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03/27/2007 conditions in individual project demolition and construction contractor agreements that stipulate the following ground-borne vibration abatement measures: • Restrict vibration-generating activity to between the hours of 7:00 AM and 7:00 PM, Monday through Friday. Prohibit such activity on weekends and holidays. • Notify occupants of land uses located within 200 feet of pile-driving activities of the project construction schedule in writing. • 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 Plan 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 100 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 potentially significant impact. Mitigation 11-3. Site-specific noise studies consistent with 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: Atty/Reso/Reso.1683 27 14769 030707 Muff #613