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� v <br /> A S S O C I A T E S I N C <br /> Previous pilot testing indicated that the vapor extraction and air sparge is a feasible <br /> alternative for remediation of the site <br />' ♦ Criterion 3 <br /> This alternative can be implemented within regulatory guidelines <br /> ♦ Criterion 4 <br />' The soil vapor extraction and air sparging remediation alternative would require the <br /> installation of additional vapor extraction and sparge wells, air infection and vapor <br /> extraction equipment, and the abatement equipment A thermal oxidizing unit or catalytic <br />' oxidizing unit can be used initially for the treatment of off-gases but may be changed to <br /> vapor-phase carbon after concentrations are reduced to levels acceptable to the regulatory <br /> agencies Additional costs to the client would be incurred for permitting, leasing, and <br />' installing the vapor extraction equipment and treatment compound, and operation and <br /> maintenance of the system The cost of this alternative is estimated to be between $140,000 <br /> and $220,000 <br /> ♦ Criterion S <br /> This alternative should effectively remediate subsurface contaminants to acceptable <br /> regulatory levels within 1 to 3 years of implementation <br /> ♦ Criterion 6 <br /> The long term effectiveness for soil remediation would be good depending upon the degree <br /> of contaminant removal Groundwater would be monitored periodically until soil and <br /> groundwater is remediated to ensure that concentrations of petroleum hydrocarbons are <br /> being reduced <br />' O Criterion 7 <br /> This alternative has some minor implementability 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 />' ♦ Criterion 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 /> Based on the soil and groundwater data compiled and included in this technical report, ATC <br /> Associates recommends in-situ air spargm with soil va o� r extraction for remediation of the <br /> W%62596Wcportslpi1otcap doc 13 <br />