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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> December 14, 2000 <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Soil Excavation Report and Case Closure Request <br /> North Stockton Auto Service, 8709 N. Davis Road, Stockton, CA <br /> Dear Ms. Duncan: <br /> Enclosed please find your copy of the subject report. The report describes the recent excavation of <br /> • contaminated soil and the results of soil sampling. All confirmation soil samples were non-detect, <br /> including the sample collected from the floor of the excavation at a depth of twenty feet. <br /> We previously proposed to install a soil boring through the former tankpit in order to collect a <br /> groundwater sample. We are currently recommending that we forego this boring and hope your <br /> agency will reconsider the need for a groundwater sample. No evidence suggests that contamination <br /> may have migrated to groundwater. However, the immediate proximity of an upgradient MTBE <br /> groundwater contamination site (Tosco/Circle K Unit No. 08671) raises the possibility that onsite <br /> groundwater could be affected by that release. Should an onsite groundwater sample be found to <br /> contain MTBE or other gasoline compounds, our client would in all likelihood be required to <br /> investigate the problem on the assumption that it originated on site. <br /> Our client wishes to avoid the immediate expense of drilling and sampling a boring to <br /> groundwater and the potential expense of investigating an offsite release. We will, however, <br /> install the boring if you disagree with our current recommendation. Please feel free to contact me <br /> at any time. <br /> Respectfully, <br /> Gr ou ero Analysis C. <br /> Gregory P. Stahl, RG 5023 <br /> . CA Certified Hydrogeologist No. 264 <br /> Enclosure <br /> Nsauto/rcporWexcaysum.doc <br />