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i I21 May 2003 AGE-NC Protect No 95-0130 Page 15 of 16 4 5 1 Ground Water Extraction A Grundfos Rediflow down-well pump, type 5E5, equipped with Franklin 112 hp, 230V, 3-wire motors will be installed in wells EW-1 and EW-2 One-inch diameter Schedule 80 PVC pipe will be installed from the submersible pump and discharged through the well-head samtary seal,a safety chain will be installed at the sanitary seal to prevent dropping the pump to the well bottom To I minimize sediment intake through the pump, the bottom of the pump/motor assembly will be suspended approximately one foot from the bottom of the well Electrical wiring will be connected from the top of the pump through Class I electrical connectors/unction boxes and electrical conduit to the pump electric controller Ground water will be continuously pumped from the bottom of the six-inch diameter extraction wells EW-1 and EW-2 at low-flow rates between five and ten GPM and routed through underground PVC piping to a 1,000-gallon holding tank I 4 5 2 Extraction Well And Process Pump Controllers I Both the submersible Grundfosum s at EW-1 and EW-2 and the ground water pump-and-treat p p process pump will be controlled by PumpTec controllers The ground water extraction pump will Ioperate independently on a separate controller, with an amperage sensing/time switch which will detect any decrease in amperage when water level drops below the impeller intake from the Grundfos ' pump The pump also will be outfitted with automated electronic shut-off controls to control water entering the treatment unit AGE anticipates total ground water extraction flow between 10 and 20 GPM The process pump, located behind the holding tank (Figure 8), will be controlled by electrode switches placed at various levels in the holding tank An emergency shut-off switch will be located I immediately below the top of the holding tank An intermediate pump-on switch will be placed approximately 8-inches below the emergency shut-off switch and activate the process pump Intermediate pump-off switches will be utilized near the bottom of the holding tank to turn the process pump off Electricity is readily available to the site A dedicated electrical meter will be installed by representatives of P G & E that will connect directly to the pump and treat system 4 5 3 Ground Water Extraction Start-Up Period During the pump and treat start-up period(first two weeks of operation), ground water influent and effluent of the treatment system, depth to ground water measurements and operational parameters (ground water flow meters, fluid level sensors,total flow indicators)will be monitored daily during Advanced GeoEnvwronmental,Inc