Ordinance No. 20249 - Laserfiche WebLink

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designated as high value wetlands in the wetland buffer provisions of this code, noise generated by uses within the NR zone and the wetland buffer overlay zone (as measured at the wetland boundary) and within the waterside protection overlay zone (as measured at the top of the high bank) shall not exceed the fbllowing standards: (a) Maximum sound emissions shall not exceed equivalent sound pressure levels in decibels, A-Weighted Scale, ibr any one hour as stipulated in subsection (b) of this section. Equivalent sound pressure level (Leq) is a measure of the sound level for any one hour. k is the energy average of all the various sounds emitted fi:om the source during the hour. A-Weighted Scale is used to adjust sound measurements to simulate the sensitivity of the human ear. {lb) Maximum one-hour equivalent sound pressure levels: A-Weighted (dBa) ~eceiv~ Propertz_Residential Broad Zone Catego~ Time of~ Level 7 am ~ 10 pm 57 10 pm - 7 am 50 (c) Noiseaof short duration. For noises of short duration or impulsive character, such as hammering, maximum one-hour sound pressure levels permitted beyond the property of origin shall be seven decibels less than those listed in subsection (b). (d) 'N0~i.ses of unusual pe_rriodic character. For noises of unusual periodic character, such as humming, screeching, and pure tones, the tbllowing median octave band sound pressure levels, as required by the Department of Environmental Quality, shall not be exceeded beyond the property of origin when the receiving property is in the NR zone: Median Octave Band Sound Pressure i[,evels Octave BaCd Center Frequen_qcy, Hz 7amq0pm l_~m-7am 31.5 68 65 63 65 62 125 61 56 250 55 50 500 52 46 1.000 49 43 2,000 46 40 4,000 43 37 8,000 40 34 Ordinance - 5