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02/26/2002 08 52 2094683433 FIFTH FLOOR PAGE 02 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY UArsu wsors <br /> a Donna K.Henan,R.E.H.S. Pe►' <br /> ` Director 304 East Weber Avenue,Third Floor Carl Borrnan,R E Hs <br /> • - Al Olsen,R.E.H S. Stockton, California 95202-2708 Mike Huggins,R B14 S.R D I <br /> Program ManagerDouglas W Wilson,R-F-H S <br /> lla <br /> Laurie A Cotu ,ILE H S Telephone- (209)468-3420 Margaret Lagono,R RH s <br /> Fax (209)464-0138 Robert McClellon,RB H S <br /> Program Manager Mark Barcellos,R E H S <br /> EDWARD RALSTON <br /> TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL RD STB 120 <br /> ROSEVILLE CA 9566 . <br /> RE: TOSCO-Service Station #1205 SITE CODE 507198 <br /> 15470 Cambndge 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 Rusbe Benkosky, P.E. <br /> STATUS: APPROVED iwlth conditions noted below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S <br /> 25299 37, subd(c)(3)] <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 TPI-Ig, <br /> BTEX, MtBE, and submit report of findings S-END. <br /> COMMENTS AND CONDITIONS <br /> f 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 erid 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)1- <br /> a None <br /> DATED February 26, 2002. BY• # p <br /> Michael Infuma, eni R S (209)4 8-3454 <br /> Faxed to consultants <br />