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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />7. Alternatives to the Proposed Project <br />7.5.2 Air Quality <br />This alternative would reduce both construction and operational emissions of the proposed project due to <br />the reduction in permitted development intensity. However, it is expected that emissions of some air <br />pollutants would remain above regional thresholds. An quality impacts of this alternative would remain <br />significant and unavoidable. <br />7.5.3 Cultural Resources <br />This alternative and the proposed project would both permit redevelopment of the Harbor Corridor Plan <br />area. Although depths of grading and excavation could be slightly reduced in this alternative due to decreased <br />permitted building heights, cultural resources impacts of this alternative would be similar to those of the <br />proposed project. As under the proposed project, potential impacts to cultural resources would remain less <br />than significant with mitigation. <br />7.5.4 Geology and Soils <br />Geology and soils impacts of this alternative, including impacts related to liquefaction, soil subsidence, and <br />soil expansion, would be similar to those of the proposed project; both scenarios would permit <br />redevelopment of the Harbor Corridor Plan area. Therefore, potential impacts related to geology and soils <br />would remain less than significant. <br />7.5.5 Greenhouse Gas Emissions <br />Greenhouse gas emissions would be reduced by this alternative due to the reduction in permitted <br />development intensity. As under the proposed project, impacts related to greenhouse gas emissions would be <br />less than significant. <br />7.5.6 Hazards and Hazardous Materials <br />Hazards and hazardous materials impacts of this alternative would be slightly reduced compared to those of <br />the proposed project due to the lower numbers of residents that could be exposed to hazardous materials <br />which could be present in site soils. Hazards and hazardous materials impacts of the proposed project would <br />be less than significant after implementation of mitigation. <br />7.5.7 Hydrology and Water Quality <br />This alternative would result in a similar amount of impervious surfaces as the proposed project. No changes <br />to the volume or velocity of stormwater would occur because the project area is built out and the area of <br />impervious surfaces is not expected to change. Short -term construction related and long -term water quality <br />would be similar to the proposed project since future projects under this alternative would be required to <br />comply with the Construction General Permit, requiring implementation of a Storm Water Pollution <br />Prevention Plan (SWPPP) for projects one acre in size or more, and prepare a Water Quality Management <br />October 2014 Page 7 -9 <br />