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dBA - unit of sound level expressed in decibels (dB) and A-weighted (A). <br /> <br />shown <br /> <br />Commercial Areas - Those areas in the City within the following Zoning Districts as <br />on the City's official Zoning Map: <br />B-1 Business District; <br />B-2 Business District; <br />B-3 Highway Business District; and <br />B-W Business/Warehousing District. <br /> <br />Daytime - those hours from 7:00 a.m. to 10:00 p.m. <br /> <br />Decibel- a unit of sound pressure level, abbreviated as "dB". <br /> <br /> Dwelting Unit - a residential building or portion thereof intended for occupancy <br />including but not limited to single or multi-unit homes, apartrnents, hotels, motels, nursing <br />homes, seasonal cabins, boarding or rooming houses, tom-ist homes or trailers. <br /> <br /> impulsive Noise - either a single sound pressure peak (with either a r/se time less than <br />200 milliseconds or total duration less than 200 milliseconds) or multiple sound pressure peaks <br />(with either rise times less than 200 milliseconds or total duration less than 200 milliseconds) <br />spaced at least by 200 millisecond pauses. <br /> <br /> Industrial Areas - Those areas in the City within the following Zoning Districts as <br />shown on the City's official Zoning Map: <br /> I- 1 Industrial District; and <br /> RI Rm'al Industrial District. <br /> <br /> LI 0 - a sound level, expressed in decibels (dBA) which exceeded ten (10) percent of the <br />time for a one (1) hour time period, as measured by test procedures approved by the <br />commissi oner. <br /> <br /> L50 - a sound level, expressed in decibels (dBA) which exceeded fifty (50) percent of <br />the time for a one (1) hour time period, as measured by test procedures approved by the <br />commissioner. <br /> <br /> Motor Vehicle - every vehicle which is self-propelled and every 5,ehicte which is <br />propelled by electric power. The term motor vehicle includes, but is not limited to, automobiles, <br />motorcycles, snowmobiles, motor bikes, scooters, all terrain vehicles, and go carts. <br /> <br />Nighttime - those hours froTM 10:00 p.m. to 7:00 a.m. <br /> <br /> Off-highway Motorcycles (OHM) - are motorized, off-highway vehicles traveling on <br />two wheels. OHMs have a seat or saddle desi~ed to be straddled by the operator and have <br />handlebars for steering control. Motorcycles may be legal for highway use and still considered <br />to be OHMs if used for off-highway operation on trails or natural terrain. <br /> <br />-276- <br /> <br />2 <br /> <br /> <br />