Noise impact limits

No manufacturing or business enterprise shall emit noise which, at the nearest Residence District boundary, is objectionable due to beat frequency, shrillness or intermittence. Measurement of noise shall be made at said Residence District boundary line by use of an octave band analyzer calibrated in the preferred frequencies (American Standards Association s1 6-190, Preferred Frequencies for Acoustical Measurement).

• A. The maximum permissible sound levels measured between 7:00 a.m. and 7:00 p.m. by this method shall be as follows:

  Octave Band Center Frequency Cycles Per Second	Maximum Permitted Sound Pressure in Decibels
  31.5	68
  63	67
  125	66
  250	59
  500	52
  1,000	46
  2,000	37
  4,000	26
  8,000	17

• B. Between the hours of 7:00 p.m. and 7:00 a.m., these values shall each be reduced by five decibels.