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5 3 DEVELOPMENT OF REMEDIAL OPTIONS <br /> The remedial options based on applicable general response actions and appropriate <br /> technology types are discussed below Each option is described in terms of initial remedial <br /> action that would be undertaken, operation and maintenance (O&M) requirements, monitoring, <br /> and achievable clean-up levels Nine potentially appropriate remedial options were developed <br /> to address soil impacts at the site The options are based on the nature and extent of impacts, <br /> appropriate general response actions, and technically feasible process options, as discussed in <br /> previous sections The options span a broad range of technology types, degrees of cleanup, and <br /> costs The options listed below are discussed in the following text <br /> • No-Action - Option 1 <br /> • Limited Action Groundwater Monitoring - Option 2 <br /> • Limited Action Groundwater Monitoring and Cap Maintenance - Option 3 <br /> • Bioventing - Option 4 <br /> • In-Situ Bioremediation - Option 5 <br /> • Excavation to Background Concentration and Off-Site Disposal - Option 6a <br /> * Excavation to 1,000 mg/kg and Off-Site Disposal - Option 6b <br /> Excavation to Background Concentration and On-Site Thermal Treatment - Option 7a <br /> • Excavation to 1,000 mg/kg and On-Site Thermal Treatment - Option 7b <br /> 5 3 1 No-Action - Option 1 <br /> The No-Action alternative is the baseline of the feasibility Y p analysis Under this option, <br /> no active steps (beyond those already performed) would be taken to further reduce the mass of <br /> petroleum hydrocarbons in soil No further groundwater monitoring would be performed <br /> The existing asphaltic concrete pavement would act as a cap to enhance surface runoff <br /> in the area of impacted soils and minimize infiltration The pavement would limit percolation <br /> through impacted soils, thereby reducing potential for migration of diesel constituents to the <br /> groundwater table If not maintained, the pavement is likely to deteriorate somewhat over time, <br /> and would therefore gradually become a less effective barrier to infiltration An additional <br /> mitigating factor is that naturally occurring soil microbes will continue to degrade the <br /> hydrocarbons <br /> SAC127 io 12 <br /> DAMES &MOORE <br />