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Page 3 <br /> The pumping rate is regulated by the pump speed programmable from the CU300 module <br /> and also from the manual globe valve installed upstream of the system flow meter. <br /> Authorized representatives will adjust the pumping rate according to observed conditions. <br /> An in-line bag filter will remove any suspended solids present in the extracted water. <br /> The CU300 module will monitor the total run time for each pump. The run time will be <br /> accumulated on a non-resettable totalizer located in the CU300 module. The module will <br /> also regulate the dry run pump protection and will have an adjustable time preset for re- <br /> starting the pump after a run dry event. <br /> The flow rate of each pump will be monitored using ultrasonic flow meters, IFM Effector <br /> Model SU7001. The flow meters will display the instantaneous flow rate. The measured <br /> flow rate and the accumulated total flow will be displayed on the digital panel displays <br /> located at the main control station. On the discharge of the flow meter the system <br /> backpressure will be measured using analog pressure gauges. An above-ground sample <br /> port will be installed on the extracted water line. <br /> One new monitoring well, MW-13B, will be added to the network to provide information <br /> regarding the performance of the injection/extraction system. Monitoring well MW-13B <br /> will be located in direct line between the injection and extraction wells and will also be <br /> used to confirm the groundwater model constructed for this site. This well will also be <br /> screened within the 60 to 80 feet bgs depth consistent with other monitoring wells on site. <br /> 4. New Well Construction Specifications <br /> 4.1 Iniection Well Construction <br /> Two injection wells will be completed to a depth of 80 feet using hollow stem auger <br /> (HSA). The wells will be constructed of 6" schedule (sch) 80 polyvinyl chloride (PVC), <br /> with 20 foot 0.04-inch slotted screens between 60 feet and 80 feet bgs. Each of these <br /> wells shall have threaded caps and finished with 12" x 12" heavy duty, H-20 load rated <br /> flush mounted manholes (see Figure 3). Each well will be constructed through the auger <br /> and a filter pack will be placed as the auger is retracted. The sand filter pack will be <br /> placed in the screen interval to two feet above the well screen. Two feet of hydrated <br /> bentonite pellets will be placed above the filter pack and allowed to hydrate for a <br /> minimum of 30 minutes, and then the well will be finished to the surface with grout <br /> mixture. San Joaquin County Environmental Health Department (EHD) personnel will <br /> be on site during the well installation/grouting process. <br /> Soil samples will be collected at five-foot intervals using a split spoon sampler for <br /> lithologic determinations. <br /> 4.2 Extraction Well Construction <br /> Borings conducted for installation of extraction wells ( EW-11B and EW-12B) shall be <br /> conducted with HSA to install two (2) 85 ft deep wells that are constructed of 6" sch 80 <br /> PVC with 20 feet of 0.01" slotted screen between 60 and 80 feet bgs. There shall be 5 <br /> feet of sch 80 PVC below the screen to act as a sediment trap below the pump. The sand <br /> RACONTGRAN\CC14Cargill\French Camp\GW Recirculation Pilot Study Work Plan October 2007\Well Installation Work Plan-French Camp Grain <br /> Elevator 0125 OB.doc <br />