Reso PC15-01 PC Reso (3051 ) to Adopt Initial Study-Mitigated Negative Declaration - La Palma

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3.0 Environmental Impact Checklist residential development includes no components that would generate groundborne noise or vibration. The project impacts related to exposing persons to or generating excessive groundborne vibration or groundborne noise levels are less than significant. c) Result in a substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? Less-than-Significant Impact. Construction would be temporary,lasting 16 months, and therefore would not result in a permanent increase in ambient noise levels. The project represents infill development and noise Ievels generated by the project would be similar to the noise generated by the existing residential uses on-site. The project would construct 12 two-story detached,single-family homes in replacement of the 3 existing single- family homes.As previously discussed,the ambient noise level standard for medium/medium- high density residential uses conditionally acceptable is up to 65 dBA and the project site is Iocated in a noise contour that currently experiences exterior traffic noise levels ranging from 55 to 60 dBA. Project traffic would generate 7 AM peak trips and 9 PM peak trips(see Section 3.16, Traffic and Transportation). This incremental amount of peaks trips, during which traffic noise levels would be the greatest, would not result in a substantial permanent increase in noise beyond existing noise levels. The project's traffic noise impacts are less than significant. d) Result in a substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? Less-than-Significant Impact with Mitigation Incorporated.Project construction would result in a temporary increase in ambient noise levels during construction,which is expected to last 16 months.The project site is located in a developed neighborhood surrounded by similar residential uses.The closest sensitive receptor is a two-story apartment building located adjacent to the project site approximately 13 feet southeast from a proposed project structure. Other sensitive receptors also located in close proximity to the project site include:a two-story apartment building located adjacent to the project site approximately 35 feet northwest from a proposed project structure, and single-family residential homes across Kentfield Avenue approximately 50 feet from the project site. As shown in Table 4,construction equipment would generate noise levels ranging from 80 dBA to 88 dBA at 50 feet.Although project construction noise would not exceed to the City's construction noise threshold of 110 dBA at 25 feet,noise generate from project construction would result in a substantial increase in noise levels at surrounding properties that exceed the existing ambient noise level.Mitigation Measure NOI-2 would limit the potential construction noise impacts generated during project construction on surrounding properties. Implementation of Mitigation Measure NOI-2 would reduce potential project construction noise impacts to a less-than-significant level. La Palma Subdivision Project Final Initial Study/Mitigated Negative Declaration 51