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7 <br /> G <br /> 5.0 Comparison and Selection of Treatment Alternatives rr <br /> U <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 Technical Effectiveness Implementability Cost Overall <br /> Effectiveness Ranking <br /> Groundwater Effective in reducing Implementable but Expected to Moderate <br /> pump and treat bulk mass of COPCs in may take a long be high due to to Low <br /> gravelly,sandy soil layer time(more than six types of <br /> but limited in silty and months to a year equipment <br /> clayey soil layer; after completion of required and <br /> • May take a long time to system design) associated <br /> achieve target cleanup before treatment level of 0&M <br /> goal; begins due to air activities; <br /> Overall effectiveness- and POTW Overall cost <br /> • permitting effectiveness <br /> moderate requirements and -moderate to <br /> equipment 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 Effective in reducing Implementable but Expected to Moderate <br /> SVE bulk mass of COPCs in may take a long be moderate <br /> gravelly,sandy soil layer time(more than six based on the <br /> but limited in silty and months to a year number of <br /> clayey soil layer; after completion of equipment <br /> • May take a long time to system design) anticipated <br /> achieve target cleanup before treatment and the <br /> goal; begins due to air associated <br /> May require hydraulic and possible level of 0&M <br /> • controls to prevent POTW permitting activities, but <br /> potential spreading of needs and could be high <br /> groundwater equipment if hydraulic <br /> contaminants; fabrication; control is <br /> • Overall needed; <br /> • Overall effectiveness- implementability- Overall cost <br /> moderate moderate effectiveness <br /> -moderate <br /> FS_OnVe Petroleum Hydrocarbon Remediation.doc 5-1 Shaw Environmental, Inc. <br />