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ATC Associates Inc. <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto,California1 <br /> 209-579-222-2221 <br /> (MkFax:209-579-2225 <br /> AS SOCI ATIES 1 H C. <br /> December 2, 2010 RECEIVED 54.62577.0001 <br /> DEC 0 8 2010 <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Division ENVIRONMENTALHEAL " <br /> 304 E. Weber Street, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> RE: Soil Gas Survey Workplan <br /> Diesel Performance Inc. <br /> 2804 East Fremont Street, <br /> Stockton, California, <br /> LOP Site Code: 1120 <br /> Dear Ms. Duncan: <br /> ATC Associates Inc. (ATC) has prepared this workplan, on behalf of Diesel Performance Inc. to <br /> conduct a soil vapor survey at the above referenced site located at 2804 East Fremont Street in <br /> Stockton, California (Figure 1). The purpose of the soil gas study is to evaluate the potential for <br /> vapor intrusion hazards from petroleum hydrocarbon impacted soil and/or groundwater beneath <br /> the site with respect to nearby structures. This work was directed by the San Joaquin County <br /> Environmental Health Department (SJCEHD) through email correspondence dated November <br /> 4, 2010. <br /> The scope of work includes advancing four soil borings, completing these borings as temporary <br /> soil gas sampling points; chemical analyses of soil gas samples; comparing soil gas analytical <br /> results to the California Human Health Screening Levels (CHHSLs) as provided by the <br /> California Environmental Protection Agency (CAL EPA) and the Environmental Screening <br /> Levels (ESLs) as provided by the California Regional Water Quality Control Board (RWQCB) <br /> San Francisco Bay Region; and preparing a summary report detailing site activities. The scope <br /> of work is described in detail in the following paragraphs. <br /> BACKGROUND <br /> In February 1987, SEMCO removed and disposed of one 3,000-gallon underground storage <br /> tank (UST), associated piping, and fuel dispenser used to store and dispense unleaded <br /> gasoline, at the location shown on Figure 3. A soil sample collected from 13 feet below ground <br /> surface (bgs) contained elevated concentrations of petroleum hydrocarbon contaminants. The <br /> excavation was subsequently backfilled and resurfaced. <br /> On July 23, 1997, an ATC geologist supervised the advancement of five direct-push soil borings <br /> (SB1 through S135) ranging in depth from 6 to 46 feet bgs. Petroleum hydrocarbons were <br />