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M, <br /> II I <br /> ENVIROlMENTAL HEALEPARTMENT <br /> PpU�/y <br /> SAN JOAQUIN COUNTY <br /> 2 r y Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R:D.L <br /> Douglas W.Wilson,R.E.H.S. <br /> OgC,FOR��P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,RX.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> JIM PARKINSON MAY 2 7 2005 <br /> PARKINSON' S ARCO <br /> 3250 W HAMMER LANE <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO SITE CODE 2224 <br /> 3250 W Hammer Lane RO: 709. <br /> Stockton, CA 95209 <br /> San Joaquin County Environmental Health Department (EHD) has'reviewed Corrective <br /> Action Plan for Parkinson's Hammer I-S Arco (CAP), dated October 26, 2004, and First <br /> Quarter 2005 Groundwater Monitoring Report, dated March 23, 2005, prepared and <br /> submitted on your behalf by Shaw Environmental, Inc. (Shaw). In this CAP, Shaw. <br /> presents site conditions, soil and groundwater analytical results, and evaluates several <br /> methods for site remediation, including natural attenuation and degradation, ozone <br /> microsparging, and dual-phase extraction. Based upon cost consideration and possible. <br /> expedition of site closure, Secor recommends ozone „microsparge as the remedial <br /> alternative. <br /> EHD concurs with Secor's recommendation to install an ozone microsparge system. <br /> However, you must first get approval for the proposed ozone microsparging from the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB). Please contact <br /> James Barton, P.G. at CVRWQCB for information by telephone at (916) 464-4615 or by <br /> electronic mail atibaiton(cr-waterboards.ca.gov. <br /> Review of site data leads EHD to�change its opinion stated by letter dated August 24, <br /> 2004. EHD now believes that further groundwater investigation is necessary to assess the <br /> vertical extent of hydrocarbon contamination in the area of cone penetrometer test boring <br /> CPT-3. Based on the detection of benzene at 57 feet below surface grade (bsg) in CPT-3 <br /> and the CPT-3 boring log, EHD recommends that a monitoring well screened in the thin <br /> sand layer between 55 and 60 feet bsg be installed to assess vertical and lateral extent of <br /> contamination. Please submit a work plan for monitoring this interval to EHD by <br /> September 14, 2005. <br /> To _assist in this site investigation, please provide contaminant mass estimates, with <br /> assumptions and calculations, for. sorbed gasoline, benzene, and methyl tertiary-butyl <br /> ether(MTBE) at this site. Submit the mass estimates to EHD by.September 14, 2005. <br />