Group 5 - RFA Sites Closed with No Action Required Based on RFA Sampling Results
SWMU/ AOC SWMU/AOC Name Comments
9.1 Low-Level Radioactive Waste Storage Areas  
9.3 Hazardous Material Storage Warehouses  
9.5 Preservation Shop, POL Area and Strip 8  
9.6 Garrison Mobile Equipment  
9.7 Garrison Mobile Equipment  
9.46 Boiler Plant  
9.47 Old Municipal Wastewater Treatment Area and Effluent Ponds  
9.48 New Municipal Wastewater Treatment Area and Effluent Ponds  
9.71 UST T-593  
9.76 UST T-616  
9.106 Maintenance Shop  
9.107 Vehicle Maintenance Shop  
9.108 Motor Repair and Battery Shop  
9.109 Sheet Metal Shop  
9.110 Boiler House  
9.111 Booster Pump House  
9.112 Gas Station  
9.113 Garage  
9.114 Paint Warehouse  
9.115 Cooling Tower  
9.116 Oil Pump House  
9.117 Fourth Marine Wing Motor Pool  
9.118 Grease Rack  
9.120 Radioactive Test Area  
9.121 Dump Station  
Y-2 Vehicle Storage Area Between 12th and 13th St.  
Y-6 Aerial Photographs Areas 1 through 6
Y-7 Yermo Aerial Infrared Thermographic Survey TAs 16-19, 21, 22; TA 3 not investigated (outside of base boundaries)
10.1 General Warehouse  
10.6 Auto Hobby and Ceramic Shop  
10.7 Old Auto Hobby Shop  
10.9 Equipment Maintenance Shop  
10.10 Preservation and Packaging  
10.13 Auto Vehicle Shop Paint Booth  
10.14 Laundry  
10.15 Heating Plant  
10.17 General Warehouse, Air Filter Cleaning and Steam Rack  
10.18 Hazardous Material Storage Warehouse - Drain Pipe Area  
10.19 Steam Plant  
10.20 Maintenance Electric and Paint Shop  
10.21 Maintenance Shop, Metal Fabrication  
10.22 Landing Vehicle Tank (LVT) Test Tank (Fish Pond)  
10.23 Vehicle Maintenance/Lube Shop  
10.24 Automotive Preventive Maintenance and Wash Rack  
10.25 Auto Vehicle Maintenance Facility  
10.26 Heating Plant #1  
10.28 New Fire Department Training Facility  
10.29 Defense Reutilization and Marketing Office (DRMO) Storage Area  
10.31 Material Storage/Radioactive Training/Boneyard  
10.34 Boneyard  
10.36 New Domestic Wastewater Treatment Plant  
10.41 USTs T-1a,c  
10.43 USTs T-2b,-c1,-c2  
10.50 USTs T-43a,b  
10.61 UST T-196  
10.78 UST T-351  
10.79 UST T-353  
10.81 UST T-356  
10.82 UST T-357  
10.83 UST T-358  
10.84 UST T-359  
10.101 Former Armory  
10.102 Hazardous Materials Storage Area  
10.103 Dynamometer Building  
10.104 Post Exchange (PX) Gas Filling Station  
10.105 Cooling Tower  
10.106 Cooling Tower  
10.107 Cooling Tower  
10.108 Steam Converter Plant  
10.109 Armory  
10.110 Paint Shop  
10.111 Maintenance Storehouse  
10.112 Photograph Laboratory  
10.113 Boiler House Maintenance Area  
10.114 Grease House  
10.115 Maintenance Office, Grease Room  
10.116 Wash Rack, Motor Pool  
10.117 Steam Rack  
10.118 Tank Farm  
10.119 Grease Rack  
10.120 Old Skeet Range  
10.121 Drum Burial Area  
N-1 Past Vehicle Storage Area - Aerial Photo. Areas 1-5
N-2 Aerial Photograph/Oxidation Ponds/Old Rifle Range Areas 2-4; Area 1 included in Group 6
N-3 Nebo C55 TAs 2-14, 16, 20-22, 25, 25A, 30-34, and 36; other TAs included in Group 3
11.5 Alleged Landfill and Drum Area  

Notes:

RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
SWMU- Solid Waste Management Unit
AOC- Area of Concern
UST- underground storage tank
TA- thermal anomaly


