§ 119.10. Definitions.  


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  • The following terms shall have the following definitions for the purpose of this chapter:

    Additions. Any extension or expansion of an existing building footprint, including any increase of year-round habitable indoor space, occupancy or use.

    Annual contour map. The map of noise contours depicting city blocks with homes that are within or touched by the DNL 60-64 contours based on noise contours developed annually pursuant to section 8.1(d) of the original consent decree and pursuant to the first amendment to consent decree or pursuant to any other legally binding document designed or intended to supplement or add to the noise mitigation required under the original consent decree.

    Appurtenance. The visible, functional, or ornamental objects accessory to and part of a building not normally occupied by people including garages and accessory buildings; and other unconditioned spaces including screen porches, gazebos, decks.

    Central air conditioning. An air conditioning system which uses ducts to distribute cooled and/or dehumidified air to more than one (1) room, or uses pipes to distribute chilled water to heat exchangers in more than one (1) room, and which is not plugged into a standard electrical outlet. With a typical split system, the compressor and condenser are located in an outdoor unit; the evaporator is mounted in the air handling unit (which is often a forced air furnace). With a package system, all components are located in a single outdoor unit that may be located on the ground or roof.

    Consent decree. The consent decree signed on October 19, 2007, by Judge Stephen C. Aldrich of the Minnesota District Court, 4th Judicial District in that action entitled City of Minneapolis et al v. Metropolitan Airports Commission et al. , the first amendment to consent decree, and any amendments thereto or any subsequent consent decree or other document designed or intended to supplement or add to the noise mitigation provided under the original consent decree, unless the context clearly indicates a different meaning.

    dBA. 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.

    DNL. The day-night average level, or the twenty-four (24) hour equivalent continuous sound level (time averaged A-weighted sound level) from midnight to midnight, obtained after the addition of ten (10) dBA to sound levels measured from 10:00 p.m. to 7:00 a.m.

    First amendment to consent decree. The document that was entered into by the parties to the original Consent Decree in May 2013 and signed on September 25, 2013, by Judge Ivy S. Bernhardson of the Minnesota District Court, 4th Judicial District in that action entitled City of Minneapolis et al v. Metropolitan Airports Commission et al. which provides for additional noise mitigation based on the annual contour map.

    Infill development. A vacant parcel or parcels of land proposed for development of uses similar to or less noise sensitive than the surrounding developed parcels including, but not limited to a new house on a vacant lot in a residential neighborhood.

    Major development. A parcel of land greater than two and one-half (2.5) acres with existing structures which are proposed to be extensively rehabilitated or demolished for different uses. For example, demolition of an entire block of old residential, office and hotel buildings for new housing, office, commercial uses or conversion of warehouse to office and commercial uses.

    Mechanical ventilation. Controlled, purposeful introduction of outdoor air to the conditioned space. The primary purpose of a whole-house mechanical ventilation system in a home is to provide, throughout the habitable and conditioned space, a controlled amount of unpolluted outside air for indoor pollutant dilution and removal, for the sensory satisfaction of occupants and to control interior moisture and indoor air quality.

    New development. A vacant parcel or parcels of land in excess of one (1) acre or requested to be rezoned for development. For example, a residential subdivision, industrial park or shopping center.

    Noise attenuation. The reduction in sound level which occurs between the source and receiver by means of construction methods and materials.

    Reconstruction of existing structures. Replacing an existing building to accommodate the same use that existed before destruction or reconstruction, including indoor occupancy and use.

    Sound transmission class (STC). A single number rating for describing the degree of sound transmission loss specified for a wall, window, partition or other building element based on laboratory testing. The higher the STC, the more attenuation the building element will afford. Sound transmission loss performance shall be tested per American Society of Testing Materials (ASTM) E90 and STC rating method per ASTM E413. The same data shall be used to determine the A- weighted Noise Level Reduction (ANLR). The testing laboratory shall be certified by the National Institute of Science and Technology's, "National Voluntary Laboratory Accreditation Program" (NVLAP). (Ord. No. 2016-071 , § 1, 10-7-16)