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FILE GUY <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAN IN COUNTY <br /> �o .caG Unit Supervisors <br /> z. Z Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> "} :� 304 East Weber venue, Third Floor <br /> Lo. Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, Calif rnia 95202-270$ Douglas W.Wilson,R.E.H.S. <br /> • p • <br /> Program Manager <br /> Telephone: <br /> g g 209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4�+FOR`' Laurie A.Cotulla,R.E.H.S. 464-013$ Robert McClelloa,R.E.H.S. <br /> - -Program Manager Fax- (20 ) Mark Barcellos,R.E.H.S. <br /> --- --JUL 2.4 2000 . .. . _ . <br /> PAUL SUPPLE KITTY WALKER <br /> ATLANTIC RICHFIELD CO COS REDEVELOPMENT AGENCY <br /> PO BOX 6549 305 N EL DORADO STREET <br /> MORAGA CA 94570 STOCKTON CA 95202 <br /> RE: ARCO Station#4493 Site Code: #.1042 <br /> 205 Center Street <br /> Stockton CA 95202 <br /> WORK PLAN: "Work Plan for Monitoring Well Installation" <br /> DATED: July 5,2002 <br /> PREPARED BY: URS Corporation <br /> - -_. --,APPROVED: - - - <br /> DISAPPROVED. <br /> ADDENDUM NEEDED: x Submit: August 23-,20Q2 <br /> ADEQUATE AND NECESSARY ELEMENTS OF THEW PLAN [H&S 25299.37,subd(c)(3)j: <br /> 1. Installation of two shallow monitoring wells for investigation of the lateral extent of the shallow plume. Proposed <br /> total depth of the wells is 30 feet below surface grade. <br /> COMMENTCOMMMNU AND CONDITIONS: <br /> 1. Groundwater analytical data from deeper screened monitoring wells located onsite and on the east side of Centex <br /> Street indicates that the vertical extent of the groundwater contamination has not been defined. In addition to the <br /> proposed shallow wells,deeper screened wells must be installed to continue the investigation of the vertical and <br /> lateral extent of the plume. Selected screen intervals for deeper wells should be based on a site conceptual model and <br /> anticipated preferential groundwater flow paths. Submit an addendum to the work plan to address these issues. <br /> Lori Duncan,Senior REHS Nuel C.Henderson,Jr.,R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: Marty Hartzell,CVRWQCB <br /> Bill Brown,Daley&Heft <br /> Vernon Elarth,URS <br />