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Updated Site Conceptual Model and First Quarter 2002 Monitoring and Remediation Report <br /> Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 <br /> 6.0 RECOMMENDATIONS <br /> The following actions are recommended to optimize the remediation efficiency <br />' • Obtain wellhead readings on a monthly basis using a PID to determine if operation of <br /> the vapor extraction system is warranted A PID reading of 500 ppm or greater at any <br /> wellhead will trigger activation of the vapor extraction system Should it be necessary <br /> to operate the vapor extraction system, we recommend installation of a catalytic mode <br /> on the oxidizer, the costs of which have already been pre-approved by the UST Cleanup <br /> Fund <br /> • Continue air sparging, except for deep well MW-23S (see Section 5 5 2) <br /> • Complete the Second Quarter 2002 monitoring in June 2002 <br /> sHM t212x0231 <br /> -11- <br /> ENVIRONMENTAL AUDIT, INC <br />