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t <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http://www.atcassociates.corp <br /> 209.579.2221 <br /> (VATFax 209.579.2225 <br /> A S S O C I A T E S 1 N C ` <br /> September 21, 2005 <br /> 54.22493.0001 <br /> Mr. Jeff Wong <br /> San Joaquin County <br /> Environmental Health Department C <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan to Further Assess the Up-Gradient, Down-Gradient, and Cross-Gradient <br /> Extent of Petroleum Hydrocarbons at Eggiman, Andrew, and Edith Trust Property <br /> Located at 1112 East Harding Way, Stockton, California <br /> Dear Mr. Wong: <br /> ATC Associates Inc. has prepared this workplan, on behalf of Eggiman, Andrew, and Edith Trust <br /> for the performance of additional subsurface investigation activities at Eggiman, Andrew, and , <br /> Edith Trust property located at 1112 East Harding Way, Stockton, California (Figure 1). The <br /> purpose of the additional subsurface investigation is to further evaluate the vertical and <br /> horizontal extent of petroleum impacted soil and groundwater in the vicinity of the former <br /> underground storage tanks (USTs). This work is being done at the direction of San Joaquin <br /> County Environmental Health Department (EHD) in correspondence dated May 25, 2005. <br /> The scope of work includes obtaining permits, advancing three soil borings, potentially <br /> completing the borings as monitoring wells, collecting soil and groundwater samples, laboratory <br /> analysis of selected soil and groundwater samples, and preparing a summary report. The scope <br /> of work is described in detail in the following paragraphs.. <br /> BACKGROUND <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 of <br /> petroleum hydrocarbon constituents. The excavation was subsequently backfilled to the ground <br /> surface. <br /> On July 24, 1997, to investigate the extent of residual soil contamination at the site, a total of six <br /> soil borings were advanced to depths ranging from approximately 16 to 31 feet below ground <br /> surface (bgs). Detectable concentrations.,of total petroleum hydrocarbons as gasoline (TPHg), <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />