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C A M B R I A CSY `=o <br /> EPiVis7QF��9 NT 1�F_�LTt� February 9, 2005 <br /> PERM IMSERVICES <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Ave, Third Floor <br /> Stockton, Cahtorma 95202 <br /> Re Interim Remediation Report <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, Califorrna <br /> SAP Code 136149 <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 Interim Rernediattvn Work Platt 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 from June 21 through June 24, 2004, and <br /> two days of DPE on well VEW-1 from June 24 through 25, 2004 The following sections describe <br /> the site background and suniriiarize 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 /> intersection 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 fuel 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 During March 1990 Aegis Environmental Consultants (Aegis) of Roseville <br /> Cambria California drilled fourteen soil borings near the former (then existing) and current (then proposed) <br /> Environmental UST locations The highest concentrations of petroleum hydrocarbons were detected in a soil <br /> Technology,Inc boning at the southwest corner of the tormer UST location Maximum concentrations were <br /> 100 Hollis Street <br /> 17,000 parts per riullion (ppm) low/medium, boiling point hydrocarbons quantitated against a <br /> Suite A gasoline standard and 400 ppm benzene, both at a depth of 15 feet below grade (fbg) This <br /> Emeryville CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />