75B - PH - RESO FOR EIR WARNER AVE WIDEN

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relocation of the bus stop at Standard Avenue and Warner Avenue due to the proposed buck turn-out for Cherry Aerospace. Finding: Changes or alterations have been required in or incorporated into the project that avoid or substantially lessen the significant environmental effect identified in the Final EIR. These changes are identified in the form of a mitigation measure, presented above. Impact 5.10 -7 would be less than significant with mitigation. The City of Santa Ana hereby finds that implementation of the mitigation measure is feasible, and it is therefore adopted. B. SIGNIFICANT UNAVOIDABLE IMPACTS The following summary describes the unavoidable impacts of the proposed project where mitigation measures were found to be infeasible, or they would not reduce impacts to less than significant. The following impact would remain significant and unavoidable. Noise Impact 5.8 -3 Construction activities would substantially elevate noise levels in the vicinity of noise - sensitive land uses for an extended duration. Facts in Support of Finding: Support for this environmental impact conclusion is fully discussed starting on page 5.8 -19 of Section 5.8, Noise, of the Draft EIR. Short -term noise would be associated with the site preparation, grading, and building construction of the proposed road widening. While the magnitude of the noise would, at times, be up to 86 dBA Ley, it would fluctuate throughout the workday because equipment would not be in use at one location for an extended period of time. Operation of heavy earthmoving equipment has the potential to substantially elevate noise levels at nearby residential areas for an extended duration over several months; construction noise is considered significant. Mitigation Measures N -1 Prior to final engineering plan approval, when detailed roadway alignment, landscape plans, and elevations are available, a final noise study shall be prepared to identify specific sound wall locations along receptors that would be significantly impacted by the project. With current information significantly affected properties are listed in Table 5.8 -12. Figure 5.8 -2 shows the sound wall locations and heights that would reduce noise impacts to levels below significance. For aesthetic purposes, the City can use the alternative wall location shown on Figure 5.8 -2; however, one of the two wall locations is required to provide sound attenuation to meet City of Santa Ana noise standards. Sound walls shall be solid from the ground to the top with no decorative cutouts and shall weigh at least 3.5 pounds per square foot of face area. The sound walls may be constructed using masonry block, '/a -inch thick glass, or other transparent material with sufficient weight per square foot. The need, location, and height of sound walls /walls shall be determined based on the conclusions of the final acoustical report and the final pad elevations of the grading plan. All walls determined to be necessary for noise mitigation by the final acoustical report shall be incorporated into the final roadway construction plans. N -2 The use of vibratory rollers shall be prohibited within 30 feet of a residential CEQA Findings of Fact - 11 - Warner Avenue Improvements & Widening from Main Street to Grand Avenue Aug 2015 75B -23