§ 50-64. Tables of noise level limits.

(a)

Table I.

(1)

Table I specifies noise level limits in dBA which if exceeded will have a high probability of producing permanent hearing loss in anyone in the area where the noise levels are being exceeded. No noise shall be permitted within the city which exceeds in duration or noise level that as stated in table I as follows:

TABLE I: Permissible Noise Exposures
Duration per Day, Continuous Hours	Noise Level dBA
8	90
6	92
4	95
3	97
2	100
1½	102
1	105
½	110
¼ or less	115

 

(2)

When the daily noise exposure is composed of two or more periods of noise exposure at different levels, their combined effect shall be considered, rather than the individual effect of each. If the sum of the following fractions: C1/T1 + C2/T2 . . . Cn/Tn exceeds unity, the mixed exposure shall be considered to exceed the noise level limit value. Cn indicates the total time of exposure at a specified noise level, and Tn indicates the total time of exposure permitted at that level.

(3)

If the device producing the noise whose noise levels are in excess of Table I cannot be toned down so that the noise levels are less than those in Table I, protection should be provided for those in the area of the noise. The protection must reduce the noise level to below the limits of Table I and must not, itself, produce a safety hazard. Procedures must exist that guarantee that the people in the area of the noise will use the protection.

(b)

Table II. Tables IIA and IIB specifies noise levels that represent limits that if exceeded interfere with the peace, quiet and general welfare of the city and its inhabitants. No noise shall be permitted within the city that exceeds the noise level limits of table II except as expressly authorized by this article.

TABLE IIA: Maximum Allowable Noise Level Limits in dBA for Residential Occupancies
Time of Day	Noise Level dBA
Day (7:00 a.m. to 10:00 p.m.)	61
Night (10:00 p.m. to 7:00 a.m.)	55

 

TABLE IIB: Maximum Allowable Noise Level Limits in dBA for Commercial and Manufacturing Occupancies
Time of Day	Noise Level dBA
Day (7:00 a.m. to 11:00 p.m.)	66 (Commercial) 71 (Manufacturing)
Night (11:00 p.m. to 7:00 a.m.)	60 (Commercial) 65 (Manufacturing)

 

These levels may not be exceeded in any one single incident if the single incident represents a part of the normal operation of the facility.

(Code 1986, § 17-3; Ord. No. 960, § 1, 7-6-2010)