2014-028 - Approving General Plan Amendement No. 2014-01

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CW of Santa Ana -Park View at Town and Country Manor Noise Draft EIR Groundborne Vibration Thresholds Based on the structural damage thresholds established in the Caltrans Transportation- and Construction- Induced Vibration Guidance Manual, the proposed project would create a significant vibration impact if it generated groundborne vibration levels for sensitive receptors in excess of 0.5 PPV during construction and 1.0 PPV during operations. 4.5.5 - Impact Analysis and Mitigation Measures This section discusses potential noise impacts associated with the development of the project. Mitigation measures are provided where necessary. Noise Levels in Excess of Standards Impact 4.5 -1 The project would result in exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies. [CEQA Noise Threshold 11(a)] Impact Analysis This impact discussion analyzes the potential for project construction noise and operational noise to cause noise levels in excess of established City of Santa Ana noise standards. Substantial increases in noise, as determined using guidance issued by Caltrans for substantial noise increases, are analyzed in Impact 4.5 -3. Noise levels in the project area would be influenced by construction activity in the short term and by traffic and community noise in the long term. 69iTT3��R.7F�' Construction noise represents a short-term increase in ambient noise levels. Noise impacts from construction activities associated with the proposed project would be a function of the noise generated by construction equipment, equipment location, the sensitivity of nearby land uses, and the timing and duration of the construction activities. Section 18- 314(1) of the City of Santa Ana Municipal Code exempts noise sources associated with construction, repair, remodeling, or grading of any real property, provided these activities are conducted between 7:00 a.m. and 8:00 p.m. Monday through Saturday. Construction may not occur at anytime on Sunday or a federal holiday. Therefore, although there are no construction standards for noise generation, all construction activity is required to be conducted in accordance with the City of Santa Ana Municipal Code. The existing residences at Buildings A and C of Town and Country Manor would be located adjacent to construction associated with proposed main entrance drive and parking modifications, expanded lobby, and aquatic and wellness center. At a distance of 1 foot (the distance used to calculate the noise level at Buildings A and C), the noise level at the residences would be 122 dB. According to Table 4.5 -1, regular exposure to this noise level over one minute risks permanent hearing loss. The existing residences at Building B of Town and Country Manor would be located 15 feet from 4.5 -10 Michael Bmndman Associates H\Clievt(PN -Rn) 327b327WMDEMVB270030 Sec0 Noi�.