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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN �OAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> a < Director 304 East Weber Avenue, Third Floor <br /> T_ Mike Huggins,R.E.H.S.,R.D.I. <br /> At oisen,R.E.H.S. Stockton, California 95202-2708 Dougl t�sog�t. <br /> Program Manager Telephone: (209) 468-3420 Mar ago o`7;! <br /> gCijE6'0 <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robe c n, H <br /> Program Manager Ma ar��o�,1��. �3 <br /> BY:-------------------- <br /> ROBERT COCHRAN <br /> CHEVRON PRODUCTS COMPANY NOV 17 2003 <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 to better characterize the sand occurrences and to <br /> ensure that the monitoring objectives are met. Please address these issues at your <br /> earliest convenience. <br /> Further investigation of contamination in groundwater will be necessary to assess the <br /> vertical extent of impacted groundwater at this site. !Please submit a work plan th <br /> I address vertical extent of contamination at this site by 5 January 2004. <br />