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Section 5 <br />Alternative 2: Proposed Project <br />As shown in the noise analysis, the construction activities associated with the <br />Proposed Project would temporary increase ambient noise levels within the <br />project at-ea. The increase in ambient noise levels would vary depending on the <br />construction activity. With the incorporation of sound walls at the injection well <br />sites, the majority of the noise increases would be less than 3 dB and would not <br />be discernible to sensitive receptors in the project area. The most substantial <br />temporary increases in ambient noise level Would be from the construction of the <br />water supply/back flush pipeline along the Centennial Loop Road, the site <br />improvements at Heritage Museum and during well redevelopment activities. To <br />minimize noise impacts during these activities design features have been <br />incorporated into the Proposed Project which would require the construction <br />activity to occur at times when sensitive receptors are not present. With the <br />incorporation of sound walls and design features into the Proposed Project and <br />compliance with the City of Santa Ana Noise Ordinance temporary construction <br />related increases in ambient noise level would be less than significant. <br />Alternative 3: Reduced Intensity Alternative <br />Under Alternative 3 one less injection well and a reduced amount of pipeline <br />would be constructed. Even with less pipeline construction activity, the <br />implernentation of the site improvements at the Heritage Museum and the <br />injection well redevelopment activities wound still result in substantial temporary <br />noise increases. Unlike the Proposed Project, Alternative 3 does not include any <br />design features that would require these activities to occur when sensitive <br />receptors are not present. The temporary construction related noise impacts <br />tinder Alternative 3 would occur during periods when they would be exempt <br />under the City's Noise Ordinance anclJor would not exceed the City Noise <br />Ordinance Standards and Would be a less then significant impact. <br />Alternative 4: Pipeline Design Alternative <br />Under Alternative 4, the amount of construction activity and associated <br />temporary construction related noise impacts would be similar to the Proposed <br />Project and would be less than significant, <br />Mitigation Measures <br />Mitigation Measures N-1 required <br />Level of Impact <br />Alternative 1: No adverse impact <br />Alternative 2: Less than significant adverse impact with Mitigation Measure N-1. <br />Mid Basin Centennial Park c Project Final ElR 5-212 <br />