Metropolitan Sytems Information Statement 1989

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MODEL ORDINANCE FOR AIRCRAFT NOISE ATTENUATION An ordinance promoting the health, safety and general welfare of the citizens of , Minnesota, by amending the zoning ordinance and code and by adopting new sections, requiring compliance with noise reduction standards in building construction. Section 1 Statutory Authority This ordinance is adopted pursuant to Minn. Stat. Sec. 473.192 (Supp. 1987). "Metropolitan Area Aircraft Noise Attenuation Act." Seciton 2 Findings of Fact The City of finds that development within certain areas of the city is impacted by aircraft noise; that said noise is beyond the regulatory authority of the city to control; that certain uses of land are inappropriate in areas of high aircraft noise; that some structures do not adequately attenuate aircraft noise resulting in negative impacts on the health, safety and welfare of the residents or inhabitants of the structures; that, through proper construction methods, the means exist to attenuate aircraft noise to interior levels which alleviate such negative impacts; and that the requirements of this ordinance are necessary to promote and preserve the health, safety and welfare of the citizens of Section 3 Purpose The purpose of this ordinance is to require that new or redeveloped buildings within the City of be constructed with materials and in such a manner that aircraft noise is attenuated by the structure to an interior level which has no adverse impact on the health, safety and general welfare of the residents, all in accordance with the Metropolitan Council's Guidelines for Land Use Compatibility with Aircraft Noise. These guidelines are part of the aviation chapter of the Metropolitan Development Guide. Section 4 Definitions For purposes of this ordinance, the terms defined in this section have the meanings given them in this section. AIRCRAFT NOISE ZONE. Aircraft Noise Zone means any one of the four zones identified on the maps included under Section 7 and incorporated herein. dBA. dBA means a unit of sound pressure level weighted by use of the A metering characteristics and weighting as specified in the American National Standards Institute Specification for Sound Level Meters (ANSI S1.4-1983), which is hereby incorporated by reference. dBA is also referred to as an A - weighted decibel. Leq. Leq means the equivalent continuous sound level which over the period of one hour has the same A -weighted sound energy as the time varying sound. 26