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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2 so <br /> ig " <br /> Unit Supervisors <br /> ( Donna K Heran,R E H S Carl Sor man,R E H S <br /> Director 304 East Weber Avenue, Third Floor gAl Olsen,R E H S Stockton, California 95202-2708 Mike llas W s,R l;H S,R D l <br /> Pro ram Marra er Douglas W Wilson,R E fI S <br /> g Telephone (209) 468-3420 Margaret Lagorio,RE H S <br /> Laurie A Cotulla,R E H S Robert McClellon,R E H S <br /> Program Manager Fax (209) 464-0138 RoRo <br /> S S W4 Yt� 1 <br /> a[�Ll�,REHS <br /> PAUL SUPPLE KITTY WALKER <br /> ATLANTIC RICHFIELD COMPANY COS REDEVELOPMENT AGENCY <br /> PO BOX 6549 305 N EL DORADO STREET <br /> MORAGA CA 94570 STOCKTON CA 95202 <br /> RE Former ARCO Station#4493 Site Code #1042 <br /> 205 N Center Street <br /> Stockton CA 95202 <br /> WORK PLAN Work Plan Addendum for Dual Completion Nforutonng Wells <br /> DATED I\lay 15,2003 <br /> PREPARED BY URS Group,Inc <br /> APPROVED rxl <br /> DISAPPR VED [ ] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299 31,subd(c)(3)] <br /> 1 Installation of one deep monitoring well for vertical assessment of the plume near onsite wells NP%'-4 and M'W-8 <br /> The boring for this well will be coni-muousl) cored from 56 feet bsg to total depth for hthologic interpretation and <br /> proper screen placement <br /> 2 Installation of one nested monitoring well for lateral and vertical assessment of the plume downgradient from the <br /> site <br /> COIENIENTS AND CONDITIONS <br /> I A revised"Table 2" from the 2/4/03 URS Well Installation Report was included in the work plan However,the <br /> Quarterly Groundwater Monitoring Report,First Quarter 2003 dated May 2003,that was submitted to SJC/EHD <br /> on the same day as the subject work plan contains the original,incorrect"Table 2" Please revise the table in this and <br /> all future reports of the site <br /> 2 Subrrut a San Joaquin County Well Permit application,along with the required$89 00 perrrut fee,for the deep onsite <br /> morutonng well <br /> 3 San Joaquin_Count) v ell permit#314'31 is still in effect for installation of the offsite nested well <br /> 4 Ensure all necessary City of Stockton encroachment and revocable permits are in place for installation of the offstte <br /> nested well <br /> 5 Ensure San Joaquin County Well Standards are adhered to during construction of the nested well A2-inch <br /> separation must be maintained between the well casings Development of newly installed well must occur no less <br /> than twelve hours after setting the grout <br /> 6 Forty-eight hours notice to SJC/EHD is required prior to all fieldwork <br /> Lon Duncan,Senior REHS Nuel C Henderson,Jr,R G <br /> LOP/Site l%litigation Unit IV LOP/Site Mitigation Unit n' <br /> cc VA<emon Elarth,URS <br /> Bill Brown,Daley&Heft <br /> James Barton,C%'R%VQCB <br />