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J <br /> L it ,jll�rFf�L lir <br /> C A M B R I A �7, R<<Y �cr-VICE <br /> i 3 JUL21 PM I2= 53 <br /> July 17, 2003 <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re Site Investigation Report and Request for Closure <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton,California <br /> SAP Code 136139 <br /> Incident No 98996180 <br /> SJCEHD Site Code 1660 <br /> Dear Ms Duncan <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) to document the site investigation activities <br /> performed in October 2002 at the above referenced site The purpose of the investigation was to <br /> further assess the perched water conditions near the northwestern dispenser island Cambria <br /> followed the scope of work presented to our June 17, 2002 Site Investigation Work Plan and <br /> r approved in San Joaquin County Environmental Health Department (SJCEHD) correspondence <br /> dated August 16, 2002 SJCEHD's May 20, 2002 correspondence initiated the investigation, and <br /> the work was performed in accordance with SJCEHD and Central Valley Regional Water Quality <br /> Control Board guidelines <br /> SITE LOCATION AND DESCRIPTION <br /> The site is an operating service station located on the northeastern corner of the intersection of <br /> Lower Sacramento Road and Hamner Lane in a commercial area of Stockton, California <br /> (Figure 1) The site layout includes a service station building, three dispenser islands, three <br /> existing underground fuel storage tanks (USTs), and a former fuel UST complex(Figure 2) <br /> Oakland CA PREVIOUS WORK <br /> Sonoma CA <br /> P o r t I a n d 0 R 1988/1989 Tank Removal During December 1988 and January 1989, two 5,000-gallon and two <br /> S e a t t i e WA <br /> 8,000-gallon steel fuel USTs and associated piping were removed from the site Soil samples <br /> Cambria collected from beneath the former tanks contained total petroleum hydrocarbons calculated as <br /> EnVITOnmental gasoline (TPHg) at concentrations up to 4,880 parts per million (ppm) and up to 3 0 ppm. <br /> Technology,Inc benzene Soil samples collected from beneath dispenser islands contained up to 1,510 ppm <br /> Olkins Street TPHg and 156 ppm benzene, with the highest concentrations beneath the northwestern <br /> P 4 Box 259 <br /> Sonoma CA 95476 <br /> k Tel(707)935-4$50 <br /> Fax(707)935-6649 <br />