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• <br />171 <br />5.0 Comparison and Selection of Treatment Alternatives <br />Four alternatives were identified and evaluated in Section 4.0 to assess their applicability to <br />address the petroleum hydrocarbon contamination at the Transmission Shop site. As mentioned <br />in Section 4.0, the alternatives were also ranked with the qualitative criteria — high, moderate, or <br />low. Table 5-1 highlights the evaluation results for comparison among the alternatives. <br />Table 5.1. Ranking and Comparison of Treatment Alternatives <br />Alternative <br />Technical Effectiveness <br />Implementability <br />Cost <br />Effectiveness <br />Overall <br />Ranking <br />Groundwater <br />Effective in reducing <br />Implementable but <br />Expected to <br />Moderate <br />pump and treat <br />bulk mass of COPCs in <br />may take a long <br />be high due to <br />to Low <br />gravelly, sandy soil layer <br />time (more than six <br />types of <br />but limited in silty and <br />months to a year <br />equipment <br />clayey soil layer; <br />after completion of <br />required and <br />• May take a long time to <br />system design) <br />associated <br />achieve target cleanup <br />before treatment <br />level of ON <br />goal; <br />begins due to air <br />activities; <br />• Overall effectiveness — <br />and POTW <br />Overall cost <br />moderate <br />permitting <br />effectiveness <br />requirements and <br />— moderate to <br />equipment <br />low <br />fabrication; <br />• May need a lot of <br />secured space for <br />equipment <br />installation and <br />operation; <br />• Overall <br />implementability — <br />moderate to low <br />Air sparging with <br />Effective in reducing <br />Implementable but <br />Expected to <br />Moderate <br />SVE <br />bulk mass of COPCs in <br />may take a long <br />be moderate <br />gravelly, sandy soil layer <br />time (more than six <br />based on the <br />but limited in silty and <br />months to a year <br />number of <br />clayey soil layer; <br />after completion of <br />equipment <br />• May take a long time to <br />system design) <br />anticipated <br />achieve target cleanup <br />before treatment <br />and the <br />goal; <br />begins due to air <br />associated <br />• May require hydraulic <br />and possible <br />level of 0&M <br />controls to prevent <br />POTW permitting <br />activities, but <br />potential spreading of <br />needs and <br />could be high <br />groundwater <br />equipment <br />if hydraulic <br />contaminants; <br />fabrication; <br />control is <br />• Overall effectiveness — <br />• Overall <br />needed; <br />moderate <br />im lementabili <br />p tY — <br />Overall cost <br />moderate <br />effectiveness <br />— moderate <br />FS Onsite Petroleum Hydrocarbon Remediation.doc 5-1 Shaw Environmental, Inc. <br />