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7030.0060 - Minnesota Administrative Rules ,� Page 1 of 1 <br /> Minnesota Administrative Rules Authenticate <br /> 7030.0060 MEASUREMENT METHODOLOGY. <br /> Subpart 1. Measurement location. Measurement of sound must be made at or <br /> within the applicable NAC at the point of human activity which is nearest to the noise <br /> source. All measurements shall be made outdoors. <br /> Subp.2. Equipment specifications. All sound level measuring devices must meet <br /> Type O, 1, 11, or S specifications under American National Standards Institute S1.4-1983. <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 /> fi-equency and sound pressure level. <br /> Subp.4. Measurement procedures. The following procedures must be used to <br /> obtain representative sound level measurements: <br /> A. Measurements must be made at least three feet off the ground or surface and <br /> away from natural or artificial structures which would prevent an accurate measurement. <br /> B. Measurements must be made using the A-weighting and fast response <br /> characteristics of the sound measuring device as specified in American National Standards <br /> Institute S1.4-1983. <br /> C. Measurements must not be made in sustained winds or in precipitation which <br /> results in a difference of less than ten decibels between the background noise level and the <br /> noise source being measured. <br /> D. Measurements must be made using a microphone which is protected from <br /> ambient conditions which would prevent an accurate measurement. <br /> Subp. 5. Data documentation. A summary sheet for all sound level measurements <br /> shall be completed and signed by the person making the measurements. At a minimum,the <br /> summary sheet shall include: <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 /> 1. field calibration results; <br /> J. monitored levels;and <br /> K. site sketch indicating noise source,measurement location,directions. <br /> distances,and obstructions. <br /> Statutory Authority: 111S s 116.07 <br /> History: 11 SR 43; 17 SR 1279, 18 SR 614 <br /> Published Electronically: December 12, 2003 <br /> v <br /> Copyright © 2003 by the Office of the Revisor of Statutes, State of Minnesota. All rights reserved. <br /> https://www.revisor.mn.gov/rules/?id=7030.0060 7/30/2014 <br />