October 3, 2002IN THE MATTER OF: )) NOISE RULE UPDATE: ) R03-8AMENDMENTS TO 35 ILL.
The basis
for these changes is the American National Standards Institute updates from the years 19982001.
Reg.
27, p.
223, effective June 26, 1978; amended at 5 Ill.
As used in 35 Ill. Adm. Code 900
through 910 905, the following terms mean:A-Weighted Sound Level: dB(A), in decibels, a frequency weighted ten (10) times thelogarithm to the base 10 of the square of the ratio of the A-weighted (and time-averaged)sound pressure level, to the reference sound pressure of 20 micro...
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