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City of Santa Ana <br />Environmental Checklist <br />selection based on information provided in the TIA prepared by Fehr & Peers (Appendix C). Because <br />no intersections met the criteria necessary for a quantitative analysis, the project activity would not <br />have a significant impact upon 1- or 8 -hour local CO concentrations from mobile source emissions. <br />Thus, operation of the project would not result in significant impacts related to 1- or 8 -hour local CO <br />concentrations from mobile source emissions. <br />Because significant impacts would not occur at any intersections located adjacent to sensitive <br />receptors, no significant impacts are anticipated to occur at any other locations in the study area <br />because the conditions yielding CO hotspots would not be worse than those occurring at the <br />analyzed intersections. Consequently, the sensitive receptors that are included in this analysis <br />would not be significantly affected by CO emissions generated by the net increase in traffic that <br />would occur under the project. Because the project does not cause an exceedance, or exacerbate an <br />existing exceedance of an ambient air quality standard, the project's localized operational air quality <br />impacts would be less than significant. No mitigation measures are necessary. <br />With respect to the project's onsite mass emissions, Table 3 -10 shows that onsite operations- period <br />emissions would be below SCAQMD's localized significance thresholds. Impacts from emissions of <br />these criteria pollutants would be less than significant. No mitigation measures are necessary. <br />Toxic Air Contaminants <br />SCAQMD recommends that health risk assessments be conducted for substantial sources of diesel <br />particulate emissions (e.g., truck stops and warehouse distribution facilities) and has provided <br />guidance for analyzing mobile source diesel emissions. In addition, typical sources of acutely and <br />chronically hazardous TACs include industrial manufacturing processes, automotive repair facilities, <br />and dry cleaning facilities. Since the proposed project would not contain such uses, the proposed <br />project does not warrant a health risk assessment. Potential project - generated air toxic impacts on <br />surrounding land uses would be less than significant. No mitigation measures are necessary. <br />Table 3 -10. Estimate of Operation- Period Localized (Onsite) Emissions <br />NOx CO PM10 PM21S <br />Onsite Area Source Emissions Phase la <1 4 <1 <1 <br />Onsite Area Source Emissions Phase 1 & Ila <1 4 <1 <1 <br />SCAQMD Daily Significance Threshold (lbs /day)b 183 1253 5 2 <br />Exceed Significance Threshold? No No No No <br />Notes: <br />I Onsite emissions calculated using the CalEEMod emissions model (area - source emissions). Model <br />output sheets are provided in Appendix A. <br />b'rhe project site is located in SCAQMD SRA 17. These LSTs are based on the site location SRA, distance <br />to the nearest sensitive- receptor location from the project site (25 meters), and the project area <br />(5 acres). <br />Source:1CF 2012. <br />e. Create objectia â–ºable odor s affectilug a substantial number of people? <br />Less - than - Significant Impact. According to the SCAQMD CEQA Air Quality Handbook, land uses <br />associated with odor complaints typically include agricultural uses, wastewater treatment plants, <br />food processing plants, chemical plants, composting, refineries, landfills, dairies, and fiberglass <br />The Academy Charter High School 3 28 June 2012 <br />Initial Study /Mitigated Negative Declaration ICF 00914.11 <br />MWally <br />