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ENVIRONMENTAL HEALTH DEPARTMENT <br /> o�-'I SAN JOAQUIN COUNTY <br /> so._��.coG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bergman,R.E.H.S. <br /> Q. �• •- 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> t?.1` Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • �., `P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �iFOR Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> ROBERT COCHRAN NOV 17 2003 <br /> CHEVRON PRODUCTS COMPANY <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0904 <br /> RE: Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan <br /> for Monitoring Well Installation, dated 24 June 2003 and submitted on your behalf by <br /> Secor International Incorporated (Secor). Four shallow groundwater monitoring wells <br /> (MW-14, MW-15, MW-16, and MW-17) and one deep groundwater monitoring well <br /> (MW-15D) will be advanced to 34 and 60 below ground surface (bgs), respectively, <br /> using 8-inch and 11-inch hollow-stem augers, and soil samples will be collected at 5-foot <br /> intervals for logging purposes, from ground surface to the total completion depth. <br /> Selected soil samples will be analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons <br /> as motor oil (TPHmo), benzene, toluene, ethyl benzene, total xylenes (BTEX), methyl <br /> tertiary-butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane <br /> (1,2-DCA), and 1,2-dibromoethane (EDB). <br /> EHD approves the work plan as submitted for replacement of monitoring wells destroyed <br /> during the removal of the former station facilities; however, the work plan does not <br /> address the criteria to be used for determining the screen intervals. Please submit the <br /> objectives and rational for selecting the screen intervals. EHD recommends continuous <br /> coring in the general target intervals are met <br /> o better characterize <br /> Please address <br /> a entheseulssuessand to <br /> at you <br /> ensure that the monitoring objectives <br /> earliest convenience. <br /> ry <br /> Further investigation of contamination <br /> groundwater <br /> wPlease submill be it a twork planassess the <br /> to <br /> vertical extent of impacted groundwater at this <br /> address vertical extent of contamination at this site by 5 January 2004. <br />