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CAM BRIA <br /> i <br /> May 20, 2005 <br /> Mr Mike County <br /> yj <br /> San Joaquin <br /> m County Environmental Health Department 1 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 MAY <br /> Re Overexcavation Report/Site Conceptual Model {RpNmEw HEAJi <br /> Former Shell Service Station PERMMSERVICES <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 136144 <br /> Incident No 98996184 <br /> SJCPHS Site 1071 <br /> Dear Mr lnfurna <br /> Cambria Environmental Technology, Inc (Cambria) prepared this document on behalf of <br /> Equilon Enterprises LLC dba Shell Oil Products US (Shell) to describe overexcavation activities <br /> that occurred at the subject site This report also includes documentation of the soil assessment <br /> work performed in June 2004, and the well destruction activities performed in August 2004 And <br /> as requested by the San Joaquin County Environmental Health Department (SJCEHD), a site <br /> conceptual model (SCM) for this site is included in this document <br /> SITE BACKGROUND <br /> Site Description The subject site is located on the northeastern corner of the intersection of <br /> Country Club Boulevard and Plymouth Road in Stockton, California (Figure 1) The site is a <br /> former service station with a site layout that includes a service station building, and two <br /> dispenser islands The subject site is located adjacent to, and east of, Interstate Highway 5 in a <br /> residential area of Stockton <br /> Site History: Details of previous site investigation work are documented in Cambria's <br /> February 13, 1998 Corrective Action Plan From March 1999 through July 2001, interim <br /> remedial action in the form of periodic groundwater extraction (GWE) was performed utilizing <br /> well RW-1A On June 20, 2001, a permanent GWE and treatment system began removing <br /> groundwater, treating it, and discharging it directly into the sewer system This GWE system is <br /> still in operation at this site <br /> Cambria <br /> Environmental November 2004 UST Removal During November 2004, two 15,000-gallon underground <br /> hnology,Inc <br /> 0 <br /> storage tanks (USTs) and the associated product piping were removed A 550-gallon waste oil <br /> 270 Perkins Street <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />