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March 10, 1995 <br /> Project OC42-001.23 <br /> Mr. Greg Vaughn FILE C0PY <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Re: Workplan for Piezometer and Monitoring Well Decommissioning and Replacement <br /> of Monitoring Well Pair PS,1VC-2s,m, Stockton Terminal Technical Committee <br /> Facilities, Port of Stockton <br /> Dear Mr. Vaughn: <br /> On behalf of the Stockton Terminais Technical Committee (STTC), EMCON is submitting <br /> this workplan for decommissioning 20 groundwater piezometers and 2 groundwater <br /> monitoring wells and replacing monitoring well pair PS/WC-2s,m at the STTC Facilities, <br /> Port of Stockton. The scope of work is summarized below: <br /> • Task I - Prefield Activities, Permitting, and Scheduling <br /> • Task 2 - Piezometer Decommissioning <br /> • Task 3 - Decommissionine Two Monitoring Wells <br /> • Task 4 - Repairing Well Pair PS/WC-2s,m <br /> • Task 5 - Reporting <br /> The rationale for proposed decommissioning activities is listed on Table 1. Locations of <br /> piezometers and wells proposed for decommissioning are shown on Figure 1. A detailed <br /> description of the tasks is presented below. <br /> Task 1 Prefield Activities <br /> Prior to conducting field activities, EMCON will obtain piezometer and well <br /> decommissioning permits from the San Joaquin County Public Health Department <br /> (SJCPHD). Subcontractors and materials will also be scheduled and EMCON will contact <br /> the Port of Stockton regarding field activities. <br /> Task 2 Piezometer Decommissioning <br /> Woodward Clyde installed a total of 32 1-inch-diameter piezometers in 1987. Two <br /> piezometers were decommissioned in 1992. Of the 30 remaining piezometers, 6 are <br /> damaged and inaccessible. The piezometers are used primarily for water level <br /> SA('\N:WJM('42\LC420012.3AL-94Vfc:2 <br />