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ENVIRONMENTAL HEALTH DEPARTMENT <br /> p SAN JOAQUIN COUNTY <br /> • !<'�� ,c Unit supervisors <br /> ,'; Donna 1C Henan,R E H S 304 East Weber Avenue, Third Floor Carl Borgman R E H S <br /> < Director Mike Huggins,R E H S,R D I <br /> • Al Olsen,R lE H S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> c4c!oR �PProgram Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> Laurie A Cotulla,R E H S Robert McClellon,R E H S <br /> Program Manager Fax. (209}464-013$ <br /> Mark Barcellos,R E H S <br /> JUL 2 4 20OZ <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 r`,Tr'.CO Stzt.orn#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 /> . E ROVFI� <br /> ADDENDUM NEEDED IJ Submit by August 23.2002 <br /> ADEQUATE -kND NECESSARY ELEMENTS OF THE WQRK PLAN [H&S 25299 37,subd(c)(3)] <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 /> CONJIMENTS AND CONDITIONS <br /> 1 Groundwater analytical data from deeper screened monitoring wells located onsite and on the east side of Center <br /> Street indicates that the vertical extent of the groundwater contaminatyon has not been defined In addition to the <br /> proposed shallow wells,deeper screened wells must be installed to continue the mvestngauon 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 /> LMA' DL-V Cat ti <br /> -- <br /> Lou Duncan,Senior REHS Nuel C Henderson,J r,R G <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Urut N <br /> cc Marty Hartzell,CVRNVQCB <br /> /ill Brown,Daley&Heft <br /> ✓Vernon Elarth,URS <br /> A <br />