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P <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street <br /> Escalon,California 95320-1927 JAMS <br /> Telephone:(209)838-9888 <br /> Facsimile:(209)838-9883 NT HEALTH PFArconnim", <br /> 4 <br /> JT�'SERVJGES <br /> January 12, 2005 <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Soil Excavation Report <br /> John Ray Company, 2249 E. Waterloo Road, Stockton, California <br /> Dear Mr. Knoll: <br /> This letter report is submitted on behalf of John Ray Company to summarize the results of the soil <br /> excavation activities conducted December 28, 2004 at the 'bve referenced site. The excavation <br /> was performed to remove hydrocarbon impacted soil in accordance with the workplan prepared by <br /> Jim Thorpe Oil, Inc. The site location is shown on Figure 1. <br /> BACKGROUND INFORMATION <br /> Initial Investigation and Underground Storage Tank Removal <br /> On or near August 15, 2004, employees moving pallets di§covered a pipe in a dirt lot in the <br /> southwest portion of the property. Jim Thorpe Oil was contracted by the property owner to <br /> investigate the nature of the unknown pipe uncovered a previously unknown underground storage <br /> 6 <br /> tank (UST). The UST was removed under permit on Septemb er 16, 2004. A soil sample <br /> collected beneath the UST contained toluene, ethylbenzene.it total 'Xylenes, and lead. Analytical <br /> results are summarized in Table 1. <br /> Hydrogcological Setting <br /> The site is located in southwestern Stockton approximately 1.5 miles south of the Calaveras <br /> River. The nearest body of surface water is the Stockton Diverting`Canal, located approximately <br /> 0.9 mile northeast of the site. Surface elevation at the site-is approximately 20 feet above sea <br /> pr <br /> level. <br /> Based on historical information provided by San Joaquin County Flood Control and Water <br /> Conservation District, groundwater beneath the site is expe'cted to be encountered at <br /> (;AGR0UNDZRJohnRay\exsum.doc <br />