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• Table 4 <br /> Design Basis Summary for In-Situ Treatment <br /> PARAMETER POINT OF COMPLIANCE <br /> Depth to groundwater 80 ft(maximum;well MW-8) <br /> Aquifer Thickness 25 ft(MW-9A observation) <br /> Hydraulic Gradient 0.0375 ft/ft(average) <br /> Porosity(estimated) 25%(maximum) <br /> Hydraulic Conductivity 0.012 ft/day(geomean) <br /> Length of Treatment 920 ft <br /> Depth to Bottom of Aquifer 105 ft(maximum; MW-9A observation) <br /> VOC Concentrations 22.52µg/L(MW-8,October 2012) <br /> 3.4 DESIGN PARAMETERS FOR EX-SITU TREATMENT <br /> Ex-situ treatment, commonly referred to as a conventional "Pump and Treat" process, <br /> removes groundwater from the affected aquifer by a series of extraction wells, which is <br /> conveyed through a treatment system to remove the contamination. Groundwater <br /> extraction systems are designed to hydraulically contain the off-site movement of <br /> contaminated groundwater from the site and reduce the concentrations of dissolved <br /> . contaminants to levels consistent with remediation standards established for ultimate <br /> restoration of the aquifer. The treated groundwater can be discharged to infiltration ponds, <br /> used for dust suppression, discharged to injection wells, or discharged to a sanitary sewer, if <br /> available. <br /> Ex-situ groundwater treatment technologies that were considered include: <br /> • Air-stripping <br /> • Biological treatment <br /> • Granular Activated Carbon (GAC) adsorption <br /> • Chemical oxidation <br /> • Above-ground Metal Enhanced Reductive Dehalogenation Reactor <br /> • Reverse Osmosis (RO)—for treatment of inorganic contaminants <br /> The general parameters to evaluate alternative ex-situ treatment options, in conjunction <br /> with available hydrogeologic and groundwater chemistry data, were used to define the <br /> configuration of viable mitigation technologies and provide a basis for developing <br /> performance and cost estimates to evaluate and rank the alternatives on the basis of <br /> technical and economical feasibility. <br /> Engineering Feasibility Study GeO-I.OIC Page ■ 12 <br /> Corral Hollow Sanitary Landfill ASSOCIATESS <br /> January 25,2013 <br />