Standards of performance

The following standards for the operation of manufacturing uses shall apply:

- A. Noise. Noise shall be measured from any property line of the tract on which the manufacturing operation is located. At the specified points of measurement, the sound pressure level of noise radiated continuously from a manufacturing facility or activity (other than background noises not under direct control of the manufacturing use, such as vehicular traffic) shall not exceed the values given in Tables 1 and 2 in octave bands of frequency, between the night-time hours of 11:00 p.m. and 7:00 a.m.

The instruments used for these measurements shall conform to the specifications published by the American Standards Association, Inc. New York, N. Y. The sound pressure level shall be measured with a Sound Level Meter (American Standard Specification for Sound Level Meters for measurement of Noise and Other Sounds, (S1.4-1961) and an Octave Band Filter Set, as indicated in Table 1).

Table 1 MAXIMUM PERMISSIBLE SOUND-PRESSURE LEVELS

Pre-1960 Octave Bands (a) Octave Band Frequency (Cycles per Second)	Decibels	Preferred Frequency Octave Bands (b) Octave Band Center Frequency (Cycles per Second)	Decibels
0—75	72	31.5	76
75—150	67	63	71
150—300	59	125	65
300—600	52	250	57
600-1,200	46	500	50
1,200—2,400	40	1,000	45
2,400—4,800	34	2,000	39
Above 4,800	32	4,000	34
		8,000	32

- - (a) Pre-1960 octave bands. A standardized series of octave bands prescribed by the American Standards Association in Z24.10-1953, Octave Band Filter Set for the Analysis of Noise and Other Sounds.
  - (b) Preferred frequency octave bands. A standardized series of octave bands prescribed by the American Standards Association in S1.6-1960, Preferred Frequencies for the Acoustical Measurements.

If the noise is not smooth and continuous and/or is not radiated between the hours of 11:00 p.m. and 7:00 a.m., one or more of the corrections in Table 2 following shall be added to or subtracted from each of the decibel levels given above in Table 1.

Table 2

Type of Operation or Character of Noise	Correction in Decibels
Daytime operation 7:00 a.m. to 11:00 p.m.	Plus 5

Noise source operated less than	Plus 5*
20 percent of any one-hour period

Noise source operated less than	Plus 10*
Five percent of any one-hour period

Noise source operated less than	Plus 15*
One percent of any one-hour period

Noise of impulsive character	Minus 5
(Hammering, and so forth)

Noise of periodic character	Minus 5
(Hum, screech and so forth)

* Apply one of these corrections only

- B. Vibration. Vibration shall be measured at the nearest property line. No vibration is permitted which is discernable to human sense of feeling for three (3) minutes or more duration in any one (1) hour of the day between the hours of 7:00 a.m. and 7:00 p.m., or thirty (30) seconds or more duration in any one hour between 7:00 p.m. and 7:00 a.m. No vibration at any time shall produce an acceleration of more than 0.1g or shall result in any combination of amplitudes and frequencies beyond the "safe" range of Table 7, U.S. Bureau of Mines Bulletin No. 442 "Seismic Effect of Quarry Blasting", on any structure. The methods and equations of said Bulletin No. 442 shall be used to compute all values for the enforcement of this regulation.
- C. Smoke and other forms of air pollution. Manufacturing operations shall conform to the air pollution control regulations of the Rhode Island Department of Environmental Management, issued under the provisions of Chapter 23-25 of the General Laws of Rhode Island, 1956, as amended, which regulations are hereby incorporated as part of this ordinance.
- D. Sewage and waste. Sewage and waste shall be deposited in the public sewage system when available. No sewage waste shall be discharged into the public sewage system, which adversely affects the efficient operation of the sewage treatment plant, or any part of the system, which is dangerous to the public health and safety. Effluent from any manufacturing use which is discharged into the ground shall at all times comply with the regulations of the Rhode Island Department of Environmental Management relating to the disposal of sanitary sewage in unsewered areas, issued under the provisions of Chapter 23-1 of the General Laws of Rhode Island, 1956, as amended, which regulations are hereby incorporated as part of this ordinance.
- E. Heat and glare. Any manufacturing operation producing heat and/or glare (as differentiated from interior illumination) shall be shielded so that no heat or glare can be recorded at the property line. No lighting shall be used in such a manner that produces glare on public highways or neighboring property.
- F. Radiation. Manufacturing operation shall cause no dangerous radiation at the property line as specified by the regulations of the United States Atomic Energy Commission.