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0 FMCOn Assoftates <br /> 1433 North Market Boulevard•Sacramento.Californic 95834,19q - 928-3300 928-3300. Fax(916)928-3341 <br /> �f'0 ; H AI_T11 <br /> SERVICE <br /> JU1_ 17 PM 1: 10 <br /> July 6, 1995 <br /> Project OC42-001.023 <br /> Ms. Gail Wiggett <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road Suite A <br /> Sacramento, California 95827 <br /> Re: Piezometer and Monitoring Well Decommissioning and Monitoring Well <br /> Replacement, Stockton Terminal Technical Committee Facilities, Port of Stockton <br /> Dear Ms. Wiggett: <br /> On behalf of the Stockton Terminals Technical Committee (STTC) EMCON is submitting <br /> this letter report of piezometer and monitoring well decommissioning activities and <br /> monitoring well replacement at the STTC distribution terminals at the Port of Stockton. <br /> Activities were conducted on May 15, 16, and 17, 1995. The scope of work was presented <br /> in the March 10, 1995, Workplan for Piezometer and Monitoring Well Decommissioning <br /> and Replacement of Monitoring Well Pair PS/WC-2s,m and included the following tasks: <br /> • Decommissioning 1-inch diameter piezometers <br /> • Decommissioning 4-inch diameter monitoring wells <br /> • Replacing well pair PS/WC-2s,m <br /> Prior to conducting decommissioning and well replacement activities, EMCON obtained <br /> applicable permits from the San Joaquin County Department of Environmental Health <br /> (SJCDEH). Details are presented in the following sections. <br /> PIEZOMETER DECOMMISSIONING ACTIVITIES <br /> Twenty one one-inch diameter piezometers with limited application to site monitoring and <br /> remediation were decommissioned. Piezometers P-1 through P-9 and P-14, P-16, and P-17 <br /> were decommissioned by drilling out the surface seal and casing to 10 feet below ground <br /> surface using 8-inch diameter hollow-stem auger drilling equipment and sealing the borings <br /> with cement grout containing 5 percent bentonite. Piezometers P-18 through P-20, P-22, <br /> P-24, P-25, P-27, and P-28 were decommissioned by pulling the surface seal and casing <br /> SA(.�N:V'JftC4Z\OC1420012.3 C1-95Wnp:1 <br />