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.. • <br />measurement is located on a property line which <br />is also the boundary line of a Residential or <br />Commefi'cial District or within eighty (80) feet <br />of a Residential or Commercial District bound- <br />ary line which is located within a street right <br />of way, in which the limits set forth in Column <br />II below shall apply. <br />Octave Band <br />Frequency Maximum Sound Levels -Decibels <br />I II <br />Residential District <br />Cycles per Second Lot Line Boundary <br />20 to 75 81 75 <br />75 to 150 76 70. <br />150 to 300 68 b2 <br />300 to 600 61 55 <br />600 to 1200 55 49 <br />1200 to 2400 49 43 <br />2400 to 4800 43 37 <br />Above 4800 41 35 <br />Impact Noise 83 55 <br />' Between the hours of 10:00 PM and 6:00 AM, the <br />permissible sound levels beyond Residential <br />District boundaries (both Column II and Impact) <br />shall be six (b) decibels less than shown above. <br />.~ <br />(b) Vibration: At the poi of measurement, as described <br />in Subsection 13- -3, earthborne vibrations from <br />any operation or plant shall not exceed the limits set <br />forth in Column II below, unless the point of meas- <br />urement is located on a property line which is also <br />' the boundary line of a Residential or Commercial <br />District or within eighty (80) feet of a Residential <br />• or Commercial District boundary line which is <br />located within a street right of way, in which case <br />the limits set forth in Column II below shall apply. <br />~}~~ <br />