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---,, ATC Associates Inc. <br /> (: <br /> / 1117 Lone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> IV 209-579-2221 VAT C <br /> A A.S. S o CI ! A 7-E S 1 N c... fax: 209-579-2225 <br /> November 20,2006 <br /> 54.22493.0001 <br /> Ms.Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan to Evaluate the Lateral Extent of Petroleum Hydrocarbon-impacted <br /> Groundwater Associated with the Eggiman, Andrew, and Edith Trust Property <br /> Located at 1112 East Harding Way, Stockton,California <br /> Dear Ms. Duncan: <br /> ATC Associates Inc. (ATC) has prepared this workplan, on behalf of the Eggiman, Andrew; and <br /> Edith Trust to conduct subsurface investigation activities associated with the Eggiman, Andrew, <br /> and Edith Trust property located at 1112 East Harding'Way in Stockton, California (Figure 1). <br /> The purpose of the subsurface investigation is to evaluate the horizontal extent of petroleum- <br /> impacted groundwater in the vicinity of the subject site. This workplan was prepared in response <br /> to San Joaquin County Environmental Health Department (EHD) correspondence dated August <br /> 16, 2006. <br /> The scope of work includes obtaining permits, installing five off-site groundwater monitoring <br /> wells, collecting groundwater samples, laboratory analyses of groundwater samples, and <br /> preparing a summary report. The scope of work is described in detail in the following <br /> paragraphs. <br /> BACKGROUND INFORMATION <br /> In April 1987, SEMCO removed and disposed of two 1,000-gallon regular gasoline underground <br /> storage tanks (USTs), associated piping, and fuel dispenser from the,locations shown on Figure <br /> 2. A soil sample was collected from the end of each tank at approximately 17 feet below ground <br /> surface. Analytical testing indicated the collected samples contained detectable concentrations <br /> of petroleum hydrocarbon constituents. The excavation was subsequently backfilled to the <br /> ground surface. <br /> sA22493\reports\Wkp1n_wel1 inst2006.doc I <br />