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MPCA State Rules - Chapter 7030: Noise Pollution Control , , http://www.pea_state_mn.us/rulesregs/rule7030.html Subp. 2. A-weighted. "A-weighted" means a specific weighting of the sound pressure level for the purpose of determining the human response to sound. The specific weighting characteristics and tolerances are those given in American National Standards Institute Sl.4-1983, section 5.1. Subp. 3. Daytime. "Daytime" means those hours from 7:00 a.m. to 10:00 p.m. Subp. 4. dB (A) . "dB (A) " means a unit of sound level expressed in decibels (dB) and A-weighted. Subp. 5. Decibel. "Decibel" means a unit of sound pressure level, abbreviated as dB. Subp. 6. Impulsive noise. "Impulsive noise" means either a single sound pressure peak (with either a rise time less than 200 milliseconds or total duration less than 200 milliseconds) or multiple sound pressure peaks (with either rise times less than 200 milliseconds or total duration less than 200 milliseconds) spaced at least by 200 millisecond pauses. Subp. 7. LI0. "LI0" means the sound level, expressed in dB (A) , which is exceeded ten percent of the time for a one hour survey, as measured by test procedures approved by the commissioner. Subp. 8. L50. "L50" means the sound level, expressed in dB (A), which is exceeded 50 percent of the time for a one hour survey, as measured by test procedures approved by the commissioner. Subp. 9. Municipality. "Municipality" means a county; a city; a town; a regional planning and development commission established under Minnesota Statutes, chapter 473; the metropolitan council; or other governmental subdivision of the state responsible by law for controlling or restricting land use within its jurisdiction. Subp. 10. Nighttime. "Nighttime" means those hours from 10:00 p.m. to 7:00 a.m. Subp. 11. Person. "Person" means any human being, any municipality or other governmental or political subdivision or other public department or agency, any public or private corporation, any partnership, firm, association, or other organization, any receiver, trustee, assignee, agency, legal entity, other than a court of law, or any legal representative of any of the foregoing, but does not include the agency. Subp. 12. Sound pressure level. "Sound pressure level", in decibels, means 20 times the logarithm to the base 10 of the ratio of the pressure to the reference pressure. The reference pressure shall be 20 micronewtons per square meter. STAT AUTH: MS s 116.07 subds 2,4 HIST: 11 SR 43; L 1987 c 186 s 15; 18 SR 614 7030.0030 NOISE CONTROL REQUIREMENT. No person may violate the standards established in part 7030.0040, unless exempted by Minnesota Statutes, section 116.07, subdivision 2a. Any municipality having authority to regulate land use shall take all reasonable measures within its jurisdiction to prevent the establishment of land use activities listed in noise area classification (NAC) 1, 2, or 3 in any location where the standards established in part 7030.0040 will be violated immediately upon establishment of the land use. STAT AUTH: MS s 116.07 subds 2,4 HIST: 11 SR 43; 18 SR 614 7030.0040 NOISE STANDARDS. Subpart 1. Scope. These standards describe the limiting levels of sound established on the basis of present knowledge for the preservation of public health and welfare. These standards are consistent with speech, sleep, annoyance, and hearing conservation requirements for receivers within areas 2of9 04/07/97 15:45:32