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B. SIGNIFICANT UNAVOIDABLE ADVERSE IMPACTS <br /> The following summary describes the unavoidable adverse impact of the GPU where mitigation <br /> measures were found to be either infeasible or would not lessen impacts to less than significant. <br /> The following impacts would remain significant and unavoidable. <br /> 1. Air Quality <br /> Impact 5.2-1: The additional population growth forecast for the General Plan Update and <br /> the associated emissions would not be consistent with the assumptions of <br /> the air quality management plan. <br /> Support for this environmental impact conclusion is fully discussed in Section 5.2, Air Quality, <br /> starting on page 5.2-45 of the Updated Draft PEIR. <br /> The GPU would be inconsistent with the South Coast Air Quality Management Plan (AQMP) <br /> because buildout under the GPU would exceed the population estimates assumed for the AQMP <br /> and would cumulatively contribute to the nonattainment designations of the South Coast Air Basin <br /> (SoCAB). Buildout of the GPU would exceed current population estimates for the city, and <br /> therefore the emissions associated with the additional population are not included in the current <br /> regional emissions inventory for the SoCAB. Additionally, air pollutant emissions associated with <br /> buildout of the GPU would cumulatively contribute to the nonattainment designations in the <br /> SoCAB. Therefore, overall, the GPU would be inconsistent with the AQMP. <br /> Incorporation of Mitigation Measure AQ-2 into future development projects for the operation phase <br /> would contribute to reduced criteria air pollutant emissions associated with buildout of the GPU. <br /> Additionally, goals and policies in the GPU would promote increased capacity for alternative <br /> transportation modes and implementation of transportation demand management strategies. <br /> However, due to the magnitude and scale of the land uses that would be developed, no mitigation <br /> measures are available that would reduce operation and construction impacts below South Coast <br /> AQMD thresholds. In addition, the population and employment assumptions of the AQMP would <br /> continue to be exceeded until the AQMP is revised and incorporates the projections of the GPU. <br /> Therefore, Impact 5.2-1 would remain significant and unavoidable. <br /> Mitigation Measure <br /> AQ-2 Prior to discretionary approval by the City of Santa Ana for development projects <br /> subject to CEQA (California Environmental Quality Act) review (i.e., non-exempt <br /> projects), project applicants shall prepare and submit a technical assessment <br /> evaluating potential project operation phase-related air quality impacts to the City of <br /> Santa Ana for review and approval. The evaluation shall be prepared in conformance <br /> with South Coast Air Quality Management District (South Coast AQMD) methodology <br /> in assessing air quality impacts. If operation-related air pollutants are determined to <br /> have the potential to exceed the South Coast AQMD's adopted thresholds of <br /> significance, the City of Santa Ana shall require that applicants for new development <br /> Santa Ana General Plan Update <br /> CE 5T ac an Statement 32 — 60 2 <br /> Of ri ing onsiderations -37- 61 /Rer�0 2 1 <br />