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Site Background Information Former Stockton Plating Facility <br />' Page 7 of 7 <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 /> 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 /> iA 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 20 gallons per <br /> minute A Lower 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 east side of the site <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 /> 1 <br /> ' Advanced GeoEnviranmental,Inc <br />