(A) Intent:
1. Public Health And Safety: Noise hazard provisions are intended to protect public health and safety by identifying high noise areas in the city and establishing regulations to mitigate those identified high noise levels.
2. Applicability: The noise hazard provisions shall be applied to those areas where the projected community noise equivalency level (CNEL) is sixty five (65) decibels (dBA) or greater.
(B) Development Standards:
1. Residential Land Use Areas: When a land use application or development permit is proposed within the sixty five (65) dBA CNEL noise contour and such a proposed use or noise associated with such a use is adjacent to a residential zone district or residential use, the following standards shall apply:
(a) Noise levels shall be identified. An acoustical report shall be performed to identify noise impacts and any recommendation for noise attenuation or other mitigation measures to be incorporated into the design standards or conditions of approval as applicable.
(b) Interior noise levels in residences, dwelling units and educational institutions shall not exceed forty five (45) dBA CNEL emanating from sources outside the affected building.
(c) Exterior noise levels in residential land use areas shall not exceed sixty five (65) dBA CNEL.
(d) Ability to mitigate exterior noises to the levels of sixty five (65) dBA CNEL shall be considered by the reviewing authority when determining the actual CNEL level with which the land uses must comply.
(e) In areas where noise exceeds the noise standard, steps shall be taken to mitigate noise levels. An acoustical report identifying mitigation measures shall be required and reviewed by environmental health services department prior to issuance of any required development permits or approval of land use applications.
2. Other Structures: All other structures shall be sound attenuated against the combined input of all present and project exterior noise to not exceed the following criteria:
Typical Uses | 12 Hour Equivalent Sound Level (Interior) dBA |
Educational institutions, libraries, churches | 45 |
General office, reception | 50 |
Retail stores, restaurants | 55 |
Other areas for manufacturing assembly, test, warehousing | 65 |
3. Maximum Average Level: In addition, the average of the maximum levels on the loudest of intrusive sounds occurring during a twenty four (24) hour period shall not exceed sixty five (65) dBA interior. (Ord. 805-14, 7-1-2014)