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C A M B R I A <br /> October 15, 2002 <br /> Mr Robert J Castelli <br /> Technical Services Supervisor <br /> c/o Mr Richard Stiffler <br /> City of Stockton Department of Municipal Utilities <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> OCT zonz <br /> Re Self-Monitoring Report ! fuVl�, 1 r ALTH <br /> Shell-branded Service Station PLR,vIlLSLRV,CLES <br /> 2575 Country Club Blvd <br /> Stockton, California <br /> Incident#98996184 <br /> SAP 136144 <br /> Dear Mr Casteih <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambria Environmental <br /> Technology, Inc (Cambria) presents this self-monitoring report for the referenced site Discussed <br /> below are the site background, a description of the treatment system, system sampling, system <br /> performance, and planned future activities <br /> SITE BACKGROUND <br /> The subject site is located on the northeastern cornier of the intersection of Country Club Boulevard <br /> and Plymouth Road in Stockton,California The site is an operating service station with a site layout <br /> that includes a service station building, an underground fuel storage tank(UST)complex located in <br /> the southwestern corner of the site,four dispenser islands, and a waste oil tank The location of the <br /> former UST complex is in the southeastern portion of the site <br /> In March 1999, groundwater was extracted weekly from well RW-1A using a high-vacuum truck <br /> During August 2000, a submersible pump was installed to pump groundwater from the well into an <br /> aboveground storage tank Water, accumulated in the tank, was emptied periodically by a vacuum <br /> truck and transported to the Martinez refinery for recycling Between March 26, 1999 and <br /> Oakland CA July 17, 2001, a total of 622,649 gallons of groundwater was pumped from RW-1A, removing an <br /> San Ramon CA <br /> Sonoma CA estimated 397 pounds(lbs)of total purgeable hydrocarbons as gasoline(TPHg),63 1 lbs of benzene, <br /> and 671 lbs of methyl tertiary butyl ether(MTBE) On May 31,2001, constriction of a permanent <br /> Cambria groundwater extraction (GWE) system was completed <br /> Environmental <br /> Technology,Inc <br /> akin$Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />