Item 18 - Appeal Application Nos. 2023-02 and 2023-03 for Cabrillo Town Center project

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• Number and average length of construction worker trips to Project Site, per day; and • Duration of construction activities. In addition, the following criteria set forth in the SCAQMD's CEQA Air Quality Handbook serve as quantitative air quality standards to be used to evaluate project impacts under the Appendix G Thresholds. Under these thresholds, a significant threshold would occur when:20 • Regional emissions from both direct and indirect sources would exceed any of the following SCAQMD prescribed threshold levels: (1) 100 pounds per day for NOx; (2) 75 pounds a day for VOC; (3) 150 pounds per day for PM10 or SOx; (4) 55 pounds per day for PM2.5; and (5) 550 pounds per day for CO. • Maximum on -site daily localized emissions exceed the LST, resulting in predicted ambient concentrations in the vicinity of the Project Site greater than the most stringent ambient air quality standards for CO (20 ppm [23,000 pg/m3] over a 1-hour period or 9.0 ppm [10,350 pg/m3] averaged over an 8-hour period) and NO2 (0.18 ppm [339 pg/m3] over a 1-hour period, 0.1 ppm [188 pg/m3] over a three-year average of the 98th percentile of the daily maximum 1-hour average, or 0.03 ppm [57 pg/m3] averaged over an annual period). • Maximum on -site localized PM10 or PM2.5 emissions during construction exceed the applicable LSTs, resulting in predicted ambient concentrations in the vicinity of the Project Site to exceed the incremental 24-hour threshold of 10.4 pg/m3 or 1.0 pg/m3 PM10 averaged over an annual period. (b) Operation The City bases the determination of significance of operational air quality impacts on criteria set forth in the SCAQMD's CEQA Air Quality Handbook.21 As discussed above, the City uses Appendix G as the thresholds of significance for this analysis. Accordingly, the following serve as quantitative air quality standards to be used to evaluate project impacts under the Appendix G thresholds. Under these thresholds, a significant threshold would occur when: • Operational emissions exceed 10 tons per year of volatile organic gases or any of the following SCAQMD prescribed threshold levels: (1) 55 pounds a day for VOC;ZZ (2) 55 pounds per day for NOx; (3) 550 pounds per day for CO; (4) 150 pounds per day for SOx; (5) 150 pounds per day for PM10; and (6) 55 pounds per day for PM2.5.23 • Maximum on -site daily localized emissions exceed the LST, resulting in predicted ambient concentrations in the vicinity of the Project Site greater than the most stringent ambient air quality standards for CO (20 parts per million (ppm) over a 1-hour period or 9.0 ppm averaged over an 20 South Coast Air Quality Management District, Air Quality Significance Thresholds, revised March 2015. 21 South Coast Air Quality Management District, Air Quality Significance Thresholds, revised March 2015. 22 For purposes of this analysis, emissions of VOC and reactive organic compounds (ROG) are used interchangeably since ROG represents approximately 99.9 percent of VOC emissions. 23 South Coast Air Quality Management District, Quality Significance Thresholds, www.agmd.gov/docs/default- source/ceqa/handbook/scaqmd-air-quality-significance-thresholds.pdf, last updated March 2015. Cabrillo Town Center Project PAGE 19 City of Santa Ana Air Quality 1 V ouE 18 — 665 10/3/2023 July 2023