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v <br /> A S S O C I A T E S I N C <br /> wells in the unsaturated zone capture sparged air If necessary the effluent air can be treated <br /> using a variety of vapor treatment options Phis method also stimulates biodegradation by <br /> ' increasing the supply of oxygen in the subsurface <br /> The advantages of in-situ air sparging with soil vapor extraction include <br />' h <br /> *S ort treatment times, usually 6 months to 2 years under optimal conditions <br /> *Readily ava>lable equipment and easy installation <br /> •Implementation with minimal disturbance to aboveground activities <br /> *Requires no removal, treatment, storage, or discharge considerations for groundwater <br />' <br /> *Cost competitive <br /> •Can be used under buildings and other locations that cannot be excavated <br /> In order to determine the effectiveness of vapor extraction and air sparging, pilot testing was <br /> performed at the site Results indicated that both of these methods are feasible alternatives for <br /> remediation of the site Data provided by the pilot studies can be used to properly design a full- <br />' scale air sparge/soil vapor extraction system The plot studies have also provided information <br /> on the concentration of VOCs that are likely to be extracted during the early stages of the <br /> operation <br /> M6.0 REMEDIATION ALTERNATIVES EVALUATION <br />' Each of the alternatives presented above were evaluated according to the following criteria <br /> 1 Level of protection of humanhealth 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 />' 6.1 Natural Attenuation with Groundwater Monrtorin� <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, <br /> or dermal contact with impacted soil and groundwater is minimal, with little or no fire or <br /> explosion hazard The shallowest aquifer is located approximately 20 feet below ground <br /> surface and is impacted This aquifer is currently classified as a drinking water source but is <br />' not generally used as such <br /> W 1625961reportslpilotcap doe 9 <br />