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Table 4-1 Evaluation of Remediation Options Option A-Intrinsic Bioremediation Option B-Pumping and Aboveground Criteria Demonstration with ASISVE Treatment with ASISVE Overall Protection of Human Health j and the Environment • Contact with contaminated No potential for contact with shallow Contact could occur in the event of a groundwater groundwater has been identified. treatment system leak,spill,or failure. • Migration of gasoline The currently operating AS/SVE system The currently operating AS/SVE system constituents from soil to component of Option A is removing NAPL component of Option B is removing.NAPL groundwater from the soil/groundwater interface as well as from the soil/groundwater interface as well as residuals in the vadose zone. residuals in the vadose zone. • Migration of gasoline Groundwater flow,and thus contaminant Migration is controlled by the inward gradient i constituents with groundwater � migration,is naturally limited by the created by groundwater pumping. confining formation. Natural biodegradation at the perimeter will provide further confinement. . • Contact with contaminated Direct contact with contaminated soil or.soil Direct contact with contaminated soil or soil soil or soil vapor vapor is not a potential risk due to thadepth to vapor is not a potential risk due to the depth to fuel constituents. fuel constituents. I. Reduction of Toxicity,Mobility, Produces geochemical data that will document Provides slightly greater contaminant mass Contaminant Mass or Volume mass removal rates and contaminant fate i removal(0.12 lb/day)through groundwater mechanisms and identify rate limiting stripping. Reduces mobility by creating an { processes. inward gradient. Short-Term and Long-Term No potential for exposure during Some potential for human exposure during (i Effectiveness implementation. Demonstrates short-term implementation. Only demonstrates longer- evidence of degradation/remediation processes term contaminant concentration reductions. as well as longer-term contaminant Time to achieve complete remediation is concentration reduction. Time to achieve expected to be greater than 30 years. complete remediation goals is expected to be greater than 30 years. Implementation • Construction and operation No additional construction or equipment Requires installation of pumping wells, needed. piping,treatment equipment,a foundation,and i utilities. Also requires long-term maintenance and operation of equipment. • Permitting and approval State policy currently developing would allow A widely accepted technology. State and fuel constituents to remain after source local agencies are likely to approve.A material removal as long as monitoring discharge permit is required to send treated continues and a contingency plan is in place. groundwater to a POTW. increases hydraulic No permits required. loading to the POTW. Air quality permit and j building permit is required. • Public perception The public should receive information about Public may perceive the option as active . intrinsic bioremediation so they do not remediation. Noise and visual impacts are perceive the option as no action and no noise, associated with a pumping and treatment i visual impacts,or obvious activity, system. Costs • Capital Cost $ 11,700 $138,000 E. • Annual O&M Cost $ 16,460 $32,865 .'p } • Present Worth Cost $323,288 $760,138 SF010090995DOC