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City of Santa Ana California Environmental Quality Act Initial Study/Mitigated Negative Declaration - 12 - Pollutant NOx PM10 PM2.5 SOx CO Maximum Emissions rate (lbs/day) 6.95 0.36a 0.24b <0.1c 12 Mass Daily Thresholds (lbs/day) 100 150 55 150 550 Exceed Threshold? No No No No No a PM10 total modeled emissions b PM2.5 total modeled emissions c SO2 modeled emissions The Project is not expected to result in a measurable long-term increase in air pollutant emissions. After construction, the Project will have minimal vehicle trips to the sites for inspection and maintenance procedures. Therefore, impacts would be considered less than significant. c) Certain residents, such as the very young, elderly, and those with specific illnesses or disabilities, are particularly sensitive to air pollution and are considered sensitive receptors. Sensitive receptors near the Project site include the Church of Christ in Tustin (16481 E. Main Street, Tustin, CA), Saint Jeanne De Lestonnac School (16791 E. Main Street, Tustin, CA) 0.25 miles east, Raymond A. Villa Fundamental Intermediate School (1441 E. Chestnut Avenue, Santa Ana, CA) 0.25 miles west, Robert Heideman Elementary School (15571 Williams Street, Tustin, CA) 0.4 miles south, Reach Academy (1325 E. 4th Street, Santa Ana, CA) 0.7 miles northwest, and surrounding residential areas, especially south of E. Main Street. However, the Project will not exceed the Regional Significance Threshold for criteria pollutants. As a result, the impact on nearby sensitive receptors is expected to be less than significant with mitigation measure AIR-1. d) Project construction equipment and activities, including diesel exhaust emissions, could generate odors. There may be situations where construction activity odors would be noticeable by persons working at or visiting nearby facilities, but these odors would not be unfamiliar or objectionable. In addition, these odors would be temporary and would dissipate rapidly from the source with an increase in distance. There are no long-term odors anticipated from the construction of the Project. Because there may be short-term odors as a result from the temporary construction of the Project, impacts will be less than significant. Mitigation Measures: AIR-1 – Pursuant to Rule 403 of the SCAQMD, the following dust minimizing measures shall be implemented: ➢ City of Santa Ana and its designees shall comply with all applicable SCAQMD Rules and Regulations, including Rule 403 ensuring the cleanup of construction-related dirt on approach routes to the site. Rule 403 prohibits the release of fugitive dust emissions from any active operation, open storage pile or disturbed surface area visible beyond the property line of the emission source. ➢ City of Santa Ana and its designees shall comply with all SCAQMD established minimum requirements for construction activities to reduce fugitive dust and PM10 emissions. ➢ Adequate water techniques shall be employed to mitigate the impact of construction -related dust particulates. Portions of the site that are undergoing surface earth moving operations shall be dewatered such that a crust will be formed on the ground surface, and then watered again at the end of each day. Site watering shall be performed as necessary to mitigate blowing dust. City Council 15 – 65 12/2/2025