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10/29/2003 15 31 2094683433 FIFTH FLOOR PAGE 02 <br /> EN RONMENTAE HEALTH]DEPARTMENT <br /> SAN J OA Q UIN COUNTY <br /> x4 rA Unci Srepervtsars <br /> r x Donna K Fleran,%E H SCarl$or an.R E N S <br /> s <br /> Director 304 East Weber Avenue,Third Floor Mike Huggins, H S,R D i <br /> A]013eu,R9 H S Stockton, Califorrua 95202-2708 Douglas w Wilson,R E N S <br /> • ��KcF4t+�'�r• Program Manager Telephone (209)468-3420 Margwvt I.agono,RE H S <br /> Laurie A,Cotulla,R_E H-S Fax (209) 464-013 8 Robert McClellon.R E H S <br /> Program Manager Mark Barcellos,R E H S <br /> ROBERT COCHRAN ,SGT 1 2003 <br /> CHEVRON PRODUCTS COMPANY <br /> P 0 BOX 6004 <br /> SAN RAMON CA 94583-0804 <br /> RE Chevron Service Station 9-1452 <br /> 334 East Mata Street <br /> Ripon,California <br /> San Joaquin County Environmental Health Department(EHD)has reviewed Aquifer Test Report <br /> and Work Pian for Interim R2medtal Measure, dated 26 June 2043,prepared by Secor <br /> Intemational Incorporated(Secor)on your behalf 'file above referenced work pian for an interim <br /> rernedtation measure to reduce dissolved methyl tertiary-butyl ether(MTBE)by extracting <br /> approximately 8,000 gallons of groundwater from monitoring well (MW-8)by a single vacuum <br /> truck each month for six months,is approved as written However,it has not been shown that <br /> short-term,periodic groundwater extraction will provide hydraulic control on the plume of <br /> . impacted groundwater As the plume appears to be migrating off site toward the southwest, <br /> where the plume is not readily accessible,it would seem that hydrological control of the plume <br /> would be a primary objective,therefore,EHD believes that a continuous pumping program would <br /> better control the MTBE plume <br /> During this investigation,please provide the follovnng information,monthly, in a bnef report <br /> * Gallonage of water extracted <br /> a Average MTBE concentrations <br /> MTBE mass removed,and <br /> s Total MTBE mass removed to date <br /> Quarterly groundwater monitoring reports should provide an analysis and discussion of the <br /> hydraulic control exerted by the monthly extraction events on plume migration Please include a <br /> brief narrative that addresses this issue <br /> If you have any questions regarding this letter,please contact Vicla McCartney,REHS,at <br /> (209)458-3456 <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> V1C1C1 McCartney,REBS Nuel C Henderson,Jr. RG <br /> Unit IV-Site Mitigation Unit N- Site Mitigation <br /> cc David Evans- Secor <br /> James L L Barton-CVRWQCB <br />