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TABLE 9-1025.9: J <br /> NOISE AND LAND USE COMPATIBILITY STANDARDS <br /> FOR INDUSTRIAL AND COMMERCIAL NOISE SOURCES <br /> CUMULATIVE DURATION OF EXTERIOR NOISE LEVEL STANDAR.DS2 <br /> NOISE EVENT' <br /> (MINUTES) DAYTIME 3,5 NIGHTTIME4 s <br /> 30 50 45 <br /> 15 55 50 <br /> 5 60 55 <br /> 65 60 <br /> 0 70 65 <br /> Cumulative duration refers to time within any one-hour period. <br /> Z Noise level standards measured in dB's. <br /> 3 Daytime = Hours between 7:00 a.m. and 10:00 p.m. <br /> ° Nighttime = Hours between 10:00 <br /> 9 p.m. 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 />