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Corrective Action Remedy Selection,General Dynamics OTS(California Inc.) <br /> r_ Statement of Basis,March 2001 <br /> - Page 2 of 5 <br /> 2. Solid Waste Management Unit (SWMU)#21, Oil Spill Area. Soil was found to <br /> be impacted by petroleum hydrocarbons (diesel)and Oil and Grease at <br /> concentrations up to 7,100 ppm and 2,300 ppm respectively. Estimated quantity <br /> of impacted soil to be excavated is 57 cubic yards. <br /> All other constituents of concern were found to be below Preliminary Remedial Goals <br /> (PRG) screening levels for residential use. Soil samples were tested from five areas <br /> identified in the RFA. Testing parameters (test method numbers from SW-846) <br /> included PCBs (8082), metals (6010), Total Petroleum Hydrocarbons as diesel (TPHd) <br /> and Total Petroleum Hydrocarbons as gasoline (TPHg) (8015m), volatile organics <br /> (8020), and Oil and Grease (1664). <br /> Facility History and Corrective Action <br /> The General Dynamics facility is located approximately 50 miles east of San Francisco <br /> and six miles southwest of downtown Tracy in a section of the Altamont Hills known as <br /> Elk Ravine. The facility occupies approximately 500 acres and is engaged in research <br /> and development of explosive devices. Surrounding land usage includes cattle grazing <br /> land to the north and east and the Lawrence Livermore National Laboratories Site 300 <br /> to the west and south. The Lawrence Livermore's Site 300 is also engaged in <br /> explosive testing. <br /> Since 1965, the facility has been used for research and development of explosive <br /> devices. Prior to that time, the site was undeveloped agricultural land. Site operations <br /> are currently undergoing closure and no further explosive testing is anticipated at the <br /> site. <br /> Operations at the site have utilized a number of materials and chemicals which have <br /> generated hazardous and non-hazardous wastes. The materials of concern included <br /> petroleum hydrocarbons (including diesel fuel, used motor oil, mineral oil), beryllium, <br /> lead, chromium, organic solvents, and Polychlorinated Biphenyls (PCBs). Soils tested <br /> for these constituents resulted in one constituent, petroleum hydrocarbons, present at <br /> levels above approved cleanup levels. <br /> A RCRA Facility Assessment (RFA)was prepared for the site in March, 1993. The RFA <br /> involved review of all past records and management practices and a site visit to identify <br /> all areas where hazardous materials and waste could have been released. A total of 26 <br /> areas of concern were identified in the RFA. <br /> Past operations at the site also included a number of hazardous waste storage and <br /> treatment units. These units have already been closed under the supervision of DTSC. <br /> Units for which closure has been approved include an open burning pit, solid waste <br /> burial trench, surface impoundment for photo wash water, and wash water discharge <br /> units. Closure for these units was approved by DTSC on December 16, 1994. A <br />