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y <br /> C� <br /> 202 Val Derwin Parkway, Suite 400, Stockton, CA 95206 <br /> • Telephone: 209.983.6810 Facsimile: 209.983.6960 <br /> CONESTOGA-ROVERS www.CRAworld.com <br /> & ASSOCIATES <br /> July 14 2004 Ref. No. 000197-63 <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton, CA 95202-2708 <br /> Dear Mr. Knoll: <br /> Re: Monitoring Well Replacement Work Plan <br /> Lathrop Groundwater Remedial Program <br /> 16777 Howland Road,Lathrop, CA <br /> Conestoga-Rovers &Associates (CRA), on behalf of Miller Springs Holding Company,has <br /> prepared this Monitoring Well Replacement Work Plan for the replacement of three existing <br /> monitoring wells that constitute a portion of the sixty-two monitoring well network that <br /> services the Lathrop Groundwater Remedial Program (Program). The area of the Program is <br /> located in and around Lathrop,California (Site). The Site location is shown on Figure 1. This <br /> Work Plan is being submitted in accordance with San Joaquin County Environmental Health <br /> Department(EHD) Well Permit Application form. <br /> 1.0 BACKGROUND <br /> The Program became operational in June 1982. The Program was initiated in response to the <br /> reported impact of fumigant pesticides (DBCP and EDB) residues to area grotundwater. <br /> Currently approximately 800,000 gpd of impacted groundwater is extracted by seven extraction <br /> wells screened in three separate upper aquifer zones, the influent is treated by granular <br /> activated carbon, and the treated effluent is injected back into a deep confined aquifer. <br /> Sixty-two GW monitoring wells were initially installed for the purpose of evaluating the <br /> effectiveness of the Program. The existing wells (constructed in clusters of three) consist of 6- <br /> inch carbon steel casings screened at various depths within each of the three upper aquifer <br /> zones. Periodically during the history of the Program some of the wells have become obsolete <br /> (deterioration/non-serviceable) and have been replaced. At this time three monitoring wells <br /> (PW2-80,PW10-83,and PW10-138) need replacement(see Figure 1). <br /> 2.0 SCOPE OF WORK <br /> The following sections present the scope of work(SOW) to be performed during the monitoring <br /> well replacement activities at the Site. The SOW will be implemented tinder the direct <br /> Worldwide Engineering,Environmental,Construction,and IT Services <br />