Laserfiche WebLink
<br />. <br /> <br />e <br /> <br />e <br /> <br />. <br /> <br />7030.0060 MEASUREMENT METHODOLOGY. <br />Subpart I. Measurement location. Measurement of sound must be made at or within the <br />applicable NAC at the point of human activity which is nearest to the noise source. All <br />measurements shall be made outdoors, <br />Subp. 2. Equipment specifications. All sound level measuring devices must meet Type <br />0, I, II, or S specifications under American National Standards Institute SI.4-I983, <br />Subp.3. Calibration. All sound level measuring devices must, at a minimum, be <br />externally field calibrated before and after monitoring using a calibration device of known <br />frequency and sound pressure level. <br />Subp. 4. Measurement procedures, The following procedures must be used to obtain <br />representative sound level measurements: <br />A. Measurements must be made at least three feet off the ground or surface and away <br />from natural or artificial structures which would prevent an accurate measurement. <br />B. Measurements must be made using the A-weighting and fast response characteristics <br />of the sound measuring device as specified in American National Standards Institute <br />SIA-1983. <br />C. Measurements must not be made in sustained winds or in precipitation which results <br />in a difference ofIes> than ten decibels between the background noise level and the noise <br />source being measured. <br />D. Measurements must be made using a microphone which is protected from ambient <br />conditions which would prevent an accurate measurement. <br />Subp. 5. Data documentation. A summary sheet for all sound level measurements shall <br />be completed and signed by the person making the measurements. At a minimum, the <br />summary sheet shaH include: <br /> <br />A. date; <br />B. time; <br />C. location; <br />D. noise source; <br />E. wind speed and direction; <br />F. temperature; <br />G. humidity; <br />H. make, model, and serial number of measuring equipment; <br />L field calibration results; <br />J. monitored levels; and <br />K. site sketch indicating noise source, measurement location, directions, distances, and <br />obstructions. <br /> <br />Statutory Authority: MS s 116.07 subds 2,4 <br />History: 11 SR43; 17 SR 1279; 18 SR6I4 <br /> <br />7030.0070 SOUND ATTENUATION MEASUREMENT METHODOLOGY. <br />Subpart I. Purpose. Sound level measurements made for assessing sound attenuation <br />as specified in part 7030.0050, subpart 3, item B, C, or D, shall be made according to the <br />requirements of this part. <br />Subp. 2. Equipment. The equipment shall meet the requirements specified in part <br />7030.0060, subpart 2. <br />Subp. 3. Calibration. The equipment must meet the calibration requirements specified in <br />part 7030.0060, subpart 3. <br />Subp, 4. Measurement procedure. The measurement procedure described in <br /> <br />24 <br />