PC-2025-16 - Laserfiche WebLink

Hana Japan Restaurant Project Initial Study/Mitigated Negative Declaration 59 May 2025 XIII. NOISE. Would the project result in: Potentially Significant Impact Less-Than- Significant with Mitigation Incorporated Less-Than- Significant Impact No Impact a. Generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies?     b. Generation of excessive groundborne vibration or groundborne noise levels?     c. For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels?     Discussion a. The following sections present information regarding sensitive noise receptors in proximity to the project site, applicable noise standards, the existing noise environment, and the potential for the proposed project to result in noise impacts during project construction and operation. The following terms are referenced in the sections below: • Decibel (dB): A unit of sound energy intensity. An A-weighted decibel (dBA) is a decibel corrected for the variation in frequency response to the typical human ear at commonly encountered noise levels. All references to dB in this report will be A- weighted unless noted otherwise. • Community Noise Equivalent Level (CNEL): The cumulative noise exposure over a 24-hour period. Weighting factors of +5 and +10 dBA are applied to the evening and nighttime periods, respectively, to account for the greater sensitivity of people to noise during those periods. • Average, or equivalent, sound level (Leq): The Leq corresponds to a steady-state A- weighted sound level containing the same total energy as a time varying signal over a given time period (usually one hour). • Day-Night Average Level (Ldn): The average sound level over a 24-hour day, with a +10 decibel weighing applied to noise occurring during nighttime (10:00 PM to 7:00 AM) hours. • Maximum Sound Level (Lmax): The maximum sound level over a given time-period. • Median Sound Level (L50): The sound level exceeded 50 percent of the time over a given time-period. Sensitive Noise Receptors Some land uses are considered more sensitive to noise than others, and, thus, are referred to as sensitive noise receptors. Land uses often associated with sensitive noise receptors generally include residences, schools, libraries, hospitals, and passive recreational areas. Noise sensitive land uses are typically given special attention in order to achieve protection from excessive noise. In the vicinity of the project site, sensitive land uses include the existing single-family residences located south of the project site, approximately 180 feet from the nearest disturbance areas on-site.