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' Site Background Information Former Stockton Plating Facility • Page 6 of 7 GROUND WATER EXTRACTION SYSTEM INSTALLATION ' Four 1 5-inch diameter, stainless steel QED Environmental model H23 SET pneumatic powered, down-well pumps were installed in vapor extraction wells VW-1, VW-2, VW-3 and VW-4 The ' pumps were internally equipped with a one-way check valve to prevent back-flow The pumps were installed in each well at a depth of approximately 45 feet bsg One-half inch diameter poly-vinyl chloride (PVC) tubing was routed from each pump to the top of each well casing and through a 2- inch diameter sanitary well seal In the remediation area, a manifold was created with independent flow meters and a dedicated sampling port to allow sampling of each well Independently without having to remove each respective well head assembly On 02 February 2004, a 4-Inch diameter, stainless steel model 5S8 Grundfos Rediflow down-well pump equipped with 230 volt 1/z-horsepower 3-wire motors were installed in ground water extraction well EW-1 The Grundfos pump was installed in well EW-1 at a depth of approximately 65 feet below surface grade (bsg) Schedule 40, 1-inch diameter PVC tubing was routed from the pump to the top of the well casing and through a 4-inch diameter sanitary well seal In the remediation area, ' an independent flow meter and a sampling port was installed to allow sampling of the well without having to remove the well head assembly � i Installation of Ground Water Treatment System Three 2,000-gallon granular active carbon(GAC)media vessels,one 300-gallon poly tank(holding tank), one process pump and one sediment filter chamber were installed for the ground water treatment system Ground water pumped from the recovery wells is initially routed via the piping system to the 300- gallon poly tank(holding tank)prior to processing The holding tank is equipped with various water level float controls to control the rate at which extracted water is introduced into the treatment vessels, to allow coarser sediment to settle out prior to treatment and to provide safety shutoff ' capabilities A high float(high-high)was installed near the top of the holding tank and is designed to shut the entire system down if water level exceeds the high-high float A middle float (high- low)was Installed near the middle of the holding tank and is designed to turn on the process pump when water level exceeds the high-low float A low float was installed near the bottom of the holding tank(low-low) and is designed to turn off the process pump 1 A V2-horsepower, single-phase centrifugal process pump was installed inside the holding tank The process pump is designed to process ground water through the treatment system at a maximum flow rate of 10 gallons per minute (GPM) An electrical control panel was installed adjacent the process tank and pump Electrical wiring from ' Advanced GcoEnvironmental,Inc