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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />Table 2: Maximum Daily Operation Emissions <br />Regional Pollutant Emissions (pounds per day) <br />Operations VOc NOx co <br />sox <br />PM10 <br />PM2.5 <br />Maximum Daily Emissions 3.26 1.85 20.33 <br />0.05 <br />4.44 <br />1.15 <br />SCAQMD Significance Threshold 55 55 550 <br />150 <br />150 <br />55 <br />Exceed Threshold? No No No <br />No <br />No <br />No <br />Notes: <br />CO = carbon monoxide <br />NOX= nitrogen oxides <br />PM10 = particulate matter less than 10 microns in diameter <br />PM2.5 = particulate matter less than 2.5 microns in diameter <br />SCAQMD = South Coast Air Quality Management District <br />SOX = sulfur oxides <br />VOC = volatile organic compounds <br />Source: Appendix A. <br />As shown in Table 2, operational criteria pollutant emissions would not be anticipated to exceed the <br />recommended thresholds of significance. Therefore, the proposed project's long-term operational <br />impacts would be less than significant. <br />c) Expose sensitive receptors to substantial pollutant concentrations? <br />Less than significant impact. This impact evaluates the potential for the proposed project's <br />construction and operational emissions to expose sensitive receptors to substantial pollutant <br />concentration. Sensitive receptors are defined as those individuals who are sensitive to air pollution <br />including children, the elderly, and persons with pre-existing respiratory or cardiovascular illness. For <br />purposes of CEQA, the SCAQMD considers a sensitive receptor to be a location where a sensitive <br />individual could remain for 24 hours, such as residences, hospitals, or convalescent facilities.20 For <br />the proposed project, the closest off -site sensitive receptor is a mobile home community located <br />approximately 160 feet south of the project boundary. <br />Localized Significance Thresholds <br />The SCAQMD has developed localized significance thresholds (LSTs) as a tool to assist lead <br />agencies in analyzing localized air quality impacts to sensitive receptors in the vicinity of the project. <br />The SCAQMD's LST Methodology outlines how to analyze localized impacts from common pollutants <br />of concern, including NOx, CO, PM1o, and PM2.5.21 Localized air quality impacts would occur if <br />pollutant concentrations at sensitive receptors exceeded applicable NAAQS or California Ambient Air <br />20 South Coast Air Quality Management District (SCAQMD). 2008. Final Localized Significance Threshold Methodology. <br />Revised July 2008. Website: http://www.agmd.gov/home/rules-compliance/ceqa/air-quality-analysis-handbook/localized- <br />significance-thresholds. Accessed July 22, 2025. <br />21 Ibid. <br />Ny Council 22 — 46 3/1912026 <br />Https://adecinnovations.sharepoint.cam/sites/PubIicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISM ND.docx <br />