Laserfiche WebLink
l � <br /> ENVIRONIENTAL HEALTH tEPARTMENT <br /> pp.U1N SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> cgt�•FoeN�P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Corolla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> DENIS L BROWN SEP 15 2005 <br /> SHELL OIL PRODUCTS <br /> 20945 S WILMINGTON <br /> CARSON CA 90810-1039 <br /> RE: Shell-branded Service Station SITE CODE: 1223 <br /> 6131 Pacific Ave <br /> Stockton CA 95207 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed <br /> Corrective Action Plan and Risk-Based Corrective Action Analysis (CAP) dated <br /> September 9, 2005 submitted on your behalf by Cambria Environmental <br /> Technology, Inc. (Cambria) and has the following comments. <br /> At a meeting held on June 9, 2005, Shell, Cambria and SJC/EHD discussed that <br /> interim remediation by dual phase extraction (DPE) should continue at this site, <br /> and that a CAP would be prepared. Cambria had recommended the preparation <br /> of a CAP in Interim Remediation Report dated February 9, 2005; SJC/EHD <br /> agreed with the recommendation in correspondence dated May 17, 2005 and <br /> directed the CAP be submitted no later than July 8, 2005. At the June meeting <br /> Cambria requested a deadline extension for submittal of the CAP until <br /> September 9, 2005. Preparation of a Risk Based Corrective Action (RSCA) <br /> analysis was neither discussed nor directed. <br /> SJC/EHD does not approve the site specific target levels (SSTL's) proposed by <br /> Cambria for this site based on the RBCA and ASTM guidance documents. The <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) does not set <br /> numerical clean up goals except those established as maximum contaminant <br /> levels (mcl's) or water quality objectives in the Basin Plan. Site remediation <br /> systems are typically operated until the site returns to background conditions or <br /> until the systems lose cost effectiveness. <br /> The CAP recommends DPE as the most feasible remedial strategy for this site. <br /> Cambria proposes installation of four additional extraction wells to complete the <br /> system. Extracted vapors will be treated with an oxidizer; extracted groundwater <br /> will be treated with granular activated carbon (GAC). Cambria estimates the <br /> system will be in operation for 2-4 years. <br />