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S 1 <br /> •r f ! L_1 � I'f <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209) 838-9888 <br /> Fwsunde. (209)838-9883 <br /> August 24, 1998 <br /> Ms Lon 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 Workplan for Subsurface Investigation <br /> 640 N El Dorado Street, Stockton, California <br /> Site Code 1090 <br /> Dear Ms Duncan <br /> This letter report is submitted to present a proposed workplan to conduct a subsurface investigation <br /> at the subject site (Figure 1) In correspondence dated June 2, 1998, San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD) requested a workplan be submitted by <br /> July 24, 1998 Ground Zero Analysis, Inc (Ground Zero) was granted a 30-day extension on behalf ' <br /> of the responsible party by Ms Lon Duncan of PHS/EHD <br /> The general scope of work will consist of drilling and sampling four soil bongs in the vicinity of the <br /> former underground storage tanks (UST) to investigate the vertical and lateral extent of residual soil <br /> contamination, collecting a discrete groundwater sample from one boring to determine if <br /> groundwater has been impacted, and preparing a technical report that summarizes the methods and <br /> results of the investigation <br /> BACKGROUND <br /> The site previously operated as an automotive sales and service center and utilized one 250-gallon <br /> UST for storage of waste oil The UST was removed under permit from PHS/EHD on March 26, <br /> 1997 A soil sample collected from beneath the tank contained elevated levels of petroleum <br /> hydrocarbons, lead, and chlorinated solvents Analytical results are summarized in Table 1 <br /> Groundwater beneath the site is expected to be encountered at approximately 25 to 30 feet below <br /> ground surface (bgs), based on historical information available from the San Joaquin County Flood <br /> Control and Water Conservation District <br /> pbbard40898 doc <br />