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.
| 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) |
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) |
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) |
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) 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) |
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 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) |
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) |
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) |
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) 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 |
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) Pesticides/PCBs: Arochlor-1260 (248 ppm), furans (0.54 ppb), and dioxins (1.63 ppb). |
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) |
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) |
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) 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) |
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) |
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) 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) 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) 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) |
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) |
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) |
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) |
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) 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) |
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) Metals: Cadmium (230 ppm) and lead (839 ppm). |
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) |
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) |
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) |
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) 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
| 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
| 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
| 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
| 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
| 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
| 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
