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fi - ,"•—r— t ! 1-.x-n.>e; ;!n>ud..u.��-i�---+�.= Site Background Information Former Stockton Plating Facility Page 7 of 7 the ground water extraction pumps, process pump and holding tank float controls were connected I to the electrical control panel Pump controls are supplied by a pressurized air line for the pump controls From the process pump, I-inch diameter PVC tubing(schedule 40)was routed to a 5-gallon ' suspended solids filter chamber equipped with 25-micron replaceable blown-fabnc sediment filter J't'4 4 41 bags From the filter chamber, schedule 40 PVC tubing was `routed to the two 2,000 pound vessels I containing GAC The GAC media vessels are designed to adsorb hydrocarbons compounds Brass ' i x 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 r G A battery operated, F-2000 (model RT) Blue-White Industnes flaw meter was installed'on the effluent line to continuously measure and display the effluent flow rate and to continuously measure 7 ' r 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` 1 ' A dedicated,2-inch diameter PVC discharge pipeline was constructed from the treatment system to fi a sewer drain located at the eastern edge of the site Waste water is discharged to the City of Stockton`sewer system under permit The discharge piping system layout is depicted in Figure 3 , I , + I r _ a J � ' e n ' � 1 I J ' Advanced GcoEnvironmental,Inc t � ,