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r ENVIRONMENTAL HEALTH DEPARTMENT <br /> opa ' SAN JOAQUIIN COUNTY Unit Supervisors <br /> -.0 <br /> c ?� Donna K Reran,R.E.Hs. 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.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> d:, :`a• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Qci Foar' Laurie A.Cotulla,R.E.H.S. Fax: (20 464-0138 <br /> Robert McClellon,R.E.H.S. <br /> 9) <br /> Program Manager nk�a [� ,R.E.H.S. <br /> ti �J i <br /> I <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 Monitoring Wells <br /> DATED: May 15,2003 <br /> PREPARED BY: URS Group,Inc. <br /> APPROVED: [x� <br /> DI APPROVED: l <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN {H&S 25299.37,subd(c)(3)1: <br /> 1. Installation of one deep monitoring well for vertical assessment sof the plume near onsite wells NiN6'-4 and!\1W.8. <br /> The boring for this well will be continuously cored from 56 feet!bsg to total depth for lithologic 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 /> COMMENTS AND CONDITIONS: <br /> 1. 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 2003Idated Nlay 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 /> long with the required$89.00 permit fee,for the deep onsite <br /> 2 Submit a San Joaquin County Well Permit application,a <br /> monitoring well. <br /> 3. San)oaquin County well permit#31631 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 offsite <br /> nested well. <br /> 5. Ensure San Joaquin County Well Standards are adhered to during construction of the nested well. A 2-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 fii ldwork_ <br /> Lori Duncan,Senior REHS Nuel C.Henderson,Jr.,R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: Vemon Elarth,URS <br /> Bill Brown,Daley&Heft <br /> James Barton,CVRWQCB <br />