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Attachment A-1: LandGEM Input Parameter, Assumptions, and Results <br />LandGEM Input Parameters <br />Category Value <br />Landfill open year 1991 <br />Waste design capacity (million yard3)41.2 <br />Average refuse density (lb/yard3)1,000 <br />Pounds per ton 2,000 <br />Waste design capacity (tons)20,600,000 <br />Total refuse tonnage-in-place 5,069,648 <br />Landfill closure year (project)2043 <br />Landfill closure year (baseline)2059 <br />Methane generation rate (k) (year-1)0.02 <br />Degradable organic carbon content (DOC, <br />g Carbon/g Waste)0.2 <br />Potential methane generation capacity <br />(L0, m3/megagram)100 <br />NMOC Concentration (ppmv as hexane)600 <br />Methane Content 50% <br />AP-42 default <br />AP-42 default <br />AP-42 default <br />AP-42 default <br />Notes <br />Historical waste acceptance data (1991 to 2023) were provided by the applicant <br />Provided by applicant. Assumptions: increase waste acceptance rates from 250,000 tons in 2024 to 660,000 tons in 2026, then assume 3% increase <br />annually thereafter. Under this scenario, the North County Landfill will reach the 20.6 million tons design capacity by 2043. <br />Predicted based on the baseline operation condition (250,000 tons in 2024) and assume 3% increase annually thereafter. Under this scenario, the <br />North County Landfill will reach the 20.6 million tons design capacity by 2059. <br />AP-42 default for areas with less than 25 inches of precipitation per year. The project site area receives an average of 17.6 inches of precipitation <br />per year. <br />Information about historical waste acceptance rates (1991 to 2023), closure year, and project annual increase was provided by the applicant. GHG emissions from North County Landfill were <br />estimated using the EPA’s Landfill Generation Emissions Model (LandGEM, version 3.1) and default model inputs. <br />Solid Waste Facility Permit 39-AA-0022. <br />Solid Waste Facility Permit 39-AA-0022. <br />Page 1 of 25