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ATC Associates Inc. <br /> 1117 Lone Palm Avenue,Suite 201 <br /> L' Modesto,California 95351 <br /> 209-579-2221 <br /> fax:209-579-2225 <br /> A S.S O.0 4 A'T E-S 1N,C <br /> April 6, 2011 RECEIVED <br /> 54.62577.0001 <br /> APR X011 <br /> Ms. Lori Duncan <br /> San Joaquin County ENVIRONMENTAL HEALTH <br /> Environmental Health Division <br /> PERMIT/SERVICES <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> RE: Soil Gas Survey <br /> Diesel Performance Inc. <br /> 2804 East Fremont Street, <br /> Stockton, California, <br /> LOP Site Code: 1120 <br /> i <br /> Dear Ms. Duncan: <br /> ATC Associates Inc. (ATC) has prepared this report, on behalf of Diesel Performance Inc. to <br /> summarize soil vapor sampling activities conducted at the above referenced site (Figure 1). <br /> The purpose of the soil gas study was to evaluate the potential for vapor intrusion hazards from <br /> petroleum hydrocarbon impacted soil and/or groundwater beneath the site with respect to the <br /> Diesel Performance facility and other nearby structures. This work was directed by the San <br /> j Joaquin County Environmental Health Department (SJCEHD) through email correspondence <br /> dated November 4, 2010. <br /> SITE LOCATION <br /> The site is located at located at 2804 East Fremont Street in Stockton, California, as shown on <br /> Figure 1 and Figure 2. Principal land use in the vicinity of the-site consists of commercial and <br /> residential properties. <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 /> i 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 SB5) ranging in depth from 6 to 46 feet bgs. Petroleum hydrocarbons were <br /> detected in soil samples submitted for laboratory analyses from SB3. Site activities are <br /> summarized in ATC's Summary Report for Subsurface Investigation, dated October 20, 1997. <br /> From September 25 to 28, 1998, ATC personnel supervised the advancement of soil boring to a <br /> depth of approximately 65 feet bgs. This boring was completed as groundwater monitoring well <br /> � S:\Environmental\62577\Reports\2011 Soil Gas.doc 1 ATC Associates Inc. <br /> i <br />