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,CVv:ATC <br /> A S S O C I A T E S I N C <br /> s <br /> volatilized organic compounds If necessary the effluent air can be treated using a variety of <br /> vapor treatment options <br /> The advantages of SVE include <br /> 1 9 Short treatment times, usually 6 months to 1 year under optimal conditions <br /> • Readily available equipment and easy installation <br /> • Implementation with minimal disturbance to above ground activities <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 /> 1 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 /> 1 to be extracted during the early stages of the operation <br /> A pilot test would require the installation of two vapor wells to depths of approximately 35 feet <br /> 1 bgs Once these wells are in place, appropriate equipment would be plumbed to these wells and a <br /> pilot scale study will be performed, then the SVE system would be designed, installed and <br /> operated until remediation is complete <br /> } 6.3 Small Community Well Destruction and Replacement <br /> The existing supply well is the only potential nearby receptor which might be significantly <br /> impacted by the residual soil contamination The supply well provides drinking water to <br /> approximately 30 people on site The supply well could be properly destroyed and a replacement <br /> 1 well would be installed in a location further away and crossgradient or upgradient from the <br /> residual soil contamination This would remove the only potential receptor located within one- <br /> third mile of the site, remediation would not be required, and the site could be closed <br /> A brief inspection of the site's supply well by ATC personnel on October 24, 1997 revealed the <br /> 1 concrete base or pad constructed at the ground surface around the top of the well casing was <br /> detached from the annular seal <br /> 1 7.0 REMEDIATION ALTERNATIVES EVALUATION <br /> Each of the alternatives presented above were evaluated according to the following criteria <br /> 1 1 Level of protection of human health and the environment <br /> 2 Reduction of toxicity, mobility and volume of contaminants <br /> 1 3 Compliance with regulatory guidelines <br /> 4 Cost effectiveness/public benefit <br /> 5 Short term effectiveness <br /> w 1943044epotU\c1osure dm 6 <br /> 1 <br />