31B - CUP - 1901 NORTH FAIRVIEW ST

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City of Santa Ana Environmental Checklist c, Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is a nonattainment area for an applicable federal or state ambient air quality standard (including releasing emissions that exceed quantitative thresholds for ozone precursors)? s)? Less- than - Significant Impact The SCAQMD's approach for assessing cumulative impacts is based on the AQMP forecasts of attainment of ambient air quality standards in accordance with the requirements of the federal and state Clean Air Acts. As discussed earlier in III.a., the proposed project would be consistent with the AQMP, which is intended to bring the Basin into attainment for all criteria pollutants.2 In addition, the mass regional emissions calculated for the proposed project presented earlier in Table 3 -6 (regional construction emissions) and Table 3 -7 (regional operations emissions) are less than the applicable SCAQMD daily significance thresholds, which factor in cumulative effects and are designed to assist the region in attaining the applicable state and national ambient air quality standards. As such, cumulative impacts would be less than significant, and no mitigation measures would be necessary. d. Expose sensitive receptors to substantial pollutant concentrations? Less - than - Significant Impact. The proposed project would contribute to localized air pollutant emissions during construction (short -term) and project operations (long- term). A discussion of the project's localized potential construction- and operations- period air quality impacts is provided below. Local Construction Impacts SCAQMD has developed a set of mass emissions rate look -up tables that can be used to evaluate localized impacts that may result from construction - period emissions. if the onsite emissions from proposed construction activities are below the Localized Significance Threshold (LST) emission levels found in the LST mass rate look -up tables for the project site's SRA, then project emissions would not have the potential to cause a significant localized air quality impact. As discussed previously, mass daily emissions during construction were compiled using the CaIEEMod emissions inventory model. However, only onsite construction emissions were considered for purposes of comparison with the LST mass rate look -up tables (consistent with SCAQMD LST Guidelines, offsite delivery /haul truck activity and employee trips were not considered in the evaluation of localized impacts). A conservative estimate of the project's construction- period onsite mass emissions is presented in Table 3 -8. As provided in Table 3 -8, construction - related daily (short -term) emissions for the worst -case scenarios during which emissions from construction components that overlap would exceed the SCAQMD regional significance thresholds for PM2.5 in Phase I. However, implementation of Mitigation Measures AQ -1, AQ -2, and AQ -3 will reduce short -term construction emissions to a less- than - significant level. As 2 CEQA Guidelines Section 15064(h)(3) states "A lead agency may determine that a project's incremental contribution to a cumulative effect is not cumulatively considerable if the project will comply with the requirements in a previously approved plan or mitigation program which provides specific requirements that will avoid or substantially lessen the cumulative problem (e.g., water quality control plan, air quality plan, integrated waste management plan) within the geographic area in which the project is located. Such plans or programs must he specified in law or adopted by the public agency with jurisdiction over the affected resources through a public review process to implement, interpret, or make specific the law enforced or administered by the public agency." The Academy Charter High School June 2012 Initial Study /Mitigated Negative Declaration 3 -25 ICF00914.11 31 B -101