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7A Page 44 • Investigate in consultation with City staff possible pre-drilling of pile holes as a means of minimizing the number of percussions required to seat the pile. Finding: Implementation of these measures would reduce this potential intermittent and short-term Precise Plan vibration impact to a less-than- significantlevel. Impact 11-3: Potential Exposure of New, Precise Plan-Facilitated Noise-Sensitive Development to Noise Levels Exceeding Standards. The proposed Precise Plan would facilitate new residential development in downtown Redwood City. Associated new residents, employees, and visitors could be exposed to various existing and projected noise sources, including traffic and Caltrain operations. The compatibility of the Draft Precise Plan proposed land uses with the existing and projected noise environment has been evaluated based on the Redwood City Noise Guidelines for Land Use Planning {see EIR Table 11.4). New residential development is considered normally acceptable in noise environments of less than 55 dBA CNEL, and new commercial or retail development is considered normally acceptable in noise environments of 70 dBA CNEL or less. Future noise levels throughout much of the Precise Pian area, especially in the vicinity of the Caltrain line, would exceed 55 dBA CNEL. Land uses proposed within 250 feet of the Caltrain line, 120 feet from the centerline of EI Camino Real, or 900 feet from Veterans Boulevard, would be exposed to noise levels of 70 dBA CNEL or higher, thereby exposing new Precise Plan- designated, noise-sensitive residential, commercial, recreational, and public facility land use development to noise levels exceeding the "normally acceptable" threshold. These possible long-term adverse noise effects would represent a pofentially significant impacf. finitigation ~ 1-3. Site-specir"ic noise studies consistent wiih the requirements of the State Building Code {SBC) shall be conducted for all new Precise Plan-facilitated residential uses in these identified potential land use/noise compatibility impact areas to identify appropriate noise reduction measures to be included in project final design. Each noise study must be submitted to and approved by the Redwood City Building Department prior to City issuance of a residential building permit. Identified noise insulation measures may include: • Site planning to minimize noise in shared residential outdoor activity areas by locating the areas behind the buildings, in courtyards, or orienting the terraces to alleyways rather than streets, whenever passible; • Air conditioning in al! units so that windo::~s can remain closed to maintain interior noise levels below 45 dBA CNEL; and • Sound-rated windows and construction methods in residential units proposed along streets (or the Caltrain line) where noise levels would exceed 70 dB CNEL. Atty/Reso/Resa.1663 27 03o7Q7