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s y only. No domestic use is allowed, information on the depth of the well and perforated intervals is meager, but a notation 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 k, records tindicate locationwhether the perforaations. The ll was plugged back, or the type 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 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 PRIOP. TO THIS REPORT: in January, 1987, a tank removal & closure pian was submitted to the San Joaquin Co. Public Health District for 3 underground stor-agel anks : a 12,000 gallon diesel , a 5,000 gasoline, and Ja 50018,allon the oil; refer to Exhibit A for details. n gasoline & diesel tank were removed amender 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. The soil was placed in properly cleaned brass tubes by Canonie Environmental personal, 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 tan=s was approximately 45' X 42' X 16' deep. The removed tanks were tranported to Triangle Inc. of Sacramento for disposal: (Exhibits B & C. ) on June 24, 1988, the 500 gallon waste oil tank was removed by company equipment, under the supervision of Harlen Knoll of the County Environmental Health Division. Two soil samples were m the north and taken; one from the bottom and one caroreenby ed takta Eanonie east walls at a depth of 5Sa ' esserl aced brass tubes, Environusing technician, g ProP y prepared P which were sealed, labeled, placed on Ice? and transportedpre under chain of custody to the laboratory. to make a composite sample from both tubes, and analyzeshows for BTX , TEPEE, PCB, and chloronated solvents. of those tests, which revealed that all tested substances were -- -below-detection_--li;ai_�s, _except for TEPH,-which was 2940 mg/kg. 7