Laserfiche WebLink
Memorandum <br />25 March 2025 <br />Page 13 <br />The methane emissions from LFG for 2026 shown in Table 1 above were estimated to represent <br />the project year (2026) impact. As waste is continuously deposited in the landfill, methane <br />production would gradually increase throughout the landfill’s operational life. After closure and <br />capping the landfill, the rate of methane generation typically declines due to reduced moisture <br />infiltration. The overall methane generation rates for the baseline and project conditions were <br />estimated using LandGEM and are illustrated in Chart 1. As shown in Chart 1, the project <br />condition (orange dashed line) results in an earlier and higher peak methane emission rate <br />compared to the baseline condition (blue line). After the closure year, methane emissions <br />under both conditions decline, and the project condition shows a lower long-term emission rate <br />compared to the baseline condition. <br />Chart 1. LFG Derived Methane Emissions <br /> <br />To represent the overall impact of the project, total LFG-derived methane emissions over 50 <br />years past the project year (2026 to 2076) were estimated for the baseline condition and the <br />project condition and then averaged to obtained representative average annual GHG emissions <br />rates. The assumptions and associated calculations for estimating LFG-derived methane <br />emissions are provided in Attachment A. Over 50 years, the LFG generated under baseline and <br />project conditions would result in total CO2e emissions of 2,864,788 metric tons (57,296 metric