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12 August 2002 <br /> . AGE-NC Project No 95-0103 <br /> Page 4 of 11 <br /> pumped from the recovery wells is Initially routed via the piping system to the 1,000-gallon poly <br /> ' tank (holding tank)prior to processing The holding tank is equipped with various water level float <br /> controls to control the rate at which extracted water is introduced Into the treatment vessels,to allow <br /> ' coarser sediment to settle out prior to treatment and to provide safety shutoff capabilities A high <br /> 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 1-horsepower, 230-volt, single-phase centrifugal process pump was installed after the holding <br /> tank The process pump is designed to process ground water through the treatment system at a <br /> maximum flow rate of 20 gallons per minute(GPM) <br /> ' An electrical control panel was Installed adjacent the process pump Electrical wiring from the <br /> ground water extraction pumps,process pump and holding tank float controls were connected to the <br /> electrical control panel Electrical PumpTec controller boxes were installed in the electrical control <br /> ' panel for individual control measures of extraction well pumps and the process pump Pump controls <br /> are supplied by an amperage sensing/time control switch This switch will detect any decrease in <br /> amperage when water level drops below the impeller intake from any of the Grundfos pumps <br /> ' From'the process pump,2-inch diameter PVC pipe(schedule 40)was routed to a 5-gallon suspended <br /> solids filter chamber equipped with 25-micron replaceable blown-fabric sediment filter bags From <br /> ' the filter chamber, schedule 40 PVC piping was routed to the three 2 ,000 pound vessels containing <br /> granular activated carbon(GAC) The GAC media vessels are designed to adsorb TPH-g and BTEX <br /> compounds Brass sampling ports were installed at the influent, between the media vessels and at <br /> ' the effluent to allow detection of potential media break through and to obtain final discharge <br /> samples The ground water pump and treat system layout is depicted in Figures 3 <br /> ' A battery operated, F-2000 (model RT) Blue-White Industries 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 60 gallons per <br /> ' minute <br /> An electrical control panel was Installed adjacent the process pump Electrical wiring from the <br /> ' ground water extraction pumps,process pump and holding tank float controls were connected to the <br /> electrical control panel Electrical PumpTec controller boxes were installed in the electrical control <br /> panel for individual control measures of extraction well pumps and the process pump Pump controls <br /> ' are supplied by an amperage sensing/time control switch This switch will detect any decrease in <br /> amperage when water level drops below the impeller intake from any of the Gnmdfos pumps <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />