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VY <br /> ATC Associates Inc. <br /> ( fC <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California 95351 A <br /> 209-579-2221 <br /> A S s O c I a T E s ! N C. Fax.209-579-2225 <br /> July 8, 2011 <br /> 54.62577.0001 <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Division <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: Workplan for Destruction of Groundwater Monitoring and Vapor Extraction Wells <br /> at Diesel Performance inc. 2804 East Fremont Street, Stockton, California, LOP Site <br /> Code: 1120 <br /> Dear Ms. Duncan: <br /> ATC Associates Inc. has prepared this workplan for well destruction, on behalf of Diesel <br /> Performance Inc., for the above referenced site. <br /> The scope of work in brief includes obtaining permits, pressure grouting the groundwater <br /> monitoring and remediation wells, and preparing a summary report. The scope of work is <br /> described in detail in the following paragraphs. <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. <br /> SITE HISTORY <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 SB5) ranging in depth from 6 to 46 feet bgs. Petroleum hydrocarbons were <br /> detected in soil samples submitted for laboratory analyses from S133. 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:Tnvironmenta11178611reportsl4ymr2005.doc 1 <br />