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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 ffI <br /> RECE <br /> ED <br /> March 31, 2008 APR - 12008 <br /> Ms. Lori Duncan ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Workplan for Additional Site Investigation <br /> 640 N. El Dorado Street, Stockton, California <br /> Site Code: 1090 <br /> Dear Ms. Duncan: <br /> This workplan is submitted by Ground Zero Analysis, Inc. (Ground Zero) on behalf of Gene <br /> Gabbard Inc. to address San Joaquin Environmental Health Department's (EHD) December 28, <br /> 2007 request for additional investigation at the subject site. The location of the site is shown on <br /> Figure 1. <br /> SITE BACKGROUND <br /> The site currently houses a specialty automotive sales and service center. Previous site occupants <br /> operated a 250-gallon underground storage tank (UST) for storage of waste oil. The UST was <br /> removed under permit from EHD on March 26, 1997. A soil sample collected from beneath the <br /> tank contained elevated levels of petroleum hydrocarbons, lead, and volatile organic compounds <br /> (VOCs). Table 1 summarizes the analytical results of soil samples collected during the UST <br /> removal. <br /> Initial Soil Boring Investigation <br /> Ground Zero directed the drilling and sampling of eight soil borings (SB 1 through SB 8) near the <br /> former UST in January and October 1999 to investigate the vertical and lateral extent of soil <br /> contamination and to determine if groundwater beneath the facility had been impacted by past <br /> site operations. Laboratory analyses of soil and "grab" groundwater samples collected during the <br /> investigations indicated that petroleum hydrocarbons and VOCs had impacted soil and <br /> groundwater in the immediate vicinity of the former UST. The vertical extent of soil <br /> contamination was defined at the source (SB3), as no petroleum hydrocarbons or VOCs were <br /> detected deeper than 31 feet below ground surface (bgs). <br /> GAGR0UNDZE\GABBARD\workp1ms\wp_0308.doc <br />