2014-028 - Approving General Plan Amendement No. 2014-01

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City of Santa Ana -Park View at Town and Country Manor Draft EIR Impact Analysis The CEQA Guidelines indicate that a significant impact would occur if the project would violate any air quality standard or contribute substantially to an existing or projected air quality violation. The South Coast Air Basin, the geographical area in which the project is located, is in nonattainment for PM,,, PM,.,, and ozone. Levels of PM, and PM,., are locally high enough that contributions from new sources may add to the concentrations of those pollutants and contribute to a projected air quality violation. Although background levels of ozone are high in the basin, the project alone (without other cumulative sources) would not contribute substantially to a projected air quality violation of ozone. Two criteria are used to assess the significance of this impact: 1) the localized construction analysis (see Impact 4.2.2); and 2) the CO hotspot analysis (see Impact 4.2.3). The localized construction analysis uses thresholds that represent the maximum emissions for a project that would not cause or contribute to an exceedance of the most stringent applicable national or State ambient air quality standard. These LSTs are specific to each source receptor area. If the project results in emissions that do not exceed those thresholds, it follows, that it would not cause or contribute to a local exceedance of the standard. The localized construction analysis demonstrates that without mitigation, the project would not exceed the localized thresholds for CO. However, concentrations of nitrogen dioxide, PM,,, and PM2.5 would exceed the LSTs within a 50 meter radius of the project. Therefore, according to this criterion, the air pollutant emissions during construction would result in a significant impact and could result in a localized air quality standard violation for nitrogen dioxide, PM,,, and/or PM2.S. A CO hotspot analysis is the appropriate tool to determine if project emissions of CO during operation would exceed ambient air quality standards. The main source of air pollutant emissions during operation are from offsite motor vehicles traveling on the roads surrounding the project site. The CO hotspot analysis demonstrated that project emissions of CO during operation along with emissions from other foreseeable projects in the area would not result in an exceedance of the most stringent ambient air quality standards for CO. Therefore, according to this criterion, air pollutant emissions during operation are considered a less than significant impact. In summary, emissions during construction could result in a localized air quality standard violation; therefore, this impact is potentially significant. Level of Significance Before Mitigation Potentially significant. Mitigation Measures Mitigation measures AQ -1, AQ -2, and AQ -3 are required. Michael Brandman Associates 4.2 -25 H\Cl t(PN- Rnb327b32]003MMVB2]0030 Se 4GAvQ ity.DOc