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11 <br />TABLE 9-1025.9: <br />NOISE AND LAND USE:COMPATIBILITYSTANDARDS <br />FOR INDUSTRIAL.AND COMMERCIAL NOISE SOURCES <br />CUMULATIVE DURATION OF <br />EXTERIOR NOISE LEVEL STANDARDS2 <br />NOISE EVENT' <br />(MINUTES) <br />DAYTIME 3,5 <br />NIGHTTIME 4.5 <br />30 <br />50 <br />45 <br />15 <br />55 <br />50 <br />5 <br />60 <br />55 <br />1 <br />65 <br />60 <br />0 <br />70 <br />65 <br />Cumulativeduration refers to time within :any one-hour period. <br />2 Noise level standards measured in dB's. <br />3 Daytime = Hours between 7:00 a.m. and::10:00 p.m. <br />4 Nighttime = Hours between.10:00 p. -.mi: and::7:00,'a.m <br />5 Each of the noise level standards: specified': may be reduced by 5 dB for tonal noise (i.e., a <br />signal which- has. a particular and. unusual;:pitch) : or for. noises consisting primarily of speech <br />or for recurring impulsive noises (i.e., sounds of short: duration, usually less than one <br />second, with an:abrupt onset and rapid: decay such as:.the discharge of firearms). <br />March 1993 1025-5 <br />