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]E15 GROUNDWATER <br /> 0:11:11:1 TECHNOLOGY, INC. <br /> OIL RECOVERY SYSTEMS 4080 Pike Lane, Suite D, Concord, CA 945201227(415)671-2387 <br /> December 1, 1986 <br /> Mr. Mark Nelson <br /> Chevron USA, Inc. <br /> 2 Annabel Lane, Suite 200 <br /> San Ramon, CA 94583 <br /> Re: Service Station #9-4054 <br /> Dear Mark: <br /> Submitted herewith is Groundwater Technology's report titled <br /> 'Subsurface Assessment Report for the Chevron service station # <br /> 9-4054, 2103 Country Club Boulevard, Stockton, California'. The <br /> report presents the findings of sampling and analysis of soils <br /> and monitoring of three groundwater wells installed at the site. <br /> The investigation indicated that gasoline type hydrocarbons <br /> are present,0'in the soils at monitoring wells 1 and 2 and <br /> apparent diesel type hydrocarbons in the soils at monitor well 3. <br /> Hydrocarbon concentrations recorded by laboratory analysis <br /> in soil samples obtained at the groundwater level in monitoring <br /> wells 1, 2 and 3 were 4.1, 3.3 and 1.5 parts per million (ppm) <br /> respectively. Although the laboratory results indicate rela- <br /> tively low levels of hydrocarbons are present at the site, strong <br /> hydrocarbon odors and visible product were noted by the project <br /> geologist during drilling. Furthermore, measurable free product <br /> was observed in monitoring well 1 subsequent to drilling although <br /> further monitoring did not record the presence of free floating <br /> product. <br /> According to the San Joaquin Local Health District, ground- <br /> water contamination resulting from a confirmed leak exists in the <br /> immediate vicinity of the site and underground fuel storage tanks <br /> located on property to the east of site failed precision tank <br /> tests. Whether the contamination present at the Chevron site is <br /> the result of an on-site leak or due to migration of contaminants <br /> from an off-site source can not be determined from the presently <br /> available date. However, because hydrocarbon odors were noted in <br /> the near surface soils, it is likely that the contamination is, <br /> at least in part, the result of an on-site loss of fuel. <br /> Other offs:Redondo Beach,CA:Tampa,FL:Mandeville,LA:Norwood,MA:Novi,Ml. <br /> ABnneapohr,MR,tieenville,NH:Chadds Ford,PA:Montreal,Quebec,Canada <br />