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09/09/2013 Both existing and projected noise levels throughout much of the Precise Plan area, especially in the vicinity of U.S. 101, exceed 55 dBA CNEL, thereby potentially exposing the proposed child care center to noise levels exceeding the "normally acceptable"threshold. Mitigation: Mitigation 13-1. Location-specific noise studies consistent with the requirements of the State Building Code (SBC) shall be conducted for the proposed child care use to identify appropriate noise reduction measures to be included in project final design. The noise study must be submitted to and approved by the Redwood City Community Development Department prior to City issuance of the child care center building permit. Identified noise insulation measures may include: ■ Site planning to minimize noise by locating the child care center away from U.S. 101, with buffering from roadway noise provided by other project buildings; ■ Air conditioning throughout the child care center so that windows can remain closed to maintain interior noise levels below 45 dBA CNEL; and ■ Sound-rated windows and construction methods if necessary to maintain interior noise levels below 45 dBA CNEL. For child care center outdoor use areas, noise levels at the property line should be maintained at a CNEL not in excess of 55 dBA during operating hours. Although existing and future noise levels measured along roadways in the project vicinity exceed 55 dBA CNEL, noise levels in outdoor activity areas could be reduced from roadside levels by at least 20 dBA through site selection and site design, including buffer areas, siting the building as an effective noise barrier for adjacent traffic noise sources, and, or in combination with, other noise barriers. The approval of future commercial uses near the child care center may, at City discretion, require a noise study demonstrating how the proposed new commercial uses--including associated loading docks, refuse areas, ventilation systems, and emergency generators--would meet these standards. Finding: Implementation of Mitigation 13-1 would reduce the potential noise impact on the proposed child care use to a less-than-significant level. Facts in Support of Finding: Implementation of Mitigation 13-1 would reduce noise impacts on the proposed child care center to a less-than-significant level by requiring site planning and noise insulation that results in a noise level of not more than 55 dBA CNEL in the child care outdoor use areas during operating hours, and 45 dBA CNEL in interior areas. These facts are described and quantified in Draft EIR chapter 13 (Noise) on pages 13-1 through 13-20, which is hereby incorporated by reference. Impact: Impact 13-2: Project-Facilitated Construction Noise. Construction activities facilitated by the project would include building demolition, site grading and preparation, construction of new buildings, and installation of utilities. Noise levels at 50 feet from the demolition or construction equipment source could ATTY/RES0.2901/STANFORD EIR CERTIFICATION RESO.#15294 REV:09-10-13 VR MUFF#100 Page 22 of 55