WAC 173-60-040
Maximum permissible environmental noise
levels. (1) No person shall cause or permit noise to intrude
into the property of another person which noise exceeds the
maximum permissible noise levels set forth below in this
section.
(2)(a) The noise limitations established are as set forth
in the following table after any applicable adjustments
provided for herein are applied.
EDNA OF
NOISE SOURCE
EDNA OF
RECEIVING PROPERTY
Class A
Class B
Class C
CLASS A
55 dBA
57 dBA
60 dBA
CLASS B
57
60
65
CLASS C
60
65
70
(b) Between the hours of 10:00 p.m. and 7:00 a.m. the
noise limitations of the foregoing table shall be reduced by
10 dBA for receiving property within Class A EDNAs.
(c) At any hour of the day or night the applicable noise
limitations in (a) and (b) above may be exceeded for any
receiving property by no more than:
(i) 5 dBA for a total of 15 minutes in any one-hour
period; or
(ii) 10 dBA for a total of 5 minutes in any one-hour
period; or
(iii) 15 dBA for a total of 1.5 minutes in any one-hour
period.