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 21 • A traffic study for the project indicates that the Level of Service (LOS) on one or more streets or at one or more intersections in the project vicinity will be reduced to LOS E or F; nor • A traffic study indicates that the project will substantially worsen an already existing LOS F on one or more streets or at one or more intersections in the project vicinity. Toxic Air Contaminants For risk assessment purposes, TACs are separated into carcinogens and non-carcinogens. Carcinogens are assumed to have no safe threshold below which health impacts would not occur, and cancer risk is expressed as excess cancer cases per 1 million exposed individuals over a lifetime of exposure. Non-carcinogenic substances are generally assumed to have a safe threshold below which health impacts would not occur. Acute and chronic exposure to non- carcinogens is expressed as a hazard index, which is the sum of expected exposure levels divided by the corresponding acceptable exposure levels. Odors The Valley Air District has identified some common types of facilities that have been known to produce odors, including sanitary landfills, and has established screening levels for potential odor sources, in the form of screening distances, to semi-quantitatively assess a project’s potential to adversely affect area receptors. For projects that would result in sensitive receptors being located closer than the screening level distances, the Valley Air District has established the following significance threshold for odor problems: • More than one confirmed complaint per year averaged over a three-year period, or • Three or more unconfirmed complaints per year averaged over a three-year period. DISCUSSION OF IMPACTS a) Conflict with or obstruct implementation of the applicable air quality plan? Less-than-Significant Impact As discussed in the Regulatory Setting section above, the Valley Air District has adopted several air quality attainment plans for particulate matter and ozone that identify measures needed in the SJVAB to attain NAAQS. Since the Valley Air District’s CEQA thresholds of significance were developed to be consistent with other air quality attainment plans and regulations, projects with emissions below the thresholds of significance for criteria pollutants would be determined to not conflict with or obstruct implementation of the Valley Air District’s air quality plans. As discussed in Impact b) below, the project’s emissions of criteria air pollutants from permitted and non- permitted equipment and activities would be below the thresholds of significance. In addition, the project would be required to comply with applicable rules and regulations of the Valley Air District, such as Regulation VIII, which requires dust control measures to control the release of fugitive PM10 emissions. Therefore, the project would not conflict with or obstruct any applicable air quality plan. The impact would be less than significant. b) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard?