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V <br /> The advantages of SVE with groundwater extraction and treatment include: <br /> • Short treatment times; usually 2 to 6 years under optimal conditions. <br /> • Readily available equipment and easy installation. <br /> • Implementation with minimal disturbance to above ground activities. <br /> • Cost competitive. <br /> • Can be used under buildings and other locations that cannot be excavated. <br /> In order to determine the effectiveness of SVE and groundwater extract; n and treatment, a pilot <br /> scale study'would first need to be performed at the site. <br /> 7.0 REMEDIATION ALTERNATIVES EVALUATION <br /> Each of the alternatives presented above were evaluated according to the following criteria:' <br /> 1. Level of protection of human health and the environment <br /> 2. Reduction of toxicity,mobility and volume of contaminants <br /> 3. Compliance with regulatory guidelines s <br /> 4. Cost effectiveness/public benefit <br /> 5. Short term effectiveness <br /> 6. Long term effectiveness <br /> 7. Implementabiliry <br /> 8. Regulatory and community acceptance <br /> 7_1 Alternative 1 -Natural 'Attenuation with Groundwater Monitoring <br /> ♦ Criterion 1: <br /> The natural attenuation alternative has no immediate health based risks. The site is surfaced <br /> with asphalt and concrete so the possibility.for exposure to.humans.by volatilization, dust, <br /> or dermal contact with impacted soil and groundwater is minimal, with little or no free or <br /> explosion hazard. Several potential receptors have been identified south of the site. The <br /> nearest receptor is approximately 1,000 feet south of the site. The shallowest aquifer is <br /> located approximately 50 feet below ground surface and is impacted. This aquifer is <br /> currently classified as a-drinking water source and the downgradient municipal drinking <br /> water well is screened from 79 to 99 feet bgs. <br /> ♦ Criterion 2. <br /> This alternative would reduce the existing-•levels and volume. of impacted soil and <br /> groundwater over time by natural degradation and attenuation, but the rate of reduction is <br /> not known. The possible migration.of petroleum hydrocarbons in soil caused by surface <br /> water flushing contaminants into the groundwater is low due to the asphalt and concrete <br /> surface on site. The groundwater gradient direction has been consistently south with a <br /> 5:\22493\reports\CAP.doc g <br />