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4.0 Discussion R& L closed an underground used oil tank in place on 4112188 by filling with concrete. The closure was approved and witnessed by the San Joaquin Local Health District (SJLHD). Soil samples were not taken at this time, as tank testing showed the tank to be free of leaks. R& L requested a closure letter from the SJLHD on 2/29/89. The SJLHD did not respond. Current requests to the San Joaquin Environmental Health District (SJEHD), and the State Water Resources Control Board, failed to secure a closure letter pending demonstration through soil sampling,that the tank did not leak. This work is being undertaken to secure the required soil samples. In addition, R&L plans to use the manual soil sampling equipment to determine whether or not two additional underground tanks exist on site, and, if so, to secure soil samples adjacent to these tanks to determine whether or not they leaked. R& L never used these tanks, but is undertaking this investigation to ensure that the site is completely free of USTs. 5.0 Procedure The used oil tank under the concrete slab in the Transmission Shop is reported to be a 500 gallon, vertical tank. Thus, the tank dimensions will be approximately 4 ft. diameter by 5 ft. high. Two 12 in, holes will be cored in the concrete slab floor over opposite sides of the underground tank as shown in the sketch in Figure 5. Using the manual sampler, one hole will be advanced to contact the top of the tank and thus establish the depth of cover. The sampler will then be moved outward and advanced to a point past the top of the tank. The sampler will then be moved to the opposite side of the tank, and advanced similarly past the top of the tank. If the tank is encountered in either of these probings, the sampler will be moved accordingly and the manual drilling repeated, until two bore holes are advanced on either side of the tank to a point 12 inches below the bottom of the 3 s