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1117 Lone Palm Avenue, Suite 8 <br /> : + Modesto, California 95351 <br /> vwww.atc-env'xo.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> 41 A S S O C I A T E S I N C " <br /> II Q <br /> August 14, 2001 <br /> 54.62577.0001 <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health cn <br /> Services, Environmental Health Division <br /> f 304 E. Weber Street, Third Floor <br /> l Stockton, California 95202 <br /> Subject: Workplan for Soil Vapor Extraction and Additional Investigation at Diesel <br /> f Performance, 2804 E. Fremont Street, Stockton, California <br /> Dear Ms, Duncan: <br /> ATC Associates Inc. has prepared this workplan, on behalf Diesel Performance Inc., for soil <br /> vapor extraction pilot testing and additional investigation at the above referenced site. The <br /> I purpose of the pilot test is to evaluate if soil vapor extraction is a viable remedial option for <br /> remediating petroleum impacted soil in the vicinity of the former underground storage tanks <br /> (USTs) and to further define the lateral and vertical extent of impacted soil and groundwater. <br /> This work being done at the direction of San Joaquin County Public Health Services <br /> Environmental Health Division (PHSIEHD) in correspondence dated May 15, 2001. <br /> The scope of work includes obtaining permits, advancing one cone penetrometer boring, <br /> advancing five hollow stem auger soil borings, completing three of the borings as vapor extraction <br /> wells and two of the borings as monitoring wells, collecting and analyzing soil and groundwater <br /> samples, performing a vapor extraction test, and preparing a summary report. The scope of work <br /> is described in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located on the south side of Fremont Street and east of Filbert Street in Stockton, <br /> California, as shown on Figure 1. The location is a commercial area and the site is currently <br /> occupied by Diesel Performance. <br /> BACKGROUND <br /> In'February 1987, SEMCO removed and disposed of one 3,000-gallon unleaded gasoline UST, <br /> associated piping, and fuel dispenser from the location shown on Figure 2. A soil sample <br /> collected at 13 feet below ground surface (bgs) contained elevated concentrations of petroleum <br /> hydrocarbon contaminants. The excavation was subsequently backfilled and resurfaced. <br /> w;1625771reportslwkpinvaporExts.dm 1 <br />