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ATTY/RESO.0035/CC RESO CERTIFYING FINAL EIR – 1548 MAPLE REV: 04-30-18 PR Page 13 of 49 Finding: Implementation of Mitigation Measure AIR-2 would reduce the project- related impacts related to exposing future residents of the project site to toxic air contaminants to a less-than-significant level. Facts in Support of Finding: This mitigation measure appropriately identifies measures in accordance with best management practices to reduce potential TACs and particulate matters indoors and to disclose to potential occupants of the project’s potential long-term health risks related to its proximity to the freeway. NOISE Impact NOI-1: The proposed project and the project variant would locate residential land uses in an area that, based on the City’s Noise and Land Use Compatibility Guidelines, is generally considered an unacceptable noise environment for residential land uses. Mitigation NOI-1: Prior to issuance of building permits, the applicant shall prepare an acoustical study that demonstrates how residential units will meet the habitable room noise insulation standard of 45 dBA CNEL. The residential units shall include design features such as the following, or others approved by the City after review of the acoustical study, to the extent necessary to meet the 45 dBA CNEL standard for each unit: • In order for windows and doors to remain closed, provide mechanical ventilation such as air conditioning. • Install windows and glass doors rated STC 33 or higher in all units within 170 feet of US 101. • Construct exterior walls with a minimum STC rating of STC-46. • Install vent ducts connecting interior spaces to the exterior (i.e., bathroom exhaust, etc.) with at least two 90 degree turns in the duct. • Install windows and doors in an acoustically-effective manner. Install sliding-window panels with an air-tight seal when in the closed position and the window frames caulked to the wall opening around the perimeter with a non-hardening caulking compound to prevent sound infiltration. Install exterior doors with an air-tight seal around the full perimeter when in the closed position. Finding: Implementation of Mitigation Measure NOI-1 would reduce potential impacts related to an unacceptable noise environment for residential land uses to a less-than- significant level. Facts in Support of Finding: This mitigation measure appropriately identifies measures to reduce interior noise that are consistent with best management practices during operation. Implementation of these measures would reduce interior noise to acceptable levels established by the City. Impact NOI-2: Noise from construction activities would result in a substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project. 7.A. - Page 50