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Working To Restore Nature <br /> approach $75,000. Ongoing operation and maintenance costs could approach <br /> $20,000 to $25,000 per year. <br /> 1 <br /> O Criterion 5: <br /> This alternative should have an immediate impact because it results in the direct . <br /> removal and treatment of contaminated groundwater. <br /> O Criterion 6: <br /> rThe long term effectiveness for groundwater remediation would be considerable. <br /> Remediation of soil contaminants would occur through natural biodegradative <br /> processes over time, but the rate of decay is unknown <br /> O Criterion 7: <br /> This alternative has some minor implementability problems associated with <br /> permitting, design and construction. <br /> ' O Criterion 8 <br /> ' Impact to businesses and the community would be minimal <br /> ' 9.0 PROPOSED ALTERNATIVE FOR REMEDIATION <br /> Based on the evaluation of remediation alternatives, RESNA proposes to remediate petroleum <br /> ' hydrocarbon bearing groundwater beneath the site by designing, installing, and operating a <br /> groundwater treatment system (GWTS) with continued groundwater monitoring. The GWTS <br /> ' would initially include one groundwater extraction well, liquid phase granular activated carbon <br /> filter for treatment of extracted groundwater, incidental instrumentation, and associated supply <br /> ' and discharge piping Since the remaining impacted soil lies below the historic high <br /> groundwater level and consists of fine-grained soils with low permeability, active soil <br /> ' remediation will not be performed at this time <br /> 15=9XREP0 rs\cnr-a7%DRF 22 <br /> 1 <br />