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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 <br /> 8709 N. Davis Road, Stockton, California <br /> Dear Ms. Duncan: <br /> . This letter report is submitted on behalf of North Stockton Auto Service to summarize the results of <br /> source removal excavation conducted November 8, 2000 at the subject site. The excavation was <br /> performed to remove hydrocarbon impacted soil in accordance with the October 2, 2000 Workplan for <br /> Interim Remediation approved by San Joaquin County PHS/EHD in a letter dated October 12, 2000. <br /> BACKGROUND INFORMATION <br /> Initial Investigation and Underground Storage Tank Removal <br /> The site currently is an automotive service center and is owned by Mr. Ed Niemann, et.al. The <br /> location of the property is shown on Figure 1. One 550-gallon UST was previously utilized for <br /> storage of waste oil. The UST was removed under permit from PHS/EHD on May 26, 2000. A <br /> soil sample collected from beneath the tank contained elevated levels of petroleum and chlorinated <br /> hydrocarbons. Analytical results are summarized in Table 1. The location of the former UST is <br /> depicted on Figure 2. <br /> Soil Boring Investigation <br /> On September 11, 2000, a total of five soil borings were advanced at the site to investigate the <br /> lateral and vertical extent of residual soil contamination, as well as the potential impact to <br /> groundwater. Boring SBI was located in the former UST excavation, and borings SB2 through <br /> . SB5 were located around the perimeter of the UST excavation (Figure 2). The borings were <br /> advanced to depths ranging from 16.5 to 17 feet bgs where drilling refusal was met due to a hard <br /> pan formation. Analytical results of soil samples collected from the borings indicated soil <br /> contamination was present at shallow depths within the former tank pit location. Analytes of <br /> Nsauto/repoRs/excaysum.doc <br />