§ 16-183. Limitations on environmental sound levels.
It shall be a violation of this article for any person to operate or permit to be operated any stationary source of sound which creates a unit percentile sound level (L 1 ) greater than 15 dbA above the ambient sound pressure level (L 90 ) as set forth in the table below in any residential use zone, or creates a tenth percentile sound level (L 10 ) or a 90th percentile sound level (L 90 ) which exceeds the limits set forth in the table below for the receiving land use districts when measured at the property boundary. For the purpose of enforcing these provisions, a measurement period shall not be less than ten minutes or more than 30 minutes.
Limiting Sound Levels
(in dbA)Land Use District Tenth Percentile
(L 10 )Ambient, or
90th Percentile
(L 90 )Residential: 7:00 a.m.—10:00 p.m. 65 55 10:00 p.m.—7:00 a.m. 60 50 Commercial/Agricultural: 7:00 a.m.—10:00 p.m. 72 62 10:00 p.m.—7:00 a.m. 67 57 Industrial: 7:00 a.m.—10:00 p.m. 85 75 10:00 a.m.—7:00 a.m. 85 75 When a noise source can be identified and its noise measured in more than one land use category, the limits of the most restrictive shall apply at the boundary and within the most restrictive land use category.
(Code 1982, § 18-5(e); Ord. of 10-5-1953, § 2; Ord. No. 91-31, § 1, 8-19-1991; Ord. No. 95-6, § 1, 3-20-1995; Ord. No. 03-19, § 1, 7-7-2003; Ord. No. 05-45, § 1, 10-3-2005; Ord. No. 09-21, §§ 1, 2, 5-4-2009)