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83 WEST MARCH LANE SUITE 12 `•yG �, STOCKTON,CA 95207 sM PHONE:(209)476-1635 MANAGERS DESIGNE85WMLTANTS January 30, 1991 Ms. Kasey Foley San Joaquin County Public Health Services Environmental Health Division (EHD) P.O. Box 2009 Stockton, CA 95201 W.O. 5961-03-01 RE: Underground Storage Tank Site Closure San Joaquin Delta College Dear Ms. Foley, On behalf of San Joaquin Delta College (SJDC) , this letter is to advise you that two underground storage tank sites on the SJDC campus have been restored to their pre-tank condition and the tank removal project at these two sites is considered complete. In September 1990, tanks and piping were removed and the underlying was soil sampled on the two sites under the supervision of ROY F. WESTON, INC. (WESTON) . M.H. Loe of Ventura, California was the excavation subcontractor and Twinning Laboratories of Fresno, California collected and analyzed the soil samples. The three tanks removed consisted of a 500 gallon waste oil tank buried near the diesel repair shop, a 500 gallon solvent tank and a 500 gallon split paint/lacquer thinner tank, both buried near the "Archies Bunker" in the paint shop area of the Delta College campus. The tank and piping layouts, as well as the soil sample locations, are presented in Figure 1. A summary of analytical results is presented in Table 1. As all soil sample analytical results were below regulatory action levels, permission was granted by the EHD to backfill and restore the two sites (personal communication with Kasey Foley of the EHD, December 11, 1990) . Site restoration was completed January 26, 1991. San Joaquin Delta college requests acknowledgement by the EHD that the subject tanks and piping were removed and that the soil beneath the tanks and piping was found to be clean.