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• Grudfos pump will be replaced with a 7 5 hp circulation pump The new pump will require a larger motor starter and wiring The remainder of t h e NEEP system will stay the same One additional GAC unit will be installed (Figure 13), for a total of four 2,000 pound GAC units This fourth GAC vessel will allow for the necessary additional retention time ASE will likely need to modify its City of Manteca Discharge Permit to allow for a greater volume of treated water into the sewer system 6 Other Relevant Information 6 6 1 Permits Permits to install the air-sparge and vapor-extraction wells will b e obtained from the San Joaquin County PHS-EHD Construction permits ie grading, plumbing, electrical, and mechanical permits will be obtained from the City of Manteca, as necessary A SJVAPCD permit will b e acquired for the abatement device Influent and effluent sampling will b e conducted as required by the SJVAPCD 6 6 2 Security The treatment system will be secured on the subject site using cyclone fencing 6 6 3 Maintenance and Reporting The system will be maintained and operated continuously At least twice weekly, the system may require adjustments to maintain optimal performance parameters On a monthly basis, a report will be prepared detailing the performance of the systems based on influent and effluent air stream and water stream concentrations As currently being performed, the groundwater monitoring wells for all site wells will b e sampled on a quarterly basis followed by a complete report detailing the methods and findings of the well sampling and analyses activities In addition, ASE will continue to sample the wells on the north shoulder of West Yosemite Avenue during the period between quarterly sampling events Frank's One Stop Remedial Action PIan — August 2001 -23-