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r - <br /> t,; sem-- ;r <br /> r <br /> n.. - <br /> Nr <br /> that hydraulic control is established and maintained. if <br /> '°A plume containment cannot be accomplished utilizing well, MW-4 <br /> alone, then another of the existing wells or a now well will <br /> be also used for pumping. <br /> 3.4 Groundwater Treatment <br /> Extracted groundwater can be treated on-site by carbon <br /> adsorption or air stripping. Based on the anticipated low <br /> flow rate and hydrocarbon concentration, carbon adsorption <br /> has been selected as the treatment method for this site. <br /> K4 <br /> Carbon adsorption is a process used to remove contaminants <br /> from water by Using activated carbon to adsorb the <br /> contaminant constituents. Advantages of carbon absorption <br /> are effectiveness, low cost, regeneration capability, <br /> dependability and operational simplicity. Contamination is <br /> commonly removed to non-detectable levels, producing treated <br /> r water of quality that meets or exceeds state drinking water <br /> standards. because the contamination is adsorbed and not <br /> vented, an air discharge permit will not be required. <br /> The proposed groundwater treatment system consists of a sand <br /> filter to remove any sediment, two-200 pound carbon filters <br /> �. plumbed in series and a chemical mixing tank with injection <br /> Pump. The chemical mixing tank and pump will be used to mix <br /> a solution of hydrogen peroxide and treated water for <br /> injection into treated waste water stresm. This will be <br /> done to increase the oxygen content of the water prior to <br /> reinjection. The increased oxygen in the water will help <br /> naturally occurring, hydrocarbon-utilizing bacteria breaking <br /> down the hydrocarbon contamination. <br /> 3.5 Treated Water Disposal <br /> Typical methods of treated water disposal include <br /> �.. reinjection of the water, discharge to a sanitary sewer or <br /> discharge to a surface drainage system. <br /> Groundwater reinjection has been selected as the water <br /> disposal method for this project. WaterWork proposes <br /> reinjection of the treated oxygenated water into upgradient <br /> well. AoV-5. The reinjection of the water in well MW-5 will <br /> help establish hydraulic control by creating an upgradient <br /> mound to drive the water toward the pumping well. <br /> Additional wells may be added after the effectiveness of <br /> -- reinjection has been evaluated. <br /> 3.6 Permitting Requirements <br /> Discharge of treated groundwater to the reinjection well <br /> will require waste discharge requirements or a waiver from <br /> the Central Valley Regional Water Quality Control Board <br /> 4 <br />