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k) <br /> <br />Performance Standards <br /> <br />Uses which because of the nature of their operation <br />are accompanied by an excess of noise, vibration, dust <br />dirt, smoke, odor, noxious gases, glare or wastes <br />shall not be permitted. These .residual features shall <br />be deemed to be excessive when they exceed or deviate <br />from the performance standards set forth in the follow- <br />ing specifications: <br />% ) Noise <br /> <br /> Noise shall be muffled so as not to become objection- <br /> able due to intermittence, beat frequency, shrill- <br /> ness or intensity. At the property line, the sound <br /> pressure level shall be measured with a sound level <br /> meter and on an associated octave band analyzer, <br /> both of which are m~nufactured according to current <br /> specifications prescribed by-the American Standards <br /> Association. Measurement shall be made using the <br /> flat network of the sound level meter. <br /> <br /> Table I. <br /> <br />Octave Band Frequency Decibel Level <br />(Cycles per second) <br /> <br /> 20- 75 65 <br /> '75- 150 6O <br /> 150- 300 55 <br /> 300- 600 46 <br /> 600- 1. 200 40 <br /> 1. 200- 2.400 34 <br /> 2. 400 4. 800 31 <br /> over 4. 800 <br /> <br />Pa~e 16 <br /> <br /> <br />