Reso13 PC 13-09 2859 Initial Study Mitigated Negative Declaration Kensington

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by unit basis. Results of the analysis,including the description of the necessary noise control treatment,will be submitted to the City along with the building plans and approved prior to issuance of any building permits. MM NOI 1-2: All residential units will be equipped with forced-air mechanical ventilation so that windows can be kept closed at the discretion of the residents. MM NOI 1-3: All noise insulation treatments determined to be required during review of the final site plans will be incorporated into the proposed project. Airport Related Noise The proposed project is not located within two miles of any public or private airport and is outside the noise contours for San Carlos Airport. The project will not expose future residents to excessive noise levels caused by aircraft flyovers. (No Impact) 4.12.3.2 Noise Impacts from the Project Traffic Related Noise Implementation of the proposed project would not substantially increase traffic noise levels in the project area. Typically,in high noise environments,if the project would cause ambient noise levels to increase by more than 3 dBA at noise-sensitive receptors,the impact is considered significant. For a perceptible increase(3 dBA)in ambient noise level,traffic trips need to double in the project area. Based on traffic projections presented in the transportation impact analysis (see Section 4.16),traffic generated by the proposed project would result in a noise level increase of less than one decibel in the project area. Since the proposed project will not cause an increase in noise levels in the project area of three decibels or more,it will have a less than significant long-term noise impact on the nearby residential land uses. (Less Than Significant Impact) Parking Lot and Operational Noise The proposed 27-space surface parking lot will be located adjacent to the western boundary of the project site,near the adjacent residences. Major noise sources associated with parking lots include automobile engines, door slams, and occasional car alarms or horns. It is reasonable to assume that parking lot activity will not be disruptive during normal business hours and early evening hours as most persons are typically working and not within their residences during these periods and/or people are more active in their houses and less likely to notice outside noise. Noise sources are most noticeable during late evening/early morning hours when most people are sleeping. The setback between the westernmost parking spaces and the western property line is approximately 10 feet. A 10-foot tall solid fence is proposed between the properties. MaYimum instantaneous noise levels at a distance of 30 feet from typical parking lot activity would range from 54 to 64 dBA and could reach 74 dBA when car alarms sound. When these noise events occur,it would temporarily increase ambient noise levels by five dBA during the day and five to 15 dBA at night at a distance of 30 feet. Kensington Assisted Living Facility Project 70 Initial Study Redwood City Apri12013