Newtown City Zoning Code
§ B70-4.14
Performance standards.
No use permitted in an Industrial Zone shall be carried on in such a way as to violate any of the following performance standards. The charts and documents referred to below establishing the performance standards are on file with the Town Clerk of the Town of Newtown and constitute a part of these Regulations as set forth in full herein.
A.
Smoke, Dust or other Air Contaminant. Smoke, dust or other air contaminant shall not be discharged into the atmosphere for a period or periods aggregating more than three minutes in any hour, which is dark or darker in shade than that designated as No. 2 in the Ringelman Chart, as published by the United States Bureau of Mines, or which is of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke, designated as No. 2 on the Ringelman Chart.
B.
Noise. No sound pressure level shall exceed the decibel levels in the designated octave bands shown below. Sound levels shall be measured at the lot lines within which the subject use is located, and with a sound level meter and associated octave band filter manufactured in accordance with the American Standards Association. Measurements shall be made using the flat network of the sound level meter.
Maximum Permitted of Octave Bands of Cycles per Second | Maximum Permitted Sound Pressure in Decibels at Lot Line | |
|---|---|---|
31.5 | 72 | |
63 | 71 | |
125 | 65 | |
250 | 57 | |
500 | 51 | |
1,000 | 45 | |
2,000 | 39 | |
4,000 | 34 | |
8,000 | 32 |
C.
Odors. Offensive odors noticeable off the lot but within the Industrial Zone where the use is located shall not exceed the standards established as a guide by Table III (Odor Thresholds) in Chapter 5: "Air Pollution Abatement Manual," copyrighted 1951 by the Manufacturing Chemists Association, Inc., Washington, D.C.
D.
Vibration. Vibration noticeable off the lot but within the Industrial Zone shall not exceed the standards developed by the U.S. Bureau of Mines, Bulletin No. 442, or any revision thereof.