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C A M B R I A <br /> • FEB 1 i 2005 <br /> g,%j1n01Jk1E4T HEALTH February 9,2005 <br /> PERMITISERVICES <br /> Ms Lon Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Ave, Third Floor <br /> Stockton, California 95202 <br /> Re Interim Remediation Report <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> © Stockton, Calitora <br /> SAP Code 1361436149 <br /> Incident No 98996189 <br /> SJCEHD Site Code 1223 <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) for the referenced site In Cambria's <br /> February 12, 2004 Interact Reinediatton Work Plwi Addendum, Cambria proposed dual-phase <br /> . extraction (DPE) for interim remediation of residual source area petroleum hydrocarbons <br /> Cambria conducted three days of DPE on well VEW-2 trom June 21 through June 24, 2004, and <br /> two days of DPE on well VEW-1 from June 24 through 25,2004 The tollowmg sections describe <br /> the site background and sunirriarize the DPE interim remedial measures <br /> SITE LOCATION AND DESCRIPTION <br /> The subject site is an active Shell-branded service station located on the southwest comer of the <br /> mtersection of Pacific Avenue and Porter Avenue in a mixed commercial and residential area of <br /> Stockton, California (Figure 1) The site layout includes three existing tuel underground storage <br /> tanks (USTs), tour dispensers, a service station building, and a former UST complex (Figure 2) <br /> PREVIOUS WORK <br /> 1990 Soil Borings Dunne March 1990 Aegis Envirorunental Consultants (Aegis) of Roseville <br /> California drilled fourteen soil borings near the former (then existmg) and current (then proposed) <br /> Cambria <br /> Environmental UST locations The highest concentrations of petroleum hydrocarbons were detected in a sot] <br /> Technology,Inc boring at the southwest corner of the former UST location Maximum concentrations were <br /> 00Hours sneer <br /> 17,000 parts per million (ppm) low/medium boiling point hydrocarbons quantitated against a <br /> Suite gasoline standard and 400 ppm benzene, both at a depth of 15 tett below grade (tbg) This <br /> Emeryville CA94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />