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Responses to <br />Environmental Checklist <br />For CEQA Compliance <br />to the operation of proposed pumps. Such operations would occur below ground <br />and would be fully contained within a solid concrete building. Noise attenuation <br />afforded by the proposed structure, along with natural attenuation associated <br />with the below-ground nature of the noise generating source, would preclude the <br />exposure of nearby sensitive receptors to unacceptable noise levels. <br />Accordingly, impacts are evaluated as less than significant. <br />B. Exposure of persons to or genera#ion of excessive groundborne vibration or <br />groundborne noise levels? <br />Finding: Less than Significant Impact. <br />Analvsis: Construction activities associated with the proposed project are not anticipated to <br />result in the generation of substantial groundborne vibration or groundborne <br />noise levels. Solis in the project area are silty in nature, and blasting or rock <br />crushing would not be necessary. Any groundborne vibration resulting from <br />project construction would be temporary in nature and would cease upon <br />completion of the proposed improvements. Therefore, near-term ground-borne <br />noise and vibration impacts are evaluated as less than significant. <br />Long-term operation of the proposed lift station likewise would not produce <br />excessive groundborne vibration or noise levels. Although equipment proposed <br />as part of the lift station would generate noise, the noise levels would not <br />produce groundborne vibration. Any noise associated with operation of the <br />facility would be attenuated by the proposed solid concrete and grouted block <br />building which will house the noise-generating equipment. Therefore, long-term <br />operation of the proposed project would not result in any noise or vibration <br />impacts. <br />C. A substantial permanent increase in ambient noise levels in the project vicinity <br />above levels existing without fhe project? <br />Finding: Less than Significant fimpact. <br />Analvsis: Please refer to the discussion of Issue XI.A, above. As indicated, long-term <br />operation of the proposed facility would not result in a substantial increase in <br />noise volumes because the proposed grouted block structure would attenuate <br />most of the noise associated with the proposed mechanical equipment. In <br />addition, the site is located adjacent to Segerstrom Avenue, which is a high- <br />volume roadway and would remain the primary noise-generating activity in the <br />project area. As such, long-term operation of the proposed lift station would not <br />result in a substantial permanent increase in ambient noise levels in the project <br />vicinity above levels existing without the project. <br />D. A substantial temporary or periodic increase in ambient noise levels in the project <br />vicinity above levels existing without project? <br />Findin Less than Significant Impact. <br />Page 54 of 64 <br />75E-58 <br />