Wash. Admin. Code § 173-58-040 - Ambient conditions
The following ambient conditions shall be observed during measurements and shall determine whether testing is to occur or not:
(1) Wind. Sound level measurements shall not
be made when the wind speed is in excess of:
(a) 20 mph (32 km/hr) for the close proximity
test, WAC
173-58-080;
(b) 12 mph (19 km/hr) for all other
tests.
(2)
Precipitation. Sound level measurements shall not be made when precipitation is
falling in such a way as to affect the equipment or the measurement
readings.
(3) Background sound
level. Sound level measurements shall not be made when the difference between
the background sound level and the level of the measured sound source is less
than 10 dBA, unless, the measurement personnel are technically qualified to
logarithmically subtract the background level from the measured source's sound
level.
Notes
Statutory Authority: Chapter 70.107 RCW. 79-04-033 (Order DE 78-19), § 173-58-040, filed 3/22/79.
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