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<br />MPCA State Rules - Chapter 7030: Noise Pollution Control <br /> <br />http://www.pea_state.mn.us/rulesregs/rule7030.html <br /> <br />O. The standards for a building in a noise area <br />classification 3 shall be applied to a building in a noise area <br />classification 2 if the following conditions are met: <br />(1) the building is constructed in such a way <br />that the exterior to interior sound level attenuation is at <br />least 30 dB (A) ; <br />(2) the building has year-round climate control; <br /> <br />and <br /> <br />(3) the building has no areas or accommodations <br />that are intended for outdoor activities. <br />STAT AUTH: MS s 116.07 subds 2,4 <br />HIST: 11 SR 43; 18 SR 614 <br /> <br />7030.0060 MEASUREMENT METHODOLOGY. <br />Subpart 1. Measurement location. Measurement of sound <br />must be made at or within the applicable NAC at the point of <br />human activity which is nearest to the noise source. All <br />measurements shall be made outdoors. <br />Subp. 2. Equipment specifications. All sound level <br />measuring devices must meet Type 0, I, II, or S specifications <br />under American National Standards Institute Sl.4-1983. <br />Subp. 3. Calibration. All sound level measuring devices <br />must, at a minimum, be externally field calibrated before and <br />after monitoring using a calibration device of known frequency <br />and sound pressure level. <br />Subp. 4. Measurement procedures. The following procedures <br />must be used to obtain representative sound level measurements: <br />A. Measurements must be made at least three feet off <br />the ground or surface and away from natural or artificial <br />structures which would prevent an accurate measurement. <br />B. Measurements must be made using the A-weighting <br />and fast response characteristics of the sound measuring device <br />as specified in American National Standards Institute Sl.4-1983. <br />C. Measurements must not be made in sustained winds <br />or in precipitation which results in a difference of less than <br />ten decibels between the background noise level and the noise <br />source being measured. <br />D. Measurements must be made using a microphone which <br />is protected from ambient conditions which would prevent an <br />accurate measurement. <br />Subp_ 5. Data documentation. A summary sheet for all <br />sound level measurements shall be completed and signed by the <br />person making the measurements. At a minimum, the summary sheet <br />shall include: <br />A. da t e ; <br />B. time; <br />C. location; <br />O. noise source; <br />E. wind speed and direction; <br />F. temperature; <br />G. humidity; <br />H. make, model, and serial number of measuring <br />equipment; <br />I. field calibration results; <br />J. monitored levels; and <br />K. site sketch indicating noise source, measurement <br />location, directions, distances, and obstructions. <br />STAT AUTH: MS s 116.07 subds 2,4 <br />HIST: 11 SR 43; 17 SR 1279; 18 SR 614 <br /> <br />7030.0070 SOUND ATTENUATION MEASUREMENT METHODOLOGY. <br />Subpart 1. Purpose. Sound level measurements made for <br />assessing sound attenuation as specified in part 7030.0050, <br />subpart 3, item B, C, or 0, shall be made according to the <br />requirements of this part. <br /> <br />6of9 <br /> <br />04/07/97 15:45:34 <br />