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• SIERRA <br /> // 11 <br /> October 30, 1991 En1ErollnleRlal Services <br /> Clint Rogers <br /> Chevron USA <br /> P O Box 5004 <br /> San Ramon, CA 94583 <br /> Re Chevron Service Station #9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SES Project #1-146-01 <br /> Dear Mr Rogers <br /> As required by the San Joaquin Local Health District,Sierra Environmental Services(SES) <br /> presents the following work plan for installation of one monitoring well at the above-referenced <br /> Chevron service station (Figure 1, Appendix A) <br /> SUAM ARY <br /> SES will install one additional morutoring well at the site to evaluate the presence or <br /> absence of hydrocarbons directly downgradrent of the former tank area <br /> INTRODUCTION <br /> Site History and Current Site Use <br /> The following information was compiled from the GTI report prepared for this semee <br /> station February 27, 1987 ' The underground storage tanks were removed from the northeast <br /> corner of the station in December 1986 The underground storage tanks were relocated to the <br /> western portion of the property, behind the service station building <br /> In January 1987, one monitoring well, MW-1, was installed in the former underground <br /> storage tanks area (Figure 2, Appendix A) Two soil samples from the boring were analyzed for <br /> 40 total purgeable petroleum hydrocarbons as gasoline [TPPH(G)] and benzene, toluene and xylenes <br /> ' Groundwater Technology, February 27, 1987 Report of Subsurface investigation, Chevron Service Station#9- <br /> 6171, Stockton, California, Consultants report prepared for Chevron 8 pages <br /> P.O. Box 2546 Martinez, California 94553 (510) 370 - 1280 <br />