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9&e r <br /> A S S O C I A T E S I N C <br /> would require considerable capital outlay Additional costs to the client would be incurred for <br /> permitting, leasing, and installing the vapor extraction equipment and treatment compound, and <br /> operation and maintenance of the system The cost of flus alternative is estimated to be <br /> between$140,000 and$220,000 <br /> ♦ Cntenon 5 <br /> This alternative should effectively remediate subsurface contaminants to acceptable regulatory <br /> levels within 6 months to 2 years of implementation <br /> ♦ Cntenon 6 <br />' The long term effectiveness for soil remediation would be good depending upon the degree of <br /> contaminant removal Groundwater would be monitored periodically until soil and <br /> groundwater is remediated to ensure that concentrations of petroleum hydrocarbons are being <br />' reduced <br /> ♦ Criterion 7 <br />' This alternative has some minor unplementability problems due to the time involved in <br /> obtaining permits from the APCD for the vapor extraction system Permitting could take as <br /> much as 180 days depending upon APCD work load, but is typically completed in 60 to 90 <br /> days <br /> ♦ Cntenon 8 <br />' Impact to the site occupants and surrounding businesses during installation and other site <br /> activities will be moderate This method has been shown to be effective and regulatory <br /> acceptance is expected <br /> 7.0 RECOMMENDATIONS <br /> 1 Based on the soil and groundwater data compiled and included in this technical report, ATC <br /> Associates recommends in-situ air sparging with soil vapor extraction for remediation of the <br /> petroleum hydrocarbons beneath the site The natural attenuation and groundwater extraction <br /> with soil vapor extraction alternatives have slower rates of removal, appear to be more costly in <br /> the long run, and will not likely be acceptable to the regulatory agency Upon regulatory <br />' concurrence of the preferred remedial action method and client approval, ATC Associates will <br /> prepare and submit a final remediation plan which includes a conceptual design of the remediation <br /> system <br /> 1 <br /> 1 W 162574 011pdot-fs report doe 14 <br />