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Alternative Technical Effectiveness Implementability CostOverall Effectiveness Ranking Biosparging Effective in reducing • Easily • Expected to bulk mass of COPCs in implementable; be moderate High gravelly,sandy soil layer Should take no based on the but limited in silty and more than six expected level clayey soil layer; months after of 0&M • May take a long time to completion of pilot activities; achieve target cleanup test and system • Overall cost goal; design to begin effectiveness • Overall effectiveness- treatment; - high moderate • No air or POTW permits needed, minimizing lead time required; • Overall implementability- high In-situ chemical Effective in reducing • Implementable but Expected to oxidation bulk mass of COPCs in require a field pilot be high due to Moderate to high gravelly,sandy soil layer test to complete amount of but somewhat limited in system design; oxidant likely silty and clayey soil • Should take no used and the layer; more than six need to • May not take as long a months after address the time as the other completion of pilot COPC in the alternatives to achieve test and system silty and target cleanup goal; design to begin clayey soil • Overall effectiveness- treatment; layer,along moderate to high Fewer permits with the needed than associated groundwater pump level of 0&M and treat and air activities; sparging with SVE Overall cost -less lead time effectiveness before treatment -moderate begins; • May require additional system control measures depending on permit requirements; • Overall implementability- moderate to high Based on the results of the comparison among the alternatives on technical effectiveness, implementability, and` cost effectiveness, biosparging should be the preferred treatment alternative for the site. FS_OnsRe Petroleum Hydrocarbon Remediation.doc 5_2 Shaw Environmental, Inc.