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Section 5 <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-3: Would the project result in a permanent increase in ambient <br />noise levels in the project vicinity above levels existing without the <br />project? <br />Alternative 1: No Federal Action/No Project <br />Under Alternative 1, the project would not be implemented, There Would no <br />permanent increases to ambient noise levels within the project area and land <br />uses surrounding the project area. The project area and surrounding land uses <br />would continue to experience elevated levels of noise. <br />Alternative 2: Proposed Project <br />Under Alternative 2, 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 noise that would permanently increase <br />arnbient noise levels within the project area. The maintenance of the wells would <br />occur during the day over a two week period and would be conducted in <br />accordance with the City of Santa Ana Noise Ordinance; There would not be a <br />permanent increase in ambient noise levels within the project area. Potential long <br />term noise impacts would be less than significant. <br />Alternative 3: Reduced Intensity Alternative <br />Under Alternative 3, the three injection wells and monitoring well Would be <br />located within underground vaults. Similar to the Proposed Project, the operation <br />and redevelopment of the injection wells and monitoring well would not <br />permanently increase ambient noise levels within the project area. Potential long <br />term noise impacts would be less than significant. <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. Similar to the Proposed Project, the <br />operation and redevelopment of the injection wells and monitoring well would not <br />permanently increase ambient noise levels within the project area. Potential long <br />term noise impacts would be less than significant. <br />Mitigation Measures <br />No Mitigation measures are required <br />Level of Impact <br />Alternative 1: No adverse impact <br />Mid Basin Centennial Park rl- Project Final EiR 5-213 <br />