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ENV.IR�NMENTAL HEALli DEP <br /> SAN JOAQUIN COUNTY <br /> a8 Donna K.Heran,R.E.H.S. <br /> U): ,- Unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> c9�fFo'Ri�P Program Manager Telephone: (209) 468-3420 Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> - -Mark Barcellos,R.E.H.S. <br /> ROBERT COCHRAN <br /> CHEVRON PRODUCTS COMPANY <br /> P O BOX 6004 <br /> "SAN RAMON CA 94583-0904 <br /> 'RE: Chevron Service Station 9-0557 j <br /> 139 South Center Street <br /> Stockton, CA 95202 <br /> I <br /> WORKPLAN: Addendum to Work Plan for Monitoring Well Installation <br /> DATED: December 30, 2003 Ir <br /> REPARED BY: Secor International Incorporated <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health&Safety Code(H&S)Section f <br /> 25299.37(c)(3)]: <br /> 1. Advancement of one cone penetrometer test(CPT)boring to approximately 90 feet below ground surface(bgs) <br /> to assess soil lithology and the advancement of one direct-push borehole adjacent to the CPT borehole to collect <br /> groundwater samples in discreet water bearing zones. <br /> 2. The borings for monitoring wells MW-14,MW-15,MW716,and MW-17 will be continuously cored. <br /> i <br /> 3. Screen intervals for the monitoring wells will be determined by the CPT results. <br /> 4. Groundwater samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg), total petroleum <br /> hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as motor oil (TPHmo), benzene, toluene, ethyl <br /> benzene, total xylenes (BTEX), methyl tertiary-butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl <br /> ether(DIPS),ethyl tertiary butyl ether(ETBE),tertiary amyl methyl ether(TAME), 1,2-dichloroethane <br /> (1,2-DCA),and 1,2-dibromoethane(EDB). <br /> COMMENTS AND CONDITIONS: <br /> 1. Obtain a boring permit for the CPT boring and monitoring wells from San Joaquin County Environmental Health <br /> Department(EHD)and notify EHD at least 48 hours prior to the proposed scheduled work dates. <br /> i <br /> DATED,? 13 &413Y e <br /> cc: James L.L.Barton,CVRWQCB <br /> David Evans,Secor <br /> i <br />