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CLEARWATER <br />' G a a u P <br /> Environmental Services <br /> I <br /> threatened The results of the sensitive receptor survey performed by Clearwater at the site <br />' indicate no drinking water sources are threatened at this time <br />' It should be noted that these are clean-up goals, and that it is often extremely difficult or <br /> impossible to achieve such clean-up goals It is likely that at some point during the course of <br />' active remediation that contaminant recovery rates will become negligible, and continued <br /> remedial operation costs cannot be justified If such a scenario came to pass, it would be worth <br /> evaluating the rate at which the residual dissolved-phase plume would naturally attenuate to <br />' below the clean-up goals as a final plume management plan <br />' 6.0 EVALUATION OF REMEDIAL ALTERNATIVES <br />' 6.1 Purpose and Scope <br /> Remediation technologies were evaluated for technical leeffficacy at the site and overall cost In <br /> order to strive for the clean-up goals identified earlier, f� ive relatively aggressive remedial options <br /> are evaluated below Achievement of dissolved-phase clean-up goals dictates relatively thorough <br /> remediation of sorbed-phase contaminants If sorbed-phase contamination is not addressed, it <br /> will likely act as an ongoing source of dissolved-phase contamination over time rendering direct <br /> groundwater remediation ineffective at achieving clean-up goals in a timely fashion The <br /> Imajority of sorbed-phase contamination resides beneath the area between the former UST pit and <br /> MW-5B (Figure 4), which appears to be sourcing dissolved-phase contamination Accordingly, <br /> soil remediation options will focus on the core of this area, and groundwater remediation options <br /> will focus on the footprint of dissolved-phase contamination as detected in September, 2002 <br /> The options considered below include scenarios of concurrent soil and groundwater remediation <br /> in the most appropriate combinations <br /> Remedial Media Remedial <br /> Option Affected Technology Evaluated <br /> Option 1 Soil SVE wlcatox <br /> Groundwater GWE w/GAC&(AS) <br /> Option 2 Soil Excavate w/Thermal Treatment of Soil <br /> Groundwater GWE <br /> Option 3 Soil Excavate wl Soil Aeration <br /> Groundwater GWE <br /> tion 4 Soil Excavate w/Thermal Treatment of Soil <br /> IGroundwater Enhanced Bioremediation 1SOC <br />' ZB 178C CAP 1 I November 20,2002 <br />