COMPLIANCE INFO_FINAL INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 5/25

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North County Recycling Center and Sanitary Landfill Permit Revision Project Final Initial Study/Mitigated Negative Declaration · San Joaquin County | May 2025 23 As shown below in Table 2, the project’s estimated net change in ROG, NOx, PM10, PM2.5, CO, and SOx emissions during operation are below the Valley Air District’s threshold of significance and would not result in a cumulatively considerable net increase in criteria air pollutants for which the region is in nonattainment; therefore, the project’s impact on regional air quality would be less than significant. Table 2. Estimated Annual Criteria Air Pollutant and Precursor Emissions from Non-Permitted Equipment and Activities (tons per year) EMISSION SCENARIOS ROG NOX PM10 PM2.5 CO SOX OFF-ROAD EQUIPMENT Baseline Condition 0.24 6.79 1.06 0.63 7.60 0.01 Project Condition 0.35 7.82 1.87 1.07 12.73 0.02 Net Difference 0.11 1.04 0.81 0.44 5.13 0.01 ON-ROAD MOBILE SOURCES Baseline Condition 0.13 3.70 1.40 0.31 0.18 0.03 Project Condition 0.13 3.54 1.48 0.31 0.18 0.04 Net Difference 0.01 -0.16 0.08 0.00 0.002 0.004 Total Net Difference 0.11 0.88 0.90 0.45 5.13 0.01 Valley Air District Thresholds 10 10 15 15 100 27 Threshold Exceeded? No No No No No No Source: Attachment A. Landfill Gas Operation of the project would increase criteria air pollutant emissions attributable to the potential increases in exhaust emissions from the flare. The reported emission inventory for the North County Landfill in 2023 was provided by the applicant and is summarized in Table 3 as a representation of the baseline condition. As shown in Table 3, under the baseline condition, emissions of ROG, NOx, PM10, CO, and SOx from the flare are relatively low – approximately two orders of magnitudes lower than the applicable Valley Air District operation thresholds for permitted sources. For the project condition, the maximum criteria air pollutant emissions from the flare were conservatively estimated using emission limits obtained from the project’s current Title V permit and the heat input to flare obtained from the 2023 inventory. For the project condition, the conservatively estimated maximum emissions from the flare are below the Valley Air District’s thresholds of significance. Therefore, the project’s impact from LFG-related criteria air pollutant emissions would be less than significant.