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 20 • Rule 4102 (Nuisance). This rule prohibits discharge of air contaminants or other materials which cause injury, detriment, nuisance or annoyance to any considerable number of persons or to the public or which endanger the comfort, repose, health or safety of any such person or the public or which cause or have a natural tendency to cause injury or damage to business or property. • Rule 4642 (Solid Waste Disposal Sites). This rule limits volatile organic compound emissions from solid waste disposal sites. • Regulation VIII (Fugitive PM10 Prohibitions). This regulation consists of a series of rules requiring the implementation of dust control measures to reduce fugitive dust emissions generated by human activity. ASSESSMENT METHODOLOGY Regional Air Quality Consistent with Appendix G of the CEQA Guidelines, the Valley Air District has adopted thresholds of significance to assist lead agencies in the evaluation and mitigation of air quality impacts under CEQA (Valley Air District 2015). The District’s thresholds establish levels at which emissions of ozone precursors (ROG and NOx), PM10, PM2.5, carbon monoxide, sulfur oxides (SOx), TACs, and odors could cause significant air quality impacts. The Valley Air District’s thresholds of significance that are used in this analysis are summarized below in Table 1. Table 1. Air Quality Thresholds of Significance IMPACT ANALYSIS POLLUTANT THRESHOLD OF SIGNIFICANCE Criteria Air Pollutants (Construction and Operation1) CO 100 tons per year NOx 10 tons per year ROG 10 tons per year SOx 27 tons per year PM10 15 tons per year PM2.5 15 tons per year Health Risks and Hazards (Combined) Toxic Air Contaminant For the Maximally Exposed Individual: Cancer risk increase > 20.0 in one million Chronic hazard index > 1.0 Acute hazard index > 1.0 1 Construction emissions, operational emission from permitted equipment and activities, and operational emissions from non-permitted equipment and activities are evaluated separately. Source: Valley Air District 2015 Carbon Monoxide Hotspots In addition, the Valley Air District has established that preliminary screening can be used to determine with a fair level of certainty that the effect a project has on any given intersection would not result in a carbon monoxide hotspot. According to the Valley Air District, a project would result in a less-than-significant impact related to localized carbon monoxide concentrations if neither of the following screening criteria are met at all intersections affected by the development project: