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1 <br /> 1117 Lone Palm AvE <br /> Suii', <br /> j r i.+, Modesto. CA 953`._. . <br /> 209.579.2221 <br /> oikircfr x Fax 209.579.2225 <br /> A S S O C I A T E S I N C . , <br /> 3 <br /> October 25, 1999 <br /> 17292.0004 . <br /> t <br /> Mr. Jeff Wong <br /> San Joaquin County Public Health Services <br /> i <br /> Environmental Health Division <br /> 304 E.-�Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Summary Report for September 1999 Supplemental Subsurface Investigation at the <br /> Transportation Center/Corporation Yard, 1932 El Pinal Drive, Stockton, <br /> t California <br /> i Dear Mr. Wong: <br /> ATC Associates Inc. has prepared this letter-report, on behalf of Stockton Unified School District <br /> (SUSD) to serve as as technical report summarizing additional subsurface investigation activities at <br /> the District's Transportation Center/Corporation Yard, 1932 El Pinal Drive, Stockton, California <br /> (Figure 1). The purpose of the additional subsurface investigation was to further define diesel <br /> contamination reported in the vicinity of the site's former diesel underground storage tanks <br /> (USTs). This work was requested in San Joaquin County Public Health Services, Environmental <br /> Health Division (PHSIEHD) correspondence dated June 25, 1999. <br /> BACKGROUND <br /> Site Location <br /> The site is located on the east side of El Pinal Drive, Stockton, California, as shown on Figure 1. <br /> The location is primarily commercial. I <br /> Remote Fill Pipeline and Diesel Tanks <br /> In December 1996, three diesel USTs and an associated remote fill pipeline were removed (see <br /> Figure 2). Soil samples were collected from the tank excavation and from a depth of 2 feet below <br /> the bottom of the pipeline trench at 20-foot intervals. <br /> Due to staining noted near the southern-most diesel UST, the base of the excavation near the tank <br /> was overexcavated to a depth of approximately 18 feet below ground surface (bgs), the maximum <br /> depth the backhoe could reach. Following sample collection, the excavation was backfilled with <br /> wA17292Veports\Supp1 Invest.doc 1 <br /> I- - <br />