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CHAPTER 63 - LOT DEVELOPMENT STANDARDS

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63.650 NOISE

Noise level readings shall be taken at the point of measurement.  Noise shall be muffled so as not to become objectionable due to intermittence, beat frequency, shrillness or intensity.  The sound pressure level of noise in an octave band frequency radiated continuously from a facility shall not exceed the following values:



    PERMITTED NOISE LEVELS

Duration of Sound	7 a.m. - 6 p.m. (all districts)	6 p.m - 10 p.m. (residential districts) or 6 p.m. - 7 a.m. (all other districts)	10 p.m. - 7 a.m. (residential districts)
Less than 10 minutes	75 db	70 db	60 db
Between 10 minutes and 2 hours	70 db	60 db	50 db
In excess of 2 hours	60 db	50 db	40 db

Values in this table are subject to the correction factors listed in Paragraph 63.651.  Sounds in excess of the residential district limitations as measured in a residential district violate this section whether the sound originates in a residential district or any other district.

63.651

If the noise is not smooth and continuous, one or more of the corrections which follow shall be added or subtracted from the applicable decibel level given in the preceding paragraph.  

Type of Operation of Character of Noise	Correction in Decibels
Noise source operates less than 20% of any one hour period	Plus 5*
Noise source operates less than 5% of any one hour period	Plus 10*
Noise source operates less than 1%  of any one hour period	Plus 15*
Noise of impulsive character (hammering, etc.)	Minus 5
Noise of periodic character (hum, screech, etc.)	Minus 5
* Apply one of these corrections only.

63.652

Exceptions to Noise Level Standards:  Sounds emerging from the operation of (1) motor vehicles on a public highway; (2) aircraft; (3) outdoor implements such as power lawn mowers, snowblowers, power hedge clippers and power saws; (4) emergency equipment of any kind; (5) maintenance equipment operated by a public agency or utility; and (6) pile drivers or jackhammers and other construction equipment, are exempt from the provisions of this section.  Sounds emanating from lawful and property activities at schoolgrounds, playgrounds, parks or places wherein athletic contests take place are exempt from the provisions of this ordinance.  

In addition, in locations where the ambient noise level generated by daily traffic on an adjacent street or by commercial aircraft exceeds the standards set forth in Paragraph 63.650, control of noise shall not be required to produce a sound level below that of the ambient noise level.  



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