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C t 9 <br /> E <br /> T i- <br /> CONDOR EARTH TECHNOLOGIES INC. Wy i1;21 <br /> 1125 No. 21663 Brian Lane <br /> Suite H KO MMM P.O. Box 3905 <br /> P.O. Box 34489%WMEMB Sonora, CA 95370 <br /> May 11, 1995 Turlock, CA 95381 (209)532-0361 <br /> (209)668-9234 FAX(209)532-0773 <br /> FAX(209)668.9248 <br /> Mr. Steve Sasson <br /> San Joaquin County Public Health Services <br /> Environmental Health Department <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> RE: Di Salvo Trucking Facility located at 144 . Lathrop Road in Lathrop, California <br /> Dear Mr. Sasson; <br /> This letter is to confirm our telephone conversation n May 4, 1995, in which we discussed the next <br /> phase of investigation for site characterization at the above referenced site. The following history of the Di <br /> Salvo - Lathrop site is provided for your convenience. <br /> SUMMARY - SITE HISTORY <br /> On August 11, 1993, seven underground storage tanks (USTs) were removed from the site._ The site <br /> location is shown in Figure 1, attached. The contents of the tanks were diesel, motor oil, and waste oil. <br /> Laboratory analyses of the soil sample collected from beneath the east end of the former location of one <br /> 10,000-gallon diesel UST (TK4) at approximately 13.5 feet below the ground surface (bgs) detected. 80 mg/kg <br /> diesel and 350 mg/kg motor oil. During removal of the USs, grey petroleum staining was noted to a depth <br /> of approximately 8 feet on the east excavation sidewall of the excavation, adjacent to the fill ends of TK3, <br /> TK4, and TK5. The former UST locations are shown in the Figure 2, attached. No evidence of hydrocarbon <br /> contamination was detected at or above the reported laboratory detection limits in any of the remaining soil <br /> samples collected from beneath the former USTs located at t e site. Based upon the results of laboratory <br /> analyses of the soil samples collected from the site, Condor -ecommended over-excavation of soil at the east . <br /> end of the former location of TK4. <br /> ENVIRONMENTAL • GEOLOGICAL ENGINEERING GEOTECHNICAL <br />