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ENVIRONMENTAL HEALTHI)EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.H R.E.H.S. East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> '^ice Direrectorctor Mike Huggins,R.E.H.S.,R.D.I. <br /> . Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • C9(,pppi+�P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,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 /> PAUL SUPPLE MAY 1 0 2004 <br /> ATLANTIC RICHFIELD COMPANY <br /> PO BOX 6549 <br /> MORAGA CA 94570 <br /> RE: ARCO Station#595 Site Code: #0707 <br /> 6100 N.Highway 99 <br /> Stockton CA 95212 <br /> WORK PLAN: Work Plan for Additional Site Assessment <br /> DATED: May 6,2004 <br /> PREPARED BY: SECOR International Incorporated <br /> APPROVED: fx] <br /> DISAPPROVED: [ ] <br /> ADF UATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37,subd(c)(3)]: <br /> 1. Installation of two shallow groundwater monitoring wells to replace existing on site monitoring wells MW-2 and <br /> MW-4,which have not contained enough groundwater to sample for two years. <br /> 2. Installation of five deep groundwater monitoring wells to investigate the lateral and vertical extent of the deep <br /> contaminant plume: Four wells to —100 feet bsg;one well to—150 feet bsg. The borings will be continuously <br /> cored at depth to place the screen intervals over appropriate water bearing zones. <br /> 3. Access agreements will be obtained from offsite property owners. <br /> CO'iL%IENTS AND CONDITIONS: <br /> 1. SJC/EHD recommends installation of an additional 100-foot deep well close to MW-9 to evaluate the zone as the <br /> 1,2-DCA contributor to the domestic well DW-1. If DW-1 pulls the contaminants downward,a deep well at the <br /> proposed location to the west of DW-1 may be non-detect. <br /> 2. Submit a San Joaquin County Well Permit Application and required$89.00 permit fee for each parcel of land <br /> on which drilling will take place. Access agreements must be submitted with the permit applications. <br /> 3. A report of findings must be submitted to SJC/EHD within 60 days following completion of all fieldwork. <br /> ('e/M. '� _5��444 <br /> Lori Duncan,Senior REHS Nuel C.Henderson,Jr.,R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton,CVRWQCB <br /> Rusty Benkosky,SECOR <br />