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company vehicles, and the storage of waste oil from prime movers and other equipment. Because detailed inventory reconciliations have not been kept, it is not possible to estimate the amount of spillage that might have occurred over the years the tanks were in service. REVIEW OF WORK PERFORMED PRIOR TQ TH_La_f7EP(3RT:) In January, 1987, a tank removal w closure plan was submitted to the San Joaquin Co. ' Public Health District for 3 underground storage tanks; a 12,000 gallon diesel , a 5,000 gasoline, and a 500 gallon waste oil . On June 1.8, 19B7, the gasoline & diesel tanks were removed under the supervison of Mr. Harlen Knoll of the County Environmental. Health Division, using company equipment & personel . A soil sample was taken from beneath each removed tank using the , backhoe bucket. Test results revealed detectable amounts of RTX, total lead, and TVPH. Approximately 1120 cubic yards of spoil was removed, which was placed on plastic to the north of the excavation, and covered with plastic. The dimensions of the excavation after removal of both tanks was approximately 45 ' X 42 ' X 16 ' deep. The removed tanks were transported to Triangle Inc. of Sacramento for disposal. . On June 24, 1988, the 500 gallon waste coil tank was removed by company equipment, under the supervision of HArien Knoll of the County Environmental Health Division. Two soil samples were taken; one from the bottom and one composited from the north and east walls at a depth of 5-6' . Instructions were given to make a composite sample from both tubes, and analyze for BTEX, TEPH, PCH, and chloronated solvents. The results revealed that all tested substances were below detection limits, except for TEPH, which was 2900 mg/kg. Approximately 100 .cubic yards of spoil was removed, placed on plastic an site, and properly covered. The resulting excavation measured about 16' X 19 ' X 9 ' deep. Plates VII & VIII show plan & section views of the two excavations, and their relative positions to other structures on the property. No further activity took place until September 12, 1989, when Canonie Environmental collected three samples from the excavation which -had contained the gasoline & diesel tanks; one from the east & west walls, and one from the bottom. Samples were ' analyzed for BTEX (8020, ) and TEH (8015. ) The results revealed that BTEX was below detection levels in all samples, and that TEH was detectable only in the west and bottom samples. On March 350, 1989, a workplan was prepared by Caude C. Wood Co. , and submitted to the County Environmental Health Division. It proposed to remove an additional 5 feet of spoil from the sides and bottom of the two excavations, and resample as required. A