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Corrective Action <br /> Program <br /> Install Final Cover <br /> and Landfill Gas <br /> Extraction Wells <br /> Installation to b completed in 2013 Note: Landfill Gas System Audit <br /> includes the following elements: <br /> Monitor Groundwate 1)Evaluate well depths <br /> and Soil-Pore Gas 2)Evaluate vacuum <br /> Chemistry 3)Evaluate header lines/connections <br /> 4)Gas production modeling <br /> Initial 8 Quarterly onitoring Events(2 years) <br /> Evaluate VOC Increasing or Static <br /> Decreasing Trends Concentration Trends <br /> Trends <br /> Within 1 month after Jet rmining that trends are increasing <br /> Continue Corrective 4 Quarters Audit LandfiI <br /> Action Monitoring Extraction S <br /> 8 quarter proo period(VOCs not detected) Audit to require i <br /> ately 6 months <br /> Return to Detection Make System <br /> Monitoring Adjustments and <br /> Enhancements <br /> 4 Qu rters <br /> Decreasing Trends Evaluate VOC <br /> Concentrations <br /> Increasing or Static <br /> Trends <br /> Pledge for Water <br /> Supply or Weil-Head <br /> Treatment <br /> Gain approval from Evaluate <br /> RWQCB and County Additional <br /> Corrective Actions <br /> A Propose Concentration <br /> Limits Greater than <br /> Background <br /> Groundwater <br /> Air Sparging Extraction and New Technologies <br /> Treatment <br /> Develop and <br /> Implement Pilot <br /> Study <br /> Effectiveness <br /> Monitoring <br /> (4 Quarters) <br /> Decreasing VOC trends Evaluate VOC Increasing VOC trends <br /> Trends <br /> FIGURE 12 <br /> CORRECTIVE ACTION DECISION TREE <br /> ENGINEERING FEASIBILITY STUDY <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> Geo-Logic Associates <br /> Geologists, Hydrogeologists, and Engineers <br /> DRAWN BY: DATE: JOB NO. <br /> VL JANUARY 2013 2011-115 <br />