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I � <br /> x <br />' Installation of Ground Water Treatment System <br /> ira� If <br /> Three 2,000-gallon granular active carbon(GAC)media vessels,one 300-gallon po' ly tank(holding, <br /> tank), one process pump and one sediment filter chamber were installed for the ground water <br /> treatment system a . <br />�TJ v <br /> Ground water pumped from the recovery wells is initially routed via the piping system to the 300- <br /> gallon poly tank(holding tank)prior to processing The holding tank is,equipped with various water <br />' level float controls to control the rate at which extracted water'is introduced into the treatment <br /> M vessels, to allow coarser sediment to settle but prior to treatment and to provide safety shutoff <br /> capabilities A high float (high-high)was installed near the top of the'holdmg tank and is designed <br />' to shut the entire system down if water level exceeds the high-high float A middle float (high- r - <br /> low)was installed near the middle of the holding tank and is designed to turn on the process pump <br /> when water level exceeds the high-low float A low float was installed near the bottom of the holding <br /> tank (low-low) and is designed to turn off the process pump <br /> 1 _ <br /> A %2—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 /> i <br />' An electrical control panel was installed adjacent the process tank and pump Electrical wiring from <br /> the ground water extraction pumps, process pump and holding tank float controls were connected , <br /> to the electrical control panel Pump controls are supplied by a pressurized air line for the pump <br />' controls From the process pump, l-inch diameter PVC tubing(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, schedule 40 PVC tubing was routed to the two 2,000 pound vessels <br /> 1;, containing GAC The GAC media vessels are designed to adsorb,hydrocarbons compounds Brass <br /> sampling ports were installed at the influent,between the media vessels and at the effluent to allow <br /> sampling for detection of potential media break through and to obtain final discharge samples The <br />! ground water pump and treat system layout is depicted in Figures 3 <br /> A battery operated, F-2000 (model RT) Blue-White-4ndustries flow meter was installed on the { <br /> effluent line to continuously measure and display,the effluent flow rate and'to continuously measure <br /> and display,the total flow ,The flow meter is designed to,operate between '6 and 20 gallons per <br />' minute' A Lower Explosive Level(LEL)meter was installed on the ground water effluent at the site u , <br /> The ground water treatment system is enclosed within a chain-link fence on the east side of the site <br /> > I i <br /> I <br /> A dedicated, 2-inch diameter PVC discharge pipeline was constructed from the treatment system to ' <br /> a sewer drain located at the,eastern edge of the site 'Waste water is discharged to the City of <br /> Stockton sewer system under permit The discharge piping system layout is depicted in Figure 3 <br /> 5 Y } { H <br /> ' 1 I <br /> s N I r e <br /> r i <br /> r s ' <br /> I ; <br /> 1 I <br />