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WASTE DISCHARGE REQUIREMENTSORDER NO. R5-2003-0020 -21- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY a) An assessment of the nature and extent of the release from the Unit. This assessment shall include a determination of the special distribution and concentration of each constituent of concern throughout the zone affected by the release. b) For MSW landfills, the Discharger shall comply with the additional notification and monitoring system requirements incorporated by reference into State Water Resources Control Board Resolution No. 93-62, regarding notification and monitoring relative to offsite or potential off-site migration of waste constituents. c) Submit an engineering feasibility study for corrective action based on the data collected to delineate the release and from the ongoing monitoring program. d) For MSW landfills, the Discharger shall discuss the results of the engineering feasibility study, prior to the selection of a remedy, in a public meeting with interested and affected parties. e) Submit a report of waste discharge to the Board to establish a corrective action program meeting the requirements of §20430 of Title 27 based on the data collected to delineate the release and on the engineering feasibility study. 2. The Discharger, within 14 days of determining "measurably significant" evidence of a release, shall notify all persons who own the land or reside on the land that directly overlies any portion of the plume of contamination if contaminants have migrated off-site if indicated by sampling of detection monitoring wells. 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(d) of Title 27. The program shall include an annual report evaluating the ground water and unsaturated zone data of the past year(s) to demonstrate the effectiveness of the CAP. 11