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' ATC Associates Inc <br /> 1117 Lone Palm Avenue, Suite B <br /> (: <br /> Modesto, California 95351 v9%TC <br /> 209-579-2221 <br /> A S S 0 C I A ? E S I N C <br /> fax 209-579-2225 <br /> Remedial Activities Summary Report <br /> Diesel Performance <br /> ' 2804 East Fremont Street <br /> Stockton, California <br /> ATC Project No 54 62577 0001 <br /> 1.0 INTRODUCTION <br /> ' ATC Associates Inc hasre ared tins Remediation SummarY Report ort on behalf Diesel <br /> p P <br /> Performance for high vacuum dual phase extraction and remediation at the above referenced site <br /> The purpose of the high vacuum dual phase extraction is an effort to remediate the hydrocarbon- <br /> impacted vadose and capillary fringe zone soils This work was performed at the direction of San <br /> ' Joaquin County Environmental Health Department (EHD) in correspondence dated March 17 and <br /> September 29, 2004 <br /> 2.0 SITE DESCRIPTION <br /> The site is located on the south side of East Fremont Street in the City of Stockton, California, as <br /> shown on Figure 1 The location is a commerciaVindustnal and residential area The site is <br /> currently occupied by Diesel Performance <br /> ' 221 ReWonal Geology and H droeol <br /> The site is located within the Great Central Valley geomorphic province Ground water in the <br /> Stockton area is present in Recent alluvium Ground water enters the Great Central Valley via <br /> surface and subsurface flow and by direct percolation of precipitation, stream flow, and applied <br /> water Replenishment of the groundwater occurs by percolation of precipitation, stream flow, and <br /> ' applied water occurs in the forebay areas where permeable sediments are exposed at ground <br /> surface <br /> ' According to the United States Geological Survey (USGS) 7 5-Minute Senes Topographic Map <br /> of the Stockton West, California Quadrangle, the site is located at an approximate elevation of 24 <br /> feet above mean sea level The regional surface topographic gradient in the vicinity of the site is <br /> ' towards the west The ground water flow direction beneath the site is generally towards the south <br /> and the gradient has historically been very flat Since 1998, depth to groundwater beneath the site <br /> ' has varied from approximately 45 to 55 feet bgs Historical ground water data are included in <br /> Table 3 <br /> s lenvi omental162577—Diesel Perflreportslmtenm_rem doc 1 <br /> 1 <br />