§ 907.2. District standards

Any use constructed, established, altered, or enlarged in the I-L, Light Industrial District, after the effective date of this ordinance shall be so operated as to comply with the following standards:

A. No building shall be used for residential purposes except that a watchman may reside on the premises or as authorized by special exception use. (Ord. 1362)

B. No retail sales or services shall be permitted except as incidental to or accessory to a permitted use. Taverns are hereby expressly excluded in the I-L District.

C. No operation or activity shall cause or create noise in excess of the sound levels prescribed below.

In the I-L District, at no point on or beyond the boundary of any lot shall the sound pressure level resulting from any use, operation, or activity exceed the maximum permitted decibel levels for the designated octave bands as set forth in Tables I and II below:

TABLE I. PREFERRED FREQUENCIES

Center Frequency, Cycles Per Second	Maximum Permitted Sound Pressure Level Decibels
31.5	76
63	74
125	68
250	63
500	57
1,000	52
2,000	45
4,000	38
8,000	32

 

TABLE II. OCTAVE BANDS

Octave Bands, Cycles per Second	Maximum Permitted Sound Pressure Level Decibels
20—75	75
75—150	70
150—300	64
300—600	59
600—1,200	53
1,200—2,400	47
2,400—4,800	40
4,800—10 KC	34

 

Method of measurement: For the purpose of measure intensity and frequency of sound, the sound level meter, the octave band analyzer, and the impact noise analyzer shall be employed. The flat network and the fast meter response of the sound level meter shall be used. Sounds of short duration as from forge hammers, punch presses, and metal shears, which cannot be measured accurately with the sound level meter, shall be measured with the impact noise analyzer.

Octave band analyzers calibrated in the preferred frequencies (American Standards Association S1.6-1960, Preferred Frequencies for Acoustical Measurements) shall be used with the Table I. Octave band analyzers calibrated with pre-1960 octave band (American Standards Association Z24.10-1954, Octave band Filter Set) shall use Table II.

For impact sounds measured with the impact noise analyzer, the sound pressure levels set forth in Tables I and II may be increased by six (6) decibels in each octave band.

Exemptions: The following uses and activities shall be exempt from the noise level regulations:

1. Noises not directly under the control of the property user.

2. Noises emanating from construction and maintenance activities between 7:00 a.m. and 9:00 p.m.

3. The noises of safety signals, warning devices, and emergency pressure relief valves.

4. Transient noises of moving sources such as automobiles, trucks, airplanes and railroads.

D. No toxic matter, noxious matter, smoke, gas, or odorous or particulate matter shall be emitted that is detectable beyond the lot lines of the lot on which the use is located.

E. Earth carried vibration shall be limited so that detection by seismograph at any property line of an industrial establishment shall not exceed a value measured and computed as follows:

Method of measurement: measurement shall be made at the property line; vibration displacements shall be measured with an instrument capable of measuring in three mutually perpendicular directions.

Maximum permissible displacements: The following formula shall be used in computing the maximum displacements permitted in the I-L District:

D =

K F

 

Where:

D = displacement in inches

K = [0].01

F = the frequency of the vibration transmitted through the ground in cycles per second

F. Exterior lighting fixtures, wherever necessary, shall be shaded to avoid casting direct light upon property located in any residential district.

G. The manufacture of flammable materials which produce explosive vapors or gases is prohibited.

H. Outdoor storage material must be located in such a manner that it is neat, orderly, systematically stacked and not randomly placed upon the property. Similar type material must be stored together. Outdoor storage must not encourage the harboring of rats, mice, snakes, insects, mosquitoes, and/or other pests. The outdoor storage must also be free of any high grass and/or weeds.

I. Any operation that produces intense glare or heat shall be adequately shielded or be performed within a completely enclosed building, and exposed sources of light shall be screened so as not to be detectable beyond the lot lines.

J All vehicles must be parked on an all-weather surface.

K. Petroleum products must be located on an all-weather, City of Vernon Code Enforcement approved surface and free of all vegetation.

L. All dead trees and/or shrubs are prohibited and must be removed immediately.

(Ord. No. 1362; Ord. No. 1521, §§ 1.I—K, 9-22-2009)