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#� �� SECORti� www.secor.com INTERNATIONAL 3017 Kilgore Road,Suite 100 S E C 0 R INCORPORATED Rancho Cordova,CA 95670 916-861-0400 TEL 916-861-0430 FAX October 23, 2006 Ms. Victoria McCartney L t, [ 2 5 2006 Senior REHS San Joaquin County IVIFcCI (,ll l`iT HEALTH Environmental Health Department PSMIT/SERVICES 304 East Weber Avenue, Third Floor J Stockton, California 95202.2708 -r Re: Revised Work Plan for Well Destruction 4P� ARCO Station 5450 t Or 1617 West Fremont Street, Stockton, California Dear Ms. McCartney: This revised work plan is prepared by SECQR International Incorporated (SECOR) on behalf of Atlantic Richfield Company, a BP Affiliated Company (BP). This revised work plan outlines the destruction of the monitoring wells at ARCO Station 5450 located at 1617 Freemont Avenue in Stockton, California (Figure 1). The well destructions are being completed to obtain a "No Further Action" designation for the site, per your June 6, 2006 and September 18, 2006 letters (Attachment A). This Revised Work Plan includes a brief discussion of the proposed destruction of monitoring wells MW-2, MW-3 and MW-4. In addition, as requested a copy of the certified list of record fee title owners is included in Attachment B. WELL CONSTRUCTION DETAILS The wells proposed for destruction at the subject site are monitoring wells MW-2, MW-3 and MW-4. These monitoring wells are constructed of schedule 40 PVC casing installed to total depths of approximately 26 feet below ground surface (bgs). The well construction details are outlined in Table 1. Each well includes a well box set in concrete and constructed flush with the existing ground surface. The well logs are included in Attachment C. WELL DESTRUCTION Health and Safety — Prior to conducting the well destructions, a site specific Health and Safety Plan (HASP) will be prepared for use by personnel during the implementation of this work plan. The HASP will address the proposed activities and a copy will be available onsite during field work. Subcontractors performing field activities will also be provided a copy of the HASP prior to initiating work. Permitting - Well destruction permits and associated fees will be submitted by the contractor executing the field activities.