509.11  INDUSTRIAL NOISE.
   (a)    In any industrial or commercial zoning districts inclusive, at no point on the boundary of a residential zoning district shall the sound pressure level of any individual operation or plant, or the combined operation of any person, firm or corporation, exceed the decibel levels in the designated octave bands set forth as follows:

OCTAVE BAND CENTER
FREQUENCY HERTZ
MAXIMUM SOUND PRESSURE
LEVELS (dB) ALONG DISTRICT
BOUNDARY
31.5
72
63
71
125
66
250
60
500
54
1000
49
2000
40
4000
44
8000
37
A scale levels (for monitoring purposes)
58
   (b)    Maximum sound pressure levels established in this section to be applied to the boundaries of a lot shall not apply to construction sites.
(Ord. 8176-75. Passed 2-24-75.)
   (c)    Whoever violates this section is guilty of a minor misdemeanor.