COMPLIANCE INFO_FINAL INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 5/25

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Memorandum 25 March 2025 Page 11 version 2022.1 methodologies. For mobile sources, GHG emissions from project-generated vehicle trips were estimated using year 2024 emission factors from CARB’s EMFAC2021 database. Because statewide vehicle emission standards are required to improve over time in accordance with vehicle emission regulations, using the emission factors for the baseline year (2024) provides the maximum expected annual emissions. The input parameters and assumptions used to estimate GHG emissions from off-road heavy construction equipment and mobile sources are provided in Attachment A of the Air Quality Technical Study 6 for the proposed project (also includes in Attachment A of this report). The long-term LFG emissions of methane for the North County Landfill were estimated using the EPA Landfill Gas Emission Model (LandGEM,) version 3.1 and AP-42 default inputs. Information about historical waste acceptance rates (1991 to 2023), closure year (project condition), and predicted annual increases in waste intake were provided by the applicant. For the baseline condition, it was assumed that 250,000 tons of waste was accepted in 2024, and a three percent increase in waste disposal rate per year thereafter. Under this scenario, the North County Landfill would reach the 20.6 million tons design capacity 7 by 2059. For the project condition, it was assumed that the waste disposal rate would increase from 250,000 tons in 2024 to 660,000 tons in 2026, then a three percent increase in waste disposal rate per year thereafter. Under this scenario, the North County Landfill would reach the 20.6 million tons design capacity by 2043. As described above, LFG-derived CO2 emissions (including CO2 from combustion of methane at the flare) are considered biogenic and a part of the natural carbon cycle, and are not considered an anthropogenic contributor to climate change; therefore, the biogenic CO2 emissions from LFG are not included in the evaluation of the project’s potential impacts on climate change from GHG emissions. Methane content in the LFG was assumed to be 50 percent. Although the North County Landfill has a landfill gas collection system, those systems are not 100 percent efficient in collecting LFG and hence fugitive emissions of methane would still occur. With the absence of site-specific data, LFG collection system collection efficiencies, which are subject to landfill cover type, were obtained from 40 CFR Part 98 subpart HH. The North County Landfill is only partially built and as such all cover on the site is either daily or intermediate cover. Construction of final covers are planned to be done in conjunction with the excavation and construction of future modules. 6 Baseline Environmental Consulting, 2025. Air Quality Technical Study, North County Sanitary Landfill and Recycling Center Solid Waste Facility Permit Amendment Project, Lodi, California. March. 7 Estimated based on the waste design capacity of 41.2 million cubic yards reported in the Solid Waste Facility Permit 39-AA-0022 and an average refuse density of 1,000 pounds per cubic yards.