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tai t- 15 June 2004 AGE-NC Project No 95-0142 Page 5 of 12 2 2 4 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 A '/z-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 electncal control panel was installed adjacent the process tank and pump Electrical wiring from the ground water extraction pumps, process pump and holding tank float controls were connected to the electrical control panel Pump controls are supplied by a pressurized air line for the pump controls From the process pump, 1-inch diameter PVC tubing(schedule 40)was routed to a 5-gallon suspended solids filter chamber equipped with 25-micron replaceable blown-fabric sediment filter bags From the filter chamber, schedule 40 PVC tubing was routed to the two 2,000 pound vessels containing GAC The GAC media vessels are designed to adsorb hydrocarbons compounds Brass sampling ports were installed at the influent,between the media vessels and at the effluent to allow sampling for detection of potential media break through and to obtain final discharge samples The ground water pump and treat system layout is depicted in Figures 3 A battery operated, F-2000 (model RT) Blue-White Industries flow meter was installed on the effluent line to continuously measure and display the effluent flow rate and to continuously measure and display the total flow The flow meter is designed to operate between 6 and 20 gallons per minute A Lower Explosive Level(LEL)meter was installed on the ground water effluent at the site The ground water treatment system is enclosed within a chain-link fence on the east side of the site • Advanced GeoEnvironmental,Inc