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344 <br />Article 6: Development Standards <br />Section 6.4: Performance Standards <br />(2) Mitigation <br />(a) Where proposed land development does not meet the maximum <br />permitted nose levels because of the nature of or equipment used in the <br />operation, design features, such as the following, may be included as <br />part of the site plan and may be utilized to insure that noise levels fall <br />within the range permitted by these performance standards: <br />(i) A 100 -foot landscaped buffer at the boundary of the Economic <br />Development District, may result in 3 -5 decibel reductions in <br />noise levels. <br />(ii) The use of existing topographic conditions or modifying the <br />topography to provide barriers to noise. <br />(iii) Locating noise - producing equipment and /or activities within a <br />building or elsewhere on the site. <br />(b) Design features used to mitigate noise factors must be clearly identified <br />on the site plan. <br />(c) Applicants must provide documentation of the source and level of noise, <br />and the specific manner in which the design feature will reduce the noise <br />to acceptable levels. <br />6.4.4 Vibration <br />(A) General Standards <br />(1) The instrument used to measure vibrations shall be a three component <br />measuring system capable of simultaneous measurement of vibration in three <br />mutually perpendicular directions. <br />(2) The maximum velocity shall be the sum of the three components. <br />(3) The vibration maximums set forth in Tables 6.4.4.13 & 6.4.4.0 are stated in terms <br />of particle velocity, which may be measured directly with suitable instrumentation <br />or computed on the basis of displacement frequency. When computed, the <br />following formula shall be used: <br />(4) The values stated in Tables 6.4.4.B & 6.4.4.0 may be multiplied by 2 for impact <br />vibrations. <br />87 Staff is suggesting that "schools" be added as a Receiving Land Use Type since a school now exists within the <br />boundary of one EDD and protecting the school from high noise levels from adjoining properties is desirable. <br />Orange County, North Carolina — Unified Development Ordinance <br />Page 6 -16 <br />