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source material should the opportunity present itself during future site improvements <br /> and if warranted. <br /> 5.4 COMPARISON OF REMEDIAL ALTERNATIVES <br /> TABLE C <br /> DPE AS/SVE Excavation MNA <br /> Effectiveness Poor to <br /> Poor Moderate Good Good <br /> Design and <br /> Permitting NA $25,000 $25,000 NA <br /> Well Replacement NA NA 1 $100,000 <br /> Construction NA $726,000 $750,000 NA <br /> Operational <br /> Duration NA 2 years NA NA <br /> Total Startup& <br /> Operational Cost NA 346,500 $90,000 NA <br /> Annual <br /> Groundwater <br /> Monitoring Cost NA $35,000 $35,000 $20,000(average) <br /> Total Groundwater <br /> Monitoring <br /> Duration NA 5 years 5 years 4 years <br /> Total Groundwater <br /> Monitoring Cost NA $175,000 $175,000 $80,000 <br /> System Demo NA $70,000 NA NA <br /> Closure Request <br /> and Well <br /> Destructions NA $97,000 $97,000 $97,000 <br /> Total Cost NA $1,426,000 $1,122,000 $177,000 <br /> NA=Not applicable <br /> 6.0 CONCLUSIONS <br /> The site conceptual model demonstrates that the COC plumes are slowly collapsing and <br /> not migrating. No receptors are currently at risk. <br /> Secondary source has been remediated to the extent practicable. Previous remedial <br /> activities at the site have included GWE and SVE. Residual source remains localized in <br /> SA-1,SA-2,and SA-3. <br /> 241729(3a) 24 CONESTOGA-ROVERS&ASSOCIATES <br />