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......... _ ____________ _ <br /> Vv <br /> M <br /> ,_._._CATC <br /> r...`? A S S O C I A T E S I N C . <br /> The advantages of in-situ air sparging with SVE include: <br /> • Short treatment times; usually 6 months to 2 years under optimal conditions. <br /> • Readily available equipment and easy installation. <br /> • Implementation with minimal disturbance to above ground activities. <br /> =� . Requires no removal, treatment, storage, or discharge considerations for groundwater. <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, a pilot scale study would first need to be <br /> ? performed at the site. Data provided by a pilot study is necessary to properly design a full-scale <br /> SVE system. Pilot studies also provide information on the concentration of VOCs that are likely <br /> to be extracted during the early stages of the operation. <br /> A pilot test would require the installation of three vapor wells to depths of 8 to 12 feet bgs, and a <br /> single air sparging well to a depth of approximately 23 to 37 feet b s- Once these wells were in <br /> place, appropriate equipment would be plumbed to these wells and a pilot scale study will be r <br /> performed, then the SVE system would be designed, installed and operated until remediation is <br /> complete. k <br /> `.-. 8.0 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 <br /> 4. Cost effectiveness/public benefit <br /> 5. Short term effectiveness <br /> 6. Long term effectiveness <br /> 7. Implementability <br /> 8. Regulatory and community acceptance <br /> ; i <br /> 8_1 Natural Attenuation with Groundwater Monitoring <br /> Criterion I: <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, or � <br /> E <br /> dermal contact with impacted soil and groundwater is minimal, with little or no fire or <br /> explosion hazard. The only potential receptor is the on-site well which is located over 120 feet <br /> crossgradient from the groundwater plume. The shallowest aquifer is located approximately <br /> 10 feet below ground surface and is impacted. This aquifer is currently classified as a drinking <br /> water source but is not generally used as such. <br /> wA95122%reportslparcap.doc 9 <br /> r-,: <br />