Performance standards for noise.
§ 255-790. Performance standards for noise.
A. Existing and proposed industrial uses shall not create noise in excess of the sound pressure levels specified by Subsections D through G.
B. Sound pressure levels shall be measured with a sound-level meter that conforms with the American Standards Specifications for Sound Level Meters for measurement of Noise and Other Sounds, and with an octave bank filter and analyzer that conforms to the American Standard Specifications for an Octave Bank Filter Set for the Analysis of Noise and Other Sounds, Z 24.10-1953.
C. Traffic, aircraft, and other background noises shall not be considered in measuring noise levels except when the background noise is part of the noise being measured.
D. Maximum permissible sound-pressure levels, nighttime operation. Table 7-1 Pre-1960 Octave Band Frequency Preferred Frequency Octave Band Center (Cycles per Second) Decibels Frequency (Cycles per Second) Decibels 0 to 75 72 21.5 76 75 to 100 67 63 71 150 to 300 59 125 65 300 to 600 52 250 57 600 to 1,200 46 500 50 1,200 to 2,400 40 1,000 45 2,400 to 4,800 34 2,000 39 Above 4,800 32 4,000 34
E. Maximum permitted sound-pressure levels daytime operation. Table 7-2 Pre-1960 Octave Bands Octave Frequency (Cycles per Second) Preferred Frequency Octave Bands Octave Band Decibels Center Frequency (Cycles per Second) Decibels 0 to 75 77 21.5 81 75 to 150 72 63 76 150 to 300 64 125 70 300 to 600 57 250 62 Table 7-2 Pre-1960 Octave Bands Octave Frequency (Cycles per Second) Preferred Frequency Octave Bands Octave Band Decibels Center Frequency (Cycles per Second) Decibels 600 to 1,200 51 500 55 1,200 to 2,400 45 1,000 50 2,400 to 4,800 39 2,000 44 Above 4,800 37 4,000 39
F. Pressure levels, impulsive noises and periodic noise. Table 7-3 Pre-1960 Octave Bands Octave Band Preferred Frequency Octave Bands Octave Band Frequency (Cycles per Second) Decibels Center Frequency (cycles per Second) Decibels 0 to 75 67 21.5 71 75 to 150 62 63 66 150 to 300 54 125 60 300 to 600 47 250 52 600 to 1,200 41 500 45 1,200 to 2,400 35 1,000 40 2,400 to 4,800 29 2,000 34 Above 4,800 27 4,000 29
G. Maximum permitted sound-pressure levels, noncontinuous operation. For noncontinuous operation of noise sources, the following adjustments shall be made to the decibel levels specified in § 255-7100D through F to determine the appropriate maximum permissible sound-pressure level.
(1) For noise sources operated less than 20% of any one-hour period, add five decibels.
(2) For noise sources operated less than 5% of any one-hour period, add 10 decibels.
(3) For noise sources operated less than 1% of any one-hour period, add 15 decibels.