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12 September 2003 AGE-NC Project No. 01-0865 Page 2 of 7 • Monitoring and maintenance; • Preparation of reports. Each of these tasks are discussed below in detail. 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site permits will be obtained from the San Joaquin County Public Works or State of California(i.e. sanitary sewer waste discharge,building, electrical, etc.)and from the San Joaquin County Environmental Health Department(EHD)(i.e.drilling/well installation permits).In addition, an update to the health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985).Priorto mobilization,all underground trenching areas will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. INSTALLATION OF REMEDIATION PUMPS Based on the results of the AGE-prepared Ground Water Extraction Feasibility Test Report, dated 24 July 2003, the use of the existing extraction well EW-1 should be adequate to address interim remediation efforts in the `core' area of the dissolved petroleum hydrocarbon plume; results of the capture zone analysis are illustrated in Figure 3. AGE will install a dedicated, 3.5-inch diameter air-driven(pneumatic) submersible pump (model AP-4/BL) inside the existing extraction well EW-1. The pump will be designed to operate continuously at low flow rates ranging between 0 and 10 gallons per minute (GPM) or more. This pump can work in conjunction with the available 1.75-inch diameter air-driven pumps which fit in 2-inch wells, enabling the expansion of the extraction system at a later date utilizing existing monitoring wells, if required. The pump will also adjust its pumping rate to match the wells individual recharge rate,thereby providing a continuous cone of depression.Additional information for the proposed submersible pumps are provided in Appendix B. 3.3. INSTALLATION OF INTERIM REMEDIATION SYSTEM PIPING NETWORK A remediation system piping network will be installed underground in a 1-foot wide by 1.5-foot deep trench; the proposed trenching location is depicted in Figure 4; a cross sectional view of the trench Advanced GeoEnvironmental,Inc.