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1uhAC'{a5 OESCNEp5 CCN5uLiu115 <br /> SECTION 4.0 <br />' FEASIBILITY STUDY <br /> A feasibility study was conducted to identify and evaluate potentially feasible technology options <br /> and then develop and evaluate alternatives for groundwater remediation. Several technologies <br />' were evaluated The list of technologies was then reduced to those that were felt to be <br /> technically feasible at the site given site specific conditions and use. Using these technologies, <br /> alternatives were developed that could potentially be implemented at the site. These alternatives <br /> were then evaluated based on implementability, effectiveness and cost. <br /> 4.1 TECHNOLOGY IDENTIFICATION AND SCREENING <br /> 1 <br /> 4.1.1 Technology Identification <br /> 1 A review of the most promising technologies was completed using EPA databases, vendor <br /> information and other sources This review identified the following technologies as showing <br />' some effectiveness for BTEX and TPH-G and as having some applicability considering site <br /> conditions <br /> Exsitu Pump and Treat <br /> • Insitu Air Sparging/Vapor Extraction <br />' • Physical Containment <br /> • Insitu Oxidation <br /> • Intrinsic Remediation/Monitonng <br /> 4.1.2 Technology Screening <br />' Fxsitu Pump and Treat <br /> Description This technology consists of installing a series of extraction wells in the groundwater <br /> plume Water is withdrawn from the wells and treated aboveground to remove the BTEX <br /> contamination The treated water would then be discharged into the sanitary sewer for treatment <br /> at the local pubIically owned treatment works (POTW) system. Groundwater extraction flushes <br /> and enhances dissolution of the BTEX from soil particles which in turn removes contaminants <br /> and enhances groundwater quality <br /> Evaluation Groundwater extraction and treatment (pump and treat) was found to not be viable, <br /> due to the long cleanup times involved which would result in high operation and maintenance <br /> costs, and the necessity for discharging the treated water into the City of Stockton's sanitary <br /> Isewer system Approximately 110,000 gallons of water per day would have too great an impact <br /> LTROJ ECCS\5AN10Q111SA4ACCION PL 30 <br />