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hydrocarbons, activated carbon adsorption was selected as the water <br /> treatment methodology. <br /> 6.2 Systelu Components <br /> The remediation system will cinsist of four major functional <br /> components. These are, (1) groundwater extraction, (2) fluid <br /> conveyance, (3) fluid treatment, and (4) treated fluid discharge. <br /> The groundwater extraction °unction is accomplished by the recovery <br /> wells, submersible pumps and associated controls. Two additional <br /> recovery wells will be installed as shown on the remediation system <br /> plan (Figure 10). These wells will be constructed with 4 inch flush <br /> threaded PVC screen and casing as shown on Figure 11. <br /> A four inch stainless steel submersible pump will be set in both of <br /> the recovery wells. The pump will be environmentally compatible and <br /> equipped with a .5 horsepower, 3 phase, 480 volt motor. The control <br /> wiring will be run to the control panel within the treatment compound <br /> in below grade industrial conduit. It is anticipated that a total <br /> - system extraction rate of 5-10 gallons per missute will be <br /> sustainable. <br /> __. The extracted groundwater will be conveyed below grade within 4 inch <br /> schedule 80 PVC piping from the recovery wells to the treatment <br /> ' compound and from the compound to the discharge point. <br /> The hydrocarbon impacted groundwater extracted from the recovery <br /> wells will be treated by activated carbon filtration within the"on- <br /> site treatment compound. The t.reatmeat compound will consist of a 12 <br /> ft by 22 ft concrete slab enclosed by galvanized fencing. Tho <br /> enclosed compound will house the system electrical panel, the pump <br /> control panels, the two 2000 lb activated carbon filters, and all <br /> associated system monitoring components including sampling sorts, <br /> flow meter, flow control valving and pressure gauges. A portion of <br /> the compound will be occupied by the vapor extraction system <br /> equipment. <br /> 'he treatment process will consist of two carbon filters plumbed in <br /> series and preceded by a galvanized settling tank to trap any <br /> -- entrained sediment. Sampling ports will be installed before, between <br /> and after the filtration units. Water leaving the carbon filters <br /> will be aerated with clean compresses air prior to discharge. <br /> After treatment and aeratior the water will be conveyed to the <br /> discharge point by subgrade 4 inch piping. If injection of the fluid <br /> into upgradient well MW5 is permitted the discharge line will be <br /> routed as shown on Figure 10. If discharge to the City sewer system <br /> is selected for implementation the tie-in location will be specified <br /> ---- ----- ------by-the--appropriate---local agency.-------- <br /> Weber Point Property - 475 1 <br /> 1t2ORhP791.TLP <br />