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client would be incurred for permitting, leasing, and installing the vapor extraction <br /> equipment and treatment compound, and operation and maintenance of the system. The <br /> cost of this alternative is estimated to be between$300,000 and $450,000. <br /> ♦ Criterion S: <br /> This alternative should effectively remediate subsurface contaminants to acceptable <br /> regulatory levels within 2 to 6 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 petroleum hydrocarbons are reducing. <br /> ♦ Criterion 7: <br /> This alternative has some minor implementability problems due to the necessity of a pilot <br /> test and the time involved in obtaining permits from the APCD for the vapor extraction <br /> system. Permitting could take as much as 180 days depending upon APCD work load, but <br /> is typically completed in 60 to 90 days. Performing and evaluating the groundwater <br /> extraction test could take as much as 90 to 150 days depending on the SCDER review <br /> period. <br /> ♦ Criterion 8: <br /> Impact to the businesses during installation and other site activities will be moderate. This <br /> method has been shown to be effective in similar soil types and regulatory acceptance is <br /> expected. <br /> 8.0 RECOMMENDATIONS <br /> Based on the review of soil and groundwater data presented in this technical, air sparging and <br /> vapor extraction are recommended for remediating impacted soil and groundwater at the site. If <br /> ongoing groundwater monitoring indicates off-site migration of petroleum hydrocarbons is <br /> occuring, the addition of a groundwater extraction system should be evaluated. Upon regulatory <br /> concurrence of the preferred remedial action method, we will begin making arrangements for <br /> completing pilot tests to evaluate the performance of vapor extraction and groundwater air <br /> sparging as remedial options. <br /> The pilot tests will require the installation <br /> three vapor wells to depths o 50 to 60 eet bgs, and <br /> one air sparge well to a depth to 85 feet s. Once these wells are ' ace, appropriate <br /> equipment will be plumbed to the wells and a pilot ale study will be performed. Following the <br /> tests,the air sparge and soil vapor extraction systems ill be designed, installed and operated. <br /> e"ho Sei/< <br /> S:\22493\reports\CAP.doc I <br />