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Section 5 <br />Alternative 3: Reduced Intensity Alternative <br />Under Alternative 3, the three proposed injection wells and monitoring well would <br />Sae located within underground vaults. The operation of the injection wells and <br />monitoring well would not emit any long term operation noise that would be in <br />excess of City of Santa Ana noise standards. The construction operations for <br />Alternative 3 would temporary increase noise levels within the project area. As <br />shown in the noise analysis, with the incorporation of the sound walls and <br />compliance with the City's Noise Ordinance, construction related noise impacts <br />generated from Alternative 3 would not expose sensitive receptors to noise levels <br />in excess of City of Santa Ana day noise standards. <br />Alternative 4: Pipeline Design Alternative <br />Under Alternative 4, the four proposed injection wells and monitoring well would <br />be located within underground vaults. The operation of the injection wells and <br />monitoring well would not emit any long term operation noise that would be in <br />excess of City of Santa Ana noise standards. The construction operations for <br />Alternative 4 would temporary increase noise levels within the project area. As <br />shown in the noise analysis with the incorporation of the sound walls and <br />compliance with the City's Noise Ordinance, construction, related noise impacts <br />generated from Alternative 4 would not expose sensitive receptors to noise levels <br />In excess of City of Santa Ana noise standards. <br />Mitigation Measures <br />N-1: The project will incorporate the noise reduction design features identified in <br />the Mid Basin Centennial Park Injection Well Project EIR, <br />Level of Impact <br />Alternative 1: No adverse impact <br />Alternative 2: Less than significant adverse impact with Mitigation Measure N-1. <br />Alternative 3. Less than significant adverse impact with Mitigation Measure N-1. <br />Alternative 4: Less than significant adverse impact with Mitigation Measure N-1, <br />IMPACT N-2: Would the project result in a substantial temporary or periodic <br />increase in ambient noise levels in the project vicinity above levels existing <br />without the project? <br />Alternative 1: No Federal Action/Nlo Project <br />Under Alternative 1, the project construction activities and well redevelopment <br />activities would not occur. There would not be any construction related temporary <br />increases in the ambient noise level within the project area. <br />Mid Basin Centennial Park I%&f 5-211 <br />2 _ ffroject Final EIR <br />