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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> OP C <br /> Unit Supervisors <br /> Donna K.Heran,R.F,.H.S. <br /> =t Directo 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, son,R.E.H.S.,R.D.I. <br /> -- -' Douglas W.Willson,R.E.H.S. <br /> cq'.;,.rrr..: c • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �!Fo% Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> g g Mark Barcellos,R.E.H.S. <br /> EDWARD RALSTON RM TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL RD STE 120 <br /> ROSEVILLE CA 95661 <br /> RE: TOSCO-Service Station #1205 SITE CODE: 507198 <br /> 16470 Cambridge St. RO#:0000138 <br /> Lathrop, CA., 95330 <br /> WORK PLAN: "Five (5) Day Dual Phase Extraction Pilot Test" <br /> DATED: February 19, 2002. <br /> PREPARED BY: Secor— Rusty Benkosky, P.E. <br /> STATUS: APPROVED (with conditions noted below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S <br /> 25299.37, subd(c)(3)1: <br /> • Conduct soil vapor and groundwater extraction testing from existing <br /> monitoring wells onsite for field data to support remedial feasibility and, <br /> • Collect soil vapor samples during five-day test and analyze for TPHg, <br /> BTEX, MtBE, and submit report of findings S-EHD. <br /> COMMENTS AND CONDITIONS: <br /> • A `representative' sample is to be analyzed for 1,2-DCA, EDB, MtBE and <br /> Oxygenates by EPA 8260B and Total Lead by EPA 6010 in at least one <br /> groundwater and one vapor sample and, <br /> • Report of findings due at EHD within ninety (90) days of end of DPE and <br /> is to include a complete schedule (submittal dates for work plans to <br /> continue investigation for delineation, remedial testing, and submittal of <br /> the Problem Assessment Report etc.) and <br /> • If DPE found to be not feasible for remedial action, include <br /> recommendations for additional alternatives in report of findings. <br /> REASONS FOR DISAPPROVAL OF THE WORK PLAN [H&S 25299.37, <br /> subd(c)(3)]: <br /> None / n <br /> DATED: February 26, 2002. BY: <br /> Michael Infurna, eni R S (209) 468-3454 <br /> Faxed to consultants [ X ] , 2L oz/. FILE COPi„ <br />