(A) No Industrial District (I) and C-1, C-2 and C- 3 Commercial District uses shall generate noise that tends to have an annoying or disruptive effect upon uses located outside the immediate space occupied by the I, C-1, C-2 and C-3 district uses if those uses be one of several located on a lot or uses located on adjacent lots.
(B) Except as provided in division (F), the table set forth in division (E) establishes the maximum permissible noise levels for I, C-1, C-2 and C-3 district uses. Measurements shall be taken at the boundary line of lot where those uses are located, and, as indicated, the maximum permissible noise levels vary according to the zoning of the lot adjacent to the lot on which the district uses identified in division (A) are located.
(C) A
DECIBEL is a measure of a unit of sound pressure. Since sound waves having the same decibel level “sound” louder or softer to the human ear depending upon the frequency of the sound wave in cycles-per-second (i.e., whether pitch of the sound is high or low), and A-weighted filter constructed in accordance with the specifications of the American Standards Institute, which automatically takes account of the varying effect on the human ear of different pitches, shall be used on and sound level meter taking measurements required by this section. And accordingly, all measurements are expressed in db(A) to reflect the use of this A-weighted filter.
(D) The standards established in the table set forth in division (E) are expressed in terms of the Equivalent Sound Level (Leq), which must be calculated by taking 100 instantaneous A-weighted sound levels at 10-second intervals.
(E) Table of Maximum Permitted Sound Levels, dB(A).
(re: 0.0002 Microbar)
Zoning of Lot Zoning of Adjacent Lot
Where Use
Located R-1, R-2, R-3, RC C-1, C-2, C-3 I
Located R-1, R-2, R-3, RC C-1, C-2, C-3 I
(A)* (B)* (A)* (B)* (A)* (B)**
I 65 55 70 60 75 70
C-1, C-2, C-3 65 55 70 60 70 60
* 7:00 a.m. to 10:00 p.m. ** 10:00 p.m. to 7:00 a.m.
(F) SPIKE NOISES are sounds that occur intermittently rather than continuously. Spike noises generated by sources that do not operate more than one minute in any one-hour period are permissible up to a level of 10 db(A) in excess of the figures listed in division (E), except that this higher level of permissible noise shall not apply from 10:00 p.m. to 7:00 a.m. when the adjacent lot is zoned residential. The impact noise shall be measured using the fast response of the sound level meter.
(Ord. 250-8-88, passed 8-15-88) Penalty, see § 90.99