ORD-2001-010 Establishment of EDD Subdistricts and Development Regulations

Browse Search

2.4 ENVIRONMENTAL FACTORS 35 Noise Levels: 1. Design features used to mitigate noise factors must be clearly identified on the comprehensive site development plan and documentation provided concerning the source and level of feature s noise, and the specific manner in which the desi n 9 will reduce the noise to acce table levels. 2. Where rooftop mechanical equipment is installed, equipment e uatel enclosures and /or the building design must adequately y provide for the reduction of noise so as to comply with the maximum permitted sound levels. P4. Loading areas may only face side or rear property lines and must be designed traffic movement within the site. so as not to interfere with Loading areas shall not be located within required drives or parking areas. MAXIMUM PERMITTED SOUND LEVELS Noise Level Limits [dB(A)] For Gene ratin Land Use Category Reseivit Land use Category 7:00 p.m. to 7:00 a.m. Residential develo ment of all types 7:00 a.m. to 7:00 .m. 45 50 Commercial, including office, service, and retail establishments 55 50 __. .. Light industrial, including distribution and warehousing facilities 65 60 Footnotes: 1) Impact noises orsounds that occur intermittent) ratherthan continuously Y uously are permissible up to a level of 10 dB(A) in excess of the figures listed in the table provided the source from which they are generated does not operate more than one minute in any one hour. This exception shall not apply from 7:00 P.M. to 7:00 a.m. when the adjacent lot is used or zoned for residential purposes. 2) Noise levels resulting from construction or other temporary activities which occur between the hours of 7:00 a.m. and 7:00 p.m. are exempt from the standards listed in the table. 1. Design features used to mitigate excessive vibration levels must be clearly identified on the »»= >< comprehensive. site development plan and documentation provided concerning the source and level ry vibration, and the specific manner in which the design features will reduce vibration to acceptable levels. MAXIMUM PERMITTED GOUND TRANSMITTED VIBRATION Maximum Particle Velocity for r >€ Receiving Land Use Category Generating Land Use Category Inches /Second Residential development of all types 0.02 Nonresidential development for all types 0.10 Footnotes: The vibration levels set forth in the table above are stated in terms of particle velocity whic h may be measured directly with suitable instrumentation or computed on the basis of displacement frequency. When computed, the following formula must be used: P.V. = Particle velocity (inches /second) P.V. = 6.28 x F x D where F = Vibration frequency (cycles/second) 4 Y c (Y ) D = Single amplitude displacement of the vibration inches The instrument used to measure vibrations must be a three component measuring asuring system capable of simultaneous measurement of vibration in three mutually perpendicular directions. The maximum velocity ill components recorded. be the sum of the three co Y 1) The values stated in the above table may be y multiplied by two (2) for impact vibrations, e.g., discrete vibration pulsations not exceeding one (1) second between P ulses. 2) Vibrations resulting rom construction or other r temporary activities which occur between the hours of 7:00 a.m. and 7:00 D.m. are exempt from the standard listed in the table. A:.. nn nu rvnu_u_n ; 1. Each permitted use, special use, and accessory use is required to comply with all applicable rules and standards concerning air pollution in accordance with NC State Law. 2. Each comprehensive site development plan must be accompanied by either: • A written determination from the staff of the appropriate State agency that an air quality permit is not required; or • If an air quality permit is required, a complete copy of the permit, including all conditions for reporting and monitorino_