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<br /> <br />Forward Landfill – SIR 6 www.scsengineers.com <br /> <br />Table 5 – Intermediate Cover <br />Area Year Intermediate Cover <br />was Placed <br />Year Filling is Anticipated <br />to Occur <br />Total Duration of <br />Intermediate Cover <br />(Years) <br />B 1998 2036 38 <br />C 1997 2034 37 <br />D 1993-2022 2036 0-43 <br />FU-03 2004-2016 2026 9-22 <br />FU-04 2005-2016 2026 9-21 <br />FU-05 2006-2016 2026 9-20 <br />FU-06 2007-2016 2026 9-19 <br />FU-08 2016-2022 2028 6-12 <br />FU-10 2016-2022 2028 6-12 <br />FU-13 2020 2030 10 <br />FU-14 2021-2022 2030 8-9 <br />FU-17 2018-2022 2030 8-12 <br />5.4 SURFACE EMISSIONS MONITORING <br />In accordance with CCR Title 17 (17 CCR), Landfill Methane Rule (LMR) under AB 32, SCS prepared <br />the 2021 AB32 LMR Annual Report (2021 LMR) on behalf of the Site. As part of the LMR <br />requirements, surface emissions monitoring (SEM) is performed on a quarterly basis at the Site in <br />accordance with the requirements of the Permit. Please note that per Section 95469(a)(1)(C) of the <br />AB 32 LMR rule, any closed or inactive MSW landfill that has no monitored exceedances of 500 <br />ppmv after four consecutive quarterly monitoring periods may monitor annually. <br />Per SIR requirements, information on all instantaneous surface readings for methane of 500 parts <br />per million, by volume (ppmv), or greater in the area(s) of intermediate cover that has or will be in <br />place for more than 12 months must be identified. Thus, the 2021 LMR, was analyzed to identify <br />locations of instantaneous surface emissions above 500 ppmv in areas of intermediate cover. A total <br />of thirty (30) SEM exceedances above the 500 ppmv threshold were observed during the 2021 <br />annual reporting period. The annual report indicated that remedial actions and re-monitoring <br />activities were performed at each of these locations. All exceedances remediated and were found <br />below the threshold within regulatory timelines, and no further testing or remedial actions were <br />required. The 2021 SEM grid map with intermediate cover areas can be found in Appendix A. Details <br />of initial monitoring, remediation activities and re-monitoring events can be found in the 2021 LMR <br />report, and is available upon request. <br />6 VOLUMETRIC CAPACITY <br />For the purposes of this report, the remaining landfill airspace capacity, or volumetric capacity, was <br />updated to reflect a 75% upstream diversion of organic waste by 2025. To calculate the volumetric <br />capacity the following were used: <br /> Net remaining airspace as of January 31, 2020 of 21,737,819 CY per the JTD;