All uses in all districts shall conform in operation, location, and construction to the performance standards hereinafter specified.
(1995 Code, ch. 9, art. 19, intro; Ordinance 2024-03-00998 adopted 3/21/2024)
At no point at the bounding property line of any use in the "VC,""CB" or "LI" districts shall the sound pressure level of any daytime operation or plant exceed the decibel limits specified in the octave band groups designated in the following table:
(1)
Octave band frequencies.
Octave Band | Maximum Permitted Sound Pressure Level |
|---|---|
Cycles per Second | Decibels |
20-75 | 97 |
75-150 | 76 |
150-300 | 70 |
300-600 | 65 |
600-1,200 | 63 |
1,200-2,400 | 58 |
2,400-4,800 | 55 |
4,800-10,000 | 53 |
(2)
Corrections.
The following corrections shall be made to the table of octave band-decibel limits in determining compliance with the noise level standards:
Type of Operation or 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 |
Noise present at night | Minus 7 |
* | Apply one correction only |
(3)
"Daytime" shall refer to the hours between 7:00 a.m. and 7:00 p.m. on any given day.
(4)
"Bounding property line" shall be interpreted as being at the far side of any street, alley, stream, or other permanently dedicated open space from the noise source when such open space exists between the property line of the noise source and adjacent property. When no such open space exists, the common line between two parcels of property shall be interpreted as the bounding property line.
(5)
"Measurement of noise" shall be made with a sound level meter or octave band analyzer meeting the standards prescribed by the American Standards Association.
(6)
Exemptions.
The following uses and activities shall be exempt from the noise level regulations herein specified:
(A)
Noises not directly under control of the property user.
(B)
Noises emanating from construction and maintenance activities during daytime hours.
(C)
Noises of safety signals, warning devices, and emergency pressure relief valves.
(D)
Transient noise of moving sources such as automobiles, trucks, airplanes, and railroads.
(1995 Code, sec. 9-160; Ordinance 2024-03-00998 adopted 3/21/2024)
No operation or use in any district shall cause, create, or allow the emission for more than three (3) minutes in any one (1) hour of air contaminants, which at the emission point or within the bounds of the property are:
(1)
Non-point source emissions from operations and uses in any district shall not cause, create, or allow emissions of smoke or particulate matter in violation of requirements specified by the Texas Commission on Environmental Quality (TCEQ) for control of air pollution from visible emissions and particulate matter as provided in the Texas Administrative Code, title 30, part 1, chapter 111.
(2)
The open storage and open processing operations, including on-site transportation movements which are the source of wind- or air-borne dust or other particulate matter, or which involve dust or other particulate air contaminant generating equipment such as used in paint spraying, grain handling, sand or gravel processing or storage or sand blasting, shall be so conducted that dust and other particulate matter so generated is located in concentrations not exceeding fifty-four (54) grains per one thousand (1,000) cubic feet of air.
(1995 Code, sec. 9-161; Ordinance 2024-03-00998 adopted 3/21/2024)
(a)
No use shall be located or operated in any district which involves the emission of odorous matter from a source of operation where the odorous matter exceeds the threshold at the bounding property line or any point beyond the tract on which such use or operation is located.
(b)
The odor threshold as herein set forth shall be determined by observation by a person or persons. In any case, where uncertainty may arise or where the operator or owner of an odor-emitting use may disagree with the enforcing officer or where specific measurement of odor concentration is required, the method and procedures as specified by American Society for Testing Materials (ASTMD) 1391-57 entitled "Standard Method for Measurement of Odor in Atmospheres" shall be used and a copy of ASTMD 1391-57 is hereby incorporated by reference.
(1995 Code, sec. 9-162; Ordinance 2024-03-00998 adopted 3/21/2024)
(a)
No use involving the manufacture or storage of compounds or products which decompose by detonation shall be permitted in an "LI" district except that chlorates, nitrates, perchlorates, phosphors, and similar substances and compounds in small quantities for use by industry, school laboratories, druggists, or wholesalers may be permitted when approved by the fire department.
(b)
The storage and use of all flammable liquids and materials such as pyroxylin plastics, nitrocellulose film, solvents, and petroleum products shall be permitted only when such storage or use conforms to the standards and regulations of the city.
(1995 Code, sec. 9-163; Ordinance 2024-03-00998 adopted 3/21/2024)
No operation or use permitted in an "LI" district shall emit a concentration across the bounding property line of the tract on which such operation or use is located of toxic or noxious matter which will exceed ten percent (10%) of the concentration (exposure) considered as the threshold limit for an industrial worker as such standards are set forth by the department of state health services in "Threshold Limit Values Occupational Health Regulations No. 3," a copy of which is hereby incorporated by reference and is on file in the office of the building official of the city.
(1995 Code, sec. 9-164; Ordinance 2024-03-00998 adopted 3/21/2024)
No operation or use in an "LI" district shall at any time create earthborne vibration which, when measured at the bounding property line of the source of operation, exceeds the limits of displacement set forth in the following table in the frequency ranges specified:
Frequency Cycles per Second | Displacement (Inches) |
|---|---|
0 to 10 | .0010 |
10 to 20 | .0008 |
20 to 30 | .0005 |
30 to 40 | .0004 |
40 and over | .0003 |
(1995 Code, sec. 9-165; Ordinance 2024-03-00998 adopted 3/21/2024)
No use or operation in any district shall be located or concentrated so as to produce intense glare or direct illumination across the bounding property line for a visible source of illumination nor shall any such light be of such intensity as to create a nuisance or detract from the use and enjoyment of adjacent property.
(1995 Code, sec. 9-166; Ordinance 2024-03-00998 adopted 3/21/2024)
No use or operation shall discharge into the open, onto the ground, or into any drainageway, open pit, or pond any waste materials, liquids, residue, or byproducts for storage, decomposition, disposal, or fill unless approved by the building official.
(1995 Code, sec. 9-167; Ordinance 2024-03-00998 adopted 3/21/2024)