Group 6 - RFA Sites To Be Investigated Further in the Extended RFA
SWMU/ AOC SWMU/AOC Name SWMU/AOC Sub-Area Description Historical Operations Related Investigations (Recommendations) Chemicals of Potential Concern
9.50/9.51 Domestic and Industrial Wastewater Collection Lines SWMUs 9.50 and 9.51 to be investigated as single site. Received domestic and industrial wastes from various sources; breaks in the lines have been identified RFAc (FAd based on release potential); Camera survey to identify leaks (Kennedy/Jenks 1993); repair design (Poggemeyer 1996) VOCse (potential groundwater impacts)
9.60 USTs T-530a,b UST T-530b; UST T-530a included in Group 1 Received used oil from Building 530 (DRMOg); wastes from all base operations may have been stored (including any waste oils or spent solvents used at Yermo Annex) RFA (FA based on soil sampling results); located in CAOCh 21 but not addressed in IRPi PCEj, SVOCsk, TRPHl
9.68 USTs T-588a,b UST T-588b (French drain); UST-588a included in Group 1 Received wastes from Building 588; operations included battery storage and repair, equipment lubrication, and steam cleaning RFA (FA based on lack of sampling data) French drain (various potential contaminants; not previously sampled)
Y-7 Yermo Aerial Infrared Thermographic Survey TA 12; other TAs included in Groups 3 and 5 No known historical operations RFA (FA based on geophysical anomalies/surface discoloration) Potential waste disposal
10.3 Warehouse 2, Old Repair Facility Investigation of SWMUs 10.32 and 10.43 to be included in investigation of SWMU 10.3. UST T-2b included in Group 1 Maintenance and repair operations including engine repair, rebuilding, and testing; radiator cleaning; metal parts cleaning; dynamometer testing; solvent cleaning of electrical parts; and weapons repair/parkerizing

 

RFA (FA based on potential releases from operations); CERCLAn OUo 2 (FA, groundwater). Potential VOC source area for Nebo North plume, various potential contaminants.
SWMU 10.32: HP-2 - Old Heating Plant Boiler operations, blowdown and cleaning materials (hydrazine, sodium carbonate, sodium tripolyphosphate, tetrasodium pyrophosphate) RFA (FA as part of SMWU 10.3) VOCs
SWMU 10.43: USTs T-2b,-c1,-c2 Received wastes from Building 2 operations RFA (FA as part of SWMU (10.3) T-2b, TRPH, chromium; T-2c2, TRPH, chromium, lead
USTs T 2F, 2F, 2G, 2H, 2I, and 2J (suspected USTs, no SWMU numbers) Potential USTs that may have stored various fuels and/or wastes used for Building 2 operations RFA (FA as part of SMWU 10.3) Various potential contaminants
10.4 Warehouse 3, General Warehouse and Steam Rack   Maintenance and repair operations including engine repair, rebuilding and testing; radiator cleaning; metal parts cleaning; dynamometer testing; solvent cleaning of electrical parts; and weapons repair/parkerizing RFA (FA based on visual survey and review of old drawings indicate potential for releases) VOCs, others, similar to Warehouse 2
10.5 Warehouse 4, General Warehouse   Maintenance and repair operations including engine repair, rebuilding, and testing; radiator cleaning; metal parts cleaning; dynamometer testing; solvent cleaning of electrical parts; and weapons repair/parkerizing RFA (FA based on visual survey and review of old drawings indicate potential for releases) Metals (Battery Shop)
10.12 Preservation and Packaging (Building 50)   Equipment cleaning (wash pad, solvent tanks), solvent still operation, sand blasting, painting RFA (FA based on soil and soil gas sampling results) PCE, hexavalent chromium, lead, zinc, TPH-d.
10.27 Old Fire Fighting Training Facility   Incineration of wood and trash ignited with various wastes, fire suppression with water RFA (FA based on soil sampling results) metals, TPH-d, chromium
10.35 Old Domestic Wastewater Treatment Plant   Treatment of domestic wastewater RFA (FA based on soil sample results) PCBs
10.37 Industrial Wastewater Treatment Plant   Treatment of industrial wastewater RFA (FA based on soil sample results); CERCLA OU 6, CAOC 4, Stratum 3 (FA as part of RFA) TPH-d, SVOCs, PCE, chromium
10.38
10.39
Domestic Wastewater Collection Lines
Industrial Wastewater Collection Lines
SWMUs 10.38 and 10.39 to be investigated as single site. Received domestic and industrial wastes from various sources; breaks in the lines have been identified RFA (FA based on release potential); Camera survey to identify leaks (Kennedy/Jenks 1993); repair design (Poggemeyer 1996) VOCs (potential groundwater impacts)
10.49 UST T-27a,b,c Three possible locations The uses of these USTs is unknown; operations at Building 27 include dynomometer testing and facility materials planning (storage) RFA (FA based on lack of soil sampling results) Not previously sampled
10.80 UST T-354   Received boiler blowdown material RFA (FA based on soil sampling results) Metals, chromium
N-2 (10.122) Aerial Photograph/Oxidation Ponds/Old Rifle Range Area 1; Areas 2-4 included in Group 5 AOC includes portions of the skeet and trap range and a portion of CAOC 7, Stratum 2 (Western Landfill Area) RFA (FA based on soil sampling results); CERCLA OU 6, CAOC 7, Stratum 2 (proposed cap over landfill area) PAHst, PCBs

Notes:

RFA- Resource Conservation and Recovery Act (RCRA) Facility Assessment
SWMU- Solid Waste Management Unit
AOC- Area of Concern
UST- underground storage tank
TA- thermal anomaly

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