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• only. No domestic use is allowed. Information on the depth of the well and perforated intervals is meager , but a natation on a hand written sheet shows that there was 204 feet of 16"-10 gauge casing, and that the well appears to have bottomed at 540 feet. There are no records to indicate whether or not the well was plugged back, or the type and location of the perforations. The pump intake appears to be at about 120 feet. PRIOR TANK USAGE & ESTIMATES OF SPILLAGE. The tanks were instal- led in the early 1960 's to provide fuel for plant operations and company vehicles, and the storage of waste oil from prime movers and ether equipment. Because detailed inventory reconciliations have not been kept, it is not passible to estimate the amount of spillage that might have occurred over the years the tanks were in service. REVIEW OF WORK PERFORMED PRIOR TO THIS REPORT: In January, 1987+ a tank removal & 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 ; refer to Exhibit A for details. On June 18, 1987, the gasoline & diesel tank: were removed under the supervison of Mr. . Harlen Knoll of the County Environmental Health Division, using company equipment & personel . A sail sample was taken from beneath each removed tank using the backhoe bucket. The soil was placed in properly cleaned brass tubes by Canonie Environmental personel , sealed, labeled, placed on ice and transported under proper chain of custody to the laboratory for analysis. Tests required by the County were; BTX&E, total lead, and TVPH. Table I shows the results of those tests. 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 , (Exhibits B & C. ) On June 24, 1968, the 500 gallon waste oil tank was removed by company equipment, under the supervision of Harlon 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 ' . Samples were taken by a Canonie Environmental technician, using properly prepared brass tubes, which were sealed, labeled, placed on ice, and transported under chain of custody to the laboratory. Instructions were given to make a composite sample from both tubes, and analyze for BTX, TEPH, PCH, and chloronated solvents. Table II shows the results of those tests, which revealed that all tested substances were below detection limits, except for TEPH, which was 2900 mg/kg. 3 I