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2014 Annual Corrective Action Evaluation Report Austin Road Landfill, California Page3 3.0 Individual Wells Table 1 lists the Threshold Limits that were developed in the Evaluation Procedures Report for total VOC concentrations in individual wells. The historical database and time series plots for total VOC concentrations at individual wells are presented in Appendix B. Table 7 summarizes the evaluation of total VOC concentrations at individual wells. There were no exceedances of individual well Threshold Limits during the third quarter 2013, fourth quarter 2013, first quarter 2014, or second quarter 2014. 4.0 Condition of Landfill Cover Title 27 of the California Code of Regulations (CCR) § 20950(a)(2)(A)(1) specifies that "[fJor landfills and for waste piles and surface impoundments closed as landfills, the goal of closure, including but not limited to the installation of a final cover, is to minimize the infiltration of water into the waste, thereby minimizing the production of leachate and gas." The goal is to minimize infiltration of water rather than eliminate the infiltration of water. The Austin Road Landfill reported that the facility's cover performed as designed from third quarter 2013 through second quarter 2014 in that it minimized the infiltration of water into the waste. There were no significant problems with landfill cover that resulted in exposed waste from third quarter 2013 through second quarter 2014. Minor erosion issues were addressed by placement and compaction of soil material. There were reportedly no leachate seeps identified from third quarter 2013 through second quarter 2014. There were reportedly no notices of violation (NOVs) issued to the facility for cover -related issues from third quarter 2013 through second quarter 2014. As a part of overall operational improvements, an evapo-transpiration (ET) cover was installed on the north face of the facility, with the installation reportedly completed in November 2005. In July 2006, two multi -depth moisture probes, a wick lysimeter, and a weather station were reportedly installed to monitor the ET cover. Annual monitoring reports for the ET cover were submitted to the RWQCB on October 12, 2007, July 10, 2008, August 28, 2009, and September 3, 2010. In a letter dated August 5, 2008, the RWQCB concluded that the ET cover complies with Title 27 requirements for alternative cover. The RWQCB subsequently approved the discontinuation of ET cover monitoring in a September 23, 2010 letter. 5.0 Landfill Gas Monitoring Results The gas collection and control system at the combined Austin Road / Forward Landfill complex includes 194 extraction wells, a flare for thermal destruction (Flare A-2), a backup flare (Flare A-1), and a methane gas recovery facility that generates electricity. The Austin Road / Forward Landfill complex includes 27 perimeter landfill gas monitoring probes spaced 1,000 feet apart, pursuant to CCR Title 27. The probe Dations include multi-level monitoring of shallow and deep intervals. Several of the probe locations also include monitoring of a medial interval. Combined, the perimeter monitoring system includes 77 individual monitoring points, plus additional temporary gas probes. Thirteen of the 27 permanent probes are located around the perimeter of the Austin Road portion of the facility, comprising 39 of the 77 individual monitoring points: GP -13 through GP -25. Landfill gas sample results provided by Austin Road Landfill personnel for third quarter 2013 through second quarter 2014 are provided in Appendix C. Austin Road gas monitoring probes GP -13 through 11