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15 April 2004 <br /> . AGE-NC Project No 99-0559 <br /> Page 7 of 13 <br /> poly tank(holding tank) prior to processing The holding tank is equipped with various water level <br /> float controls to control the rate at which extracted water is introduced Into the treatment vessels, to <br /> allow coarser sediment to settle out prior to treatment and to provide safety shutoff capabilities A <br /> high float(high-high)was installed near the top of the holding tank and Is designed to shut the entire <br /> system down If water level exceeds the high-high float A middle float(high-low)was installed near <br /> the middle of the holding tank and Is designed to turn on the process pump when water level exceeds <br /> the high-low float A low float was installed near the bottom of the holding tank (low-low) and Is <br /> designed to turn off the process pump <br /> A %z-horsepower, single-phase centrifugal process pump was installed Inside the holding tank The <br />` process pump Is designed to process ground water through the treatment system at a maximum flow <br /> rate of 10 gallons per minute (GPM) <br />` An electrical control panel was Installed adjacent the process tank and pump Electrical wlnng from <br /> the ground water extraction pumps, process pump and holding tank float controls were connected <br /> to the electrical control panel Plump controls are supplied by a pressurized air line for the pump <br /> controls <br /> From the process pump, 1-inch diameter PVC pipe (schedule 40) was routed to a 5-gallon <br /> suspended-solids filter chamber equipped with 25-micron replaceable,blown-fabric sediment filter <br /> bags From the filter chamber, the water was routed to the four 1,000-pound vessels containing <br /> granular activated carbon(GAC} The GAC media vessels are designed to adsorb TPH-g and BTEX <br /> compounds <br /> Brass sampling ports were Installed at the Influent,between the media vessels and at the effluent to <br /> allow detection of potential media break through and to obtain final discharge samples A battery <br /> operated,F-2000(model RT) Blue-White Industries flow meter was Installed on the effluent line to <br /> continuously measure and display the effluent flow rate and to continuously measure and display the <br /> total flow The flow meter Is designed to operate between 6 and 20 gallons per minute An Lower <br /> Explosive Level (LEL) meter was installed on the ground water effluent at the site <br /> The ground water treatment system Is enclosed within a chain-link fence on the southeast side of the <br /> site, secondary containment consists of a 6-inch high concrete wall surrounding the treatment <br /> system <br /> Advanced GcoEnvironmental.Inc <br />