Section 11-46-9 - Measurement of sound levels(a) The director may adopt procedures which set forth criteria for the measurement of sound. Such procedures may be in substantial conformity with standards and recommended practices established by the American National Standards Institute or the Society of Automotive Engineers, and the latest revisions thereof.(b) The director may revise such measurement procedures from time to time to reflect current engineering judgment and advances in noise measurement techniques.(c) For the purpose of this chapter, sound level measurements shall be conducted using standard. procedures, with sound level meters, using the "A" weighting network and "slow" meter response unless otherwise stated.(d) Sound level meters and calibrators shall conform to specifications provided in the American National Standard, ANSI SI.4-1983, specification for sound level meters.(e) Windscreens shall be used whenever appropriate.(f) The various factors affecting the accuracy of a measurement shall be evaluated to the extent necessary for the implementation of this chapter. For example, if the accuracy with which a measurement can be made with specific instruments at a specific location is plus or minus two dBA, then any measured level greater than the specified maximum permissible sound level, plus two dBA, will indicate that excessive noise has been emitted.(g) Measurements shall normally not be used for enforcement unless the noise level at a point of measurement is more than three decibels greater than the ambient or background noise level.(h) The ambient noise level may be estimated from sound levels measured during nonoperation of the noise source or by sound levels measured at one or more points near the point of measurement where the noise source is inaudible.[Eff SEP 23 1996] (Auth: HRS §§ 342F-3, 342F-31) (Imp: HRS §§ 342F-3, 342F-31)