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X'k / <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton,California 95201 t!`oaa <br /> (209) 468-3400 <br /> December 27, 1990 <br /> Stan Roller <br /> Shell Oil Company <br /> 1390 Willow Pass Road, Ste. 900 <br /> Concord, CA 94520 <br /> RE: Shell Food Mart IN REPLY REFER TO SITE CODE: 1084 <br /> 2320 N. E1 Dorado <br /> Stockton, CA 95204 <br /> On July 10, 1990, three (3) underground fuel storage tanks were <br /> removed from the above referenced location. Hydrocarbon <br /> contamination was detected in the excavation and under the <br /> associated piping. On July 31, 1990, the underground storage tank <br /> excavation and piping trenches were over-excavated to remove <br /> residual hydrocarbon contamination. <br /> The analytical results of the soil samples taken in the old and the <br /> new tank excavations were non-detectable for hydrocarbon <br /> contamination. However, soil samples taken in the piping trenches <br /> did exhibit residual contamination. (SL-2 0. 41 parts per million <br /> (ppm) toluene and 3 .8 ppm xylenes. ) <br /> On November 5, 1990, your consultant, Aegis Environmental, Inc. , <br /> requested site certification due to the low levels of contamination <br /> and low permeability of soils on site. San Joaquin County, Public <br /> Health Services, Environmental Health Division, cannot certify this <br /> site at this time. The residual levels of toluene and xylene <br /> exceed the maximum allowable levels to be left in place under the <br /> LUFT Guidance Document's leaching potential analysis. <br /> Further soil analysis in the vicinity of east pump island and SL-2 <br /> is necessary to determine the extent of hydrocarbon contamination. <br /> Upon completion of additional soil sampling and analysis, this site <br /> may be reevaluated for site certification. <br /> Please submit a Work Plan to define the extent of soil <br /> contamination by February 11, 1991. <br /> A Division of San Joaquin County Health Care Services <br />