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