SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

5.0 Comparison and Selection of Treatment Alternatives Four alternatives were identified and evaluated in Section 4.0 to assess their applicability to address the petroleum hydrocarbon contamination at the Transmission Shop site. As mentioned in Section 4.0, the alternatives were also ranked with the qualitative criteria—high, moderate, or low. Table 5-1 highlights the evaluation results for comparison among the alternatives. Table 5-1. Ranking and Comparison of Treatment Alternatives Alternative Technical Effectiveness Implementability Cost Overall Effectiveness(a) Ranking Groundwater Effective in reducing & Implementable but Expected to Moderate pump and treat bulk mass of COPCs in may take a long be high due to to Low gravelly,sandy soil layer time(more than six types of but limited in silty and months to a year equipment clayey soil layer; after completion of required and • May take a long time to system design) associated achieve target cleanup before treatment level of O&M goal; . begins due to air activities; • Overall effectiveness- and POTW Estimated moderate permitting ROM cost- requirements and $1.4 million; equipment fabrication; Overall cost effectiveness • May need a lot of -moderate to secured space for low equipment installation and operation; • Overall implementability- moderate to low Air sparging with Effective in reducing Implementable but Expected to Moderate SVE bulk mass of COPCs in may take a long be moderate gravelly,sandy soil layer time(more than six based on the but limited in silty and months to a year number of clayey soil layer; after completion of equipment • May take a long time to system design) anticipated achieve target cleanup before treatment and the goal; begins due to air associated • May require hydraulic and possible level of 0&M controls to prevent POTW permitting activities,but potential spreading of needs and could be high groundwater equipment if hydraulic contaminants; fabrication; control is • Overall needed; Overall effectiveness- moderate implementability- Estimated moderate ROM cost- $1.1 million Final FS_OnMe Petroleum HWrporbon Remedation 5-1 Shaw Environmental,Inc.