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t Advanced GeoEnvironmental, Inc - 01 December 2004 AGE-NC Project No. 97-0351 Mr. Harlin Knoll San Joaquin County Environmental Health Department 6 304 East Weber Avenue, Third Floor Stockton, California 95202 Subject: Monitoring Well Abandonment Work Plan FIVE STAR MARINA 345 Yosemite Street, Stockton, California Dear Mr. Knoll: On behalf of Mr.Terry McDonald,Advanced GeoEnvironmental,Inc.has prepared this Monitoring Well Abandonment Work Plan for the destruction of temporary well MW-UST at Five Star Marina located at 345 Yosemite Street,Stockton,California(Figure 1).The status of the temporary well was brought to AGE's attention by San Joaquin County Environmental Health Department (EHD) personnel during quarterly monitoring field work on 22 October 2004. Temporary well MW-UST (Figure 2) will be abandoned by over-drilling to total depth of the well utilizing a truck-mounted drill rig equipped with 8.25-inch hollow stem augers and backfilling with portland cement.The boring will be backfilled to surface grade using Type UII portland neat cement and not more than 6 gallons of water per 94-pound sack of cement. The well box will be removed, and the remaining space will be filled to surface grade with cement or concrete. All down-hole drilling equipment will be pressure washed prior to starting each boring. Cuttings and rinseate generated during drilling activities will be containerized in properly labeled DOT-approved 55- gallon drums, and stored on-site in an area lacking public access. EHD will be notified at least 48-hours prior to conducting well abandonment activities. In addition, following completion of the field activities, EHD will be supplied with a letter detailing the abandonment procedures. 837 Shaw Road,Stockton, California 95215 Telephone(209)467-1006 FAX(209)467-1118