36 BJRCH DRIVECiiATIIAi~4,ILLINOIS 62629(217) 483-3507(217) 483-5667-FAXE-mail: e~zak~justice.com P ~ February 5, 2003Iffinois Pollution ControlBoardJ.
R.
Thompson Center
Suite 11-500100 West Randolph StreetChicago, Illinois 60601RE: NOISE RULE UPDATE: AMENDMENTS TO 35 ILL.
This Standard describes how to
measurethe noise source ofinterest and correct forthe presence ofbackground sound.
Ifthe sound is steady, then a oneminute
period ofobservation is sufficient; ifthe sound is non-steady, thena longer period ofobservation may be required until the level measured does not vary by more than...
Allowed
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