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CVATCi--, <br /> 1117 Lone PalmAvenue <br /> Suite B <br /> Modesto. CA 95351 <br /> 209.579.2221 <br /> A S S O C I A T E S I IN c . Fax 209.579.2225 <br /> August 30, 1999 ENVIRONMENTAL HEALTH DIVISION <br /> 17292.0004 304 E, Weber Ave. Third Floor <br /> P 0, Box 368, Sq <br /> on CA 95201-0388 <br /> Approved , <br /> Denied Cl <br /> Conditions <br /> Mr. Jeff Wong <br /> San Joaquin County Public Health Services Date by <br /> Environmental Health Division / <br /> 304E. Weber Street; Third Floor <br /> Stockton, <br /> on, California 95202 <br /> Subject: Work Plan for Supplemental Subsurface Investigation at the Transportation <br /> Center/Corporation Yard, 1932 EI Pinal Drive, Stockton, California <br /> Dear Mr. Wong: <br /> INTRODUCTION <br /> ATC Associates Inc. has prepared this letter-report, on behalf of Stockton Unified School <br /> District (SUSD) to serve as a work plan for additional subsurface investigation activities at the <br /> District's Transportation Center/Corporation Yard, 1932 El Pinal Drive, Stockton, California <br /> (Figure 1). The purpose of the additional subsurface investigation is 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 (PHS/EHD) correspondence dated June 25, 1999. <br /> Site Location <br /> The site is located on the east side of EI Pinal Drive, Stockton, California, as shown on Figure 1. <br /> The location is primarily commercial. <br /> Background <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 <br /> below the bottom of the pipeline trench and at 20-foot intervals. <br /> Due to staining noted near the southem-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 <br /> w:\17292\reports\workp1an.doe I <br />