2015-015 - Addendum to the Final Environmental Impact Statement /Environmental Impact Report No. 89-01

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ENVIRONMENTAL IMPACT REPORTADDENDUM Bristol Street Widening Phase IIIA— Civic Center Drive to Washington Avenue determine whether or not a project would contribute to air pollutant violations. If a project exceeds the regional air pollutant thresholds, then the project would substantially contribute to air quality violations in the SCAB. In addition, a project would also contribute to air pollutant violations if localized emissions result in an exceedance of the ambient air quality standards (AAQS). Based on the Air Quality Assessment Report performed by URS Corporation (2013a) for the Project, short -tern emissions generated during Project - related construction activities would not exceed the SCAQMD regional emissions thresholds for any of the criteria pollutants and also would not substantially elevate localized concentrations of these pollutants. Consequently, the Project would be consistent with the Air Quality Management Plant (AQMP). Long -tern emissions generated by the Project would not exceed the SCAQMD thresholds for regional emissions and would therefore also not contribute to an increase in frequency or severity of air quality violations. The proposed Project would be consistent with the Major Arterial designation of the City of Santa Ana General Plan Circulation Element and the County of Orange's Master Plan of Arterial Highways. Additionally, the Project would improve traffic flow and result in a reduction in air pollutant emissions. Mitigation Measures No additional new mitigation measures are required. b.) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? Short-tern emissions were modeled for the construction phase of the proposed Project. Construction activities associated with the Project would include demolition of pavement and buildings, fine grading, trenching, paving, and development of ancillary structures. During construction activities, emissions from heavy equipment exhaust, delivery trucks, and fugitive dust would be generated for a short duration. To accurately determine the significance of air quality impacts from construction activities, construction emissions are quantified and compared to the significance thresholds set by the SCAQMD. Project - specific data, such as construction timelines and dimensions of the Project site, along with general operating guidelines, were used as inputs to the SCAQMD's California Emissions Estimator Model (CalEEMOd) (version 2011.1.1) to quantify construction emissions. As shown in Table 2, emissions calculated by this model were compared to the SCAQMD's regional significance thresholds to determine whether project emissions would result in a significant air quality impact. As shown in Table 2, emissions attributable to construction of the proposed Project were found to be below the significance thresholds adopted by the SCAQMD for all the analyzed air pollutants. Because emissions were found to be below the SCAQMD's significance thresholds, Project related constriction emissions are not considered by the SCAQMD to result in a significant air quality impact. In addition, mitigation measures included in the 1990 FEIS /EIR would further reduce construction - related air quality impacts. ANA 305 -011 (PER 02) CITY OF SANTA ANA (0 [/19/2015) YU PAGE 30