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{� e <br /> i <br /> are used rather than detailed eL nates in comparing costs. <br /> At this initial stage of the evaluation process, cost <br /> comparison is based on best available data and engineering <br /> judgement. <br /> 9.4.4 screening of Options for Detailed Analysis <br /> Presented below are the general response actions and <br /> corresponding remedial technologies selected based on the <br /> initial screening process for more detailed evaluation. <br /> In general, the no action, containment, and disposal <br /> response alternatives were not determined to be effective, <br /> applicable, or implementable with respect to remediation <br /> objectives and site-specific conditions. <br /> General Response Actions Remedial Technology Types <br /> Collection Interceptor Trenches <br /> Recovery Wells <br /> Treatment Air Stripping <br /> w <br /> Activated Carbon Adoorption <br /> Combined Air Stripping and <br /> Carbon Adsorption <br /> Biological Treatment <br /> Ultraviolet Light (UV)/ <br /> Hydrogen Peroxide (H2O2) <br /> Following the above screening process, the specific <br /> z technology alternatives found to be potentially applicable <br /> - for remediation of ground water at the site are collection <br /> of water using trenches or drains and/or recovery wells <br /> with onsite treatment using air stripping, activated carbon <br /> adsorption, biological treatment, UV/H2O2 treatment, or any <br /> combinations thereof. <br /> A short description of each remedial technology is <br /> presented below. . <br /> e Trenches QOd Drains <br /> Interceptor trenches and drains are used to recover <br /> liquid- or immiscible--phase hydrocarbons above a <br /> -- --shallow-water--table-or-a_perching- barrier of low - - - <br /> hydraulic conductivity. Trenches or drains are <br /> excavated downgradient of the free liquid <br /> 21 <br />