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ENVIRONMENTAL HEALTH riEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2:' Tr v&—p y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> �II Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> l � Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> r. Program Manager Douglas W.Wilson,R.E.H.S. <br /> cy�iFOR�• Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> OLYMPIAN JAN 2 6 2006 <br /> 2000 ALAMEDA DE LAS PULGAS <br /> SUITE 242 <br /> SAN MATEO CA 94403 <br /> RE: _Jimco Truck Plaza SITE CODE: 1604 <br /> 1022 Frontage Road (Formerly 22502 S. Highway 99) <br /> Ripon, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Feasibility <br /> Test Report, dated November 16, 2005, Site Assessment Report, dated December 16, <br /> 2005, and Quarterly Monitoring Report — Fourth Quarter 2005 dated December 30, <br /> 2005, all prepared by Cambria Environmental Technology, Inc. (Cambria) on your <br /> behalf. <br /> In Feasibility Test Report, Cambria discusses procedures, equipment, and test results <br /> obtained during a soil vapor extraction (SVE) pilot test on September 8, 2005, and a <br /> combined SVE-air sparge (SVE/AS) pilot test on September 9, 2005. Cambria concluded <br /> that SVE/AS appeared to be an effective remedial method and plans to compare this <br /> cleanup method with other remedial alternatives when Cambria submits Feasibility <br /> Study/Corrective Action Plan (FS/CAP). EHD does not believe that this site is <br /> adequately characterized to submit a CAP at this time; however, if Cambria can <br /> demonstrate a need for immediate remedial action, the preferred remedial method can be <br /> presented as an interim remediation plan. <br /> In Site Assessment Report, Cambria presented the results obtained during the installation <br /> of monitoring well MW-10 and air sparging well AS-1, and the advancement of soil <br /> boring B-18. Cambria concluded that impacted soil is vertically delineated at the source <br /> area for all chemicals of concern based on non-detect analytical results for soil samples <br /> collected on August 16, 2005, at 36, 46, and 51 feet below ground surface (bgs) from 13- <br /> 18. EHD concurs with this interpretation; however, based on groundwater analytical <br /> results showing high concentrations for diesel, motor oil, and gasoline constituents in the <br /> groundwater samples collected at 60 feet bgs from B-18, impacted groundwater does not <br /> appear to be delineated vertically at this site. Cambria also stated that the methyl tertiary- <br /> butyl ether (MTBE) plume is adequately defined in all directions. EHD does not agree <br /> with this interpretation. During the recent groundwater monitoring event on November <br /> 15, 2005, MTBE was detected in the two monitoring wells located west of the source <br /> area at 200 micrograms per liter(µg/L) in MW-9, and 340 µg/L in MW-10. Considering <br />