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6 Gas Control and Monitoring Systems <br /> Any reduction in organics loading will reduce the long-term landfill gas generation. Note that the <br /> landfill has just barely reached the point at which it produces sufficient gas to justify investment <br /> in equipment that will provide beneficial use of the LFG. However,the reduction in organics will <br /> not reduce the costs in collection and monitoring systems. Those costs will continue to increase <br /> as the landfill grows while there is an incremental reduction in disposal cost as slightly smaller <br /> facilities (flares etc)will be required. However,the overall or cumulative impact will likely be <br /> increase costs with less revenue to fund expenses due to reduced gas production and the loss of <br /> the value of the gas that can be used to offset the cost of collection, monitoring and disposal. <br /> Currently there are no implemented or anticipated changes to the landfill gas control and/or <br /> monitoring methods due to the anticipated reduction in organic waste disposal. <br /> 7 Gas Generation <br /> The County uses an EPA model to develop LFG production projections. In order to account for a <br /> reduction in organics,the model was adjusted by a phased in 10% reduction in overall loading. <br /> The reduction is estimated to begin in 2023 and be fully in place by 2030. The net effect of the <br /> reduction in organics loading over the remaining life of the landfill is a projected 5% decrease in <br /> LFG. Model results are shown in Appendix B <br /> 8 Operation and Closure design <br /> The potential reduction in organic waste disposal is not expected to have a significant impact on <br /> current operations or the approved closure and post closure maintenance plans. As described <br /> previously the reduction in organics tons will likely change the ultimate closure date possibly by a <br /> year or two, but other factors such as growth,changes in consumer packaging, natural disasters <br /> or other significant macro changes to the waste stream could have equal or greater impacts as <br /> well. Given that the landfill has a stable 50 years remaining life,this one change does not merit <br /> further consideration until there is established documented data to drive those revisions. <br /> 9 Final Grading Plan <br /> A copy of the current final grading plan is included as Appendix A. As described in prior <br /> sections, there are no anticipated changes to the final grading plan or other documents <br /> based upon the currently approved organics reduction requirements. <br /> 7 <br />