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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -25- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY c. If the Executive Officer determines, after reviewing the submitted report(s), that the VOC(s) detected originated from a source other than the Unit(s), the Executive Officer will make appropriate changes to the monitoring program. 22. If the Executive Officer determines, after reviewing the submitted report, that the detected VOC(s)most likely originated from the Unit(s),the Discharger shall immediately implement the requirements of XI. Response To A Release, C. Release Has Been Verified, contained in the Standard Provisions and Reporting Requirements. 23. The discharger shall monitor all soil gas monitoring probes for the presence of VOCs on an annual basis in compliance with Monitoring and Reporting Program No. R5-2003-0049. Upon confirmation of a VOC release in landfill gas in a given area of the landfill, Gas extraction shall be implemented for that area. F. CORRECTIVE ACTION MONITORING 1. The Corrective Action Monitoring Program shall be used to assess the nature and extent of the release from the landfill and to evaluate the effectiveness of the corrective action program and the landfill cover. 2. In accordance with the Corrective Action Monitoring Program, the Discharger shall collect and analyze all data necessary to assess the effectiveness of the Corrective Action in reducing the impacts of the release on groundwater quality. A sufficient number of monitoring wells shall be installed to delineate the release. 3. The Discharger shall comply with the monitoring provisions for the Corrective Action Program(CAP) as described in Section 20430(4) of Title 27. The program shall include the detection monitoring program as well as an annual report evaluating the ground water and unsaturated data of the past year(s) in an effort to demonstrate the effectiveness of the CAP. 4. The discharger has proposed a system of specific threshold limits to evaluate the effectivness of the CAP (Evaluation Procedures for Proposed Corrective Action at Austin Road Landfill). The system uses both changes in VOC mass within the contaminant plume and changes in VOC concentrations at individual wells to evaluate remedial effectiveness. Upon determination that an exceedance for either the total mass or individual well threshold limit has occurred using the method and threshold limits described in Evaluation Procedures for Proposed Corrective Action at Austin Road Landfill, the discharger shall notify the RWQCB within 14 days and shall submit an evaluation of the CAP within 90 days.