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fr? Working To Restore Nature <br /> n Impacted soil occurs between approximately 7 and 18 feet below grade while groundwater <br /> r � <br /> is approximately 11 to 14 feet deep. Contaminated soil would be incinerated or <br /> bioremediated on site with subsequent use as backfill, or disposed of by surface landfilling <br /> r or use as roadbase. Extracted groundwater would be treated above ground using granular <br /> activated carbon, transported to a licensed disposal/recycling facility, or discharged to the <br /> City sanitary sewer system for treatment at the wastewater treatment plant. <br /> c%sem <br /> 4.1.2 Alternative 2 - In-situ Enhanced Bioremediation <br /> This alternative involves remediation of impacted soil by stimulating naturally occurring <br /> _ microflora or bacteria to degrade hydrocarbons in the soil and groundwater. Stimulation of <br /> `' the microbes is typically achieved by introduction of nutrients and oxygen through shallow <br /> injection wells or trenches. Groundwater is usually pumped and recirculated to control <br /> E- migration of the dissolved petroleum constituents and to distribute the oxygen and nutrients. <br /> This alternative is most effective in shallow, permeable soils containing relatively volatile <br /> -� contaminants. <br /> 4.2 Evaluation of Remediation Criteria <br /> Each of the above alternatives were evaluated according to the following criteria: <br /> 1. Level of protection of human health and the environment, including beneficial uses of ground <br /> and surface waters. <br /> .fry <br /> 2. Reduction of toxicity, mobility and volume of contaminants. <br /> 3. Short term effectiveness. <br /> 4. Long term effectiveness. <br /> --i <br /> `f'' 5. Compliance with regulatory guidelines. <br /> b. Cost effectiveness/public benefit. <br /> ,f <br /> 7. Implementability. <br /> 8. Regulatory and community acceptance. <br /> (r 9. Impacts on water conservation. <br /> r W0365%RePORTSICAP0294.FNL 5 <br />