1. Intent. This district provides for a wide range of commercial and industrial uses, all of which shall be able to meet comparatively rigid specifications as to nuisance-free performance. The district specifically excludes residences on the theory that the mixture of residential use, and the public service and facilities for residences with those for industry is contrary to the purposes of these regulations irrespective of whether the industry is encroaching on a living area or a living area is encroaching on an industrial area.
2. Permitted Uses. The following uses are permitted in the ML District:
A. Any use allowed in the CGB District, except that all dwellings and other types of living accommodations shall be prohibited save that one quarters for a guard or caretaker shall be permitted as an accessory use for any permitted use occupying more than 20,000 square feet of lot area.
B. Any business, commercial, or industrial use which can meet the performance standards set forth for this district but not specifically excluded or specifically mentioned as belonging in another less restrictive district.
C. Agriculture, including the raising of field crops, horticulture, and animal husbandry. Feed lots, poultry farms, fur farms, and kennels shall be allowed when such activities shall meet the performance standards set forth for this district.
3. Excluded Uses. The following uses are prohibited within the ML District:
A. Dwellings, except caretaker and guard quarters as set forth herein.
B. Public, parochial, and private schools and colleges, except trade schools.
C. Hospitals, clinics, rest homes, and other institutions for housing or care of human beings.
D. Motels, hotels, and mobile home parks.
E. Any use not enumerated as permitted in this district but which is specifically provided for in another district or districts.
4. Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the ML District:
A. Any accessory use normally appurtenant to a permitted use shall be allowed provided such use shall conform with all performance standards set forth for this district.
5. Special Exceptions. Certain uses may be permitted in the ML District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses.
A. Recreation uses which are temporary in nature and do not involve any appreciable amount of fixed construction and which will not interfere with the efficient functioning of the district for its primary purpose of providing for manufacturing and heavy commercial establishments, may be allowed only upon appeal to the Board of Adjustment.
6. Performance Standards. The following performance standards shall apply in the ML District:
A. Physical Appearance. All operations shall be carried on within an enclosed building except that new materials or equipment in operable condition may be stored in the open. Normal daily wastes of an inorganic nature may be stored in containers not in a building when such containers are not readily visible from the street. The provisions of this paragraph shall not be construed to prohibit the display of merchandise or vehicles for sale or the storage of vehicles, boats, farm machinery, trailers, mobile homes, or similar equipment when in operable condition.
B. Fire Hazard. No operation shall involve the use of highly flammable gases, acid, liquors, grinding processes, or other inherent fire hazards. This provision shall not be construed to prohibit the use of normal heating fuels and welding gases when handled in accordance with other ordinances of the City.
C. Noise. No operation shall be carried on which involves noise in excess of the normal traffic noise of the adjacent street at the time of the daily peak hour of traffic volume. Noise shall be measured at the property line. When the level of such noise cannot be determined by observation with the natural senses, a suitable instrument may be used and measurement may include breakdown into a reasonable number of frequency ranges. All noises shall be muffled so as to not be objectionable due to intermittence, beat, frequency, or shrillness.
D. Sewage and Liquid Wastes. No operation shall be carried on which involves the discharge into a sewer, water course or the ground of liquid wastes of any radioactive nature, or liquid wastes of a chemical nature which are detrimental to normal sewage plant operation or corrosive and damaging to sewer pipes and installations.
(1) Air contaminants and smoke shall be less dark than designated Number One on the Ringleman Chart as published by the U.S. Bureau of Mines, except that smoke of a density designated as Number One shall be permitted for one four minute period in each one-half hour. Light-colored contaminants of such an opacity as to obscure an observer’s view to a degree equal to or greater than the aforesaid shall not be permitted.
(2) Particulate matter of dust as measured at the point of emission by any generally accepted method shall not be emitted in excess of two-tenths grains per cubic foot as corrected to a temperature of 500 degrees Fahrenheit, except for a period of four minutes in any one-half hour, at which time it may equal but not exceed six-tenths grains per cubic foot as corrected to a temperature of 500 degrees Fahrenheit.
(3) Due to the fact that the possibilities of air contaminants cannot reasonably be comprehensively covered in this section, there shall be applied the general rule that there shall not be discharged from any sources whatsoever such quantities of air contaminants or other material in such quality as to cause injury, detriment, nuisance, or annoyance to any considerable number of persons or to the public in general or to endanger the comfort, repose, health, or safety of any such considerable number of persons or to the public in general or to cause or have a natural tendency to cause injury or damage to business, vegetation, or property.
F. Odor. The emissions of odors that are generally agreed to be obnoxious to any considerable number of persons shall be deemed that strong odors of putrefaction and fermentation tend to be obnoxious and that such odors as associated with baking or the roasting of nuts and coffee shall not normally be considered obnoxious within the meaning of this chapter.
G. Gases. The gases sulfur dioxide and hydrogen sulfide shall not exceed five parts per million; carbon monoxide shall not exceed five parts per million. All measurements shall be taken at the zoning lot line.
H. Vibration. All machines, including punch presses and stamping machines, shall be so mounted as to minimize vibration and in no case shall such vibration exceed a displacement of three thousandths of an inch measured at the zoning lot line. The use of steam or broad hammers shall not be permitted in this district.
I. Glare and Heat. All glare, such as welding arcs and open furnaces, shall be shielded so that they shall not be visible from the zoning lot line. No heat from furnaces or processing equipment shall be sensed at the zoning lot line to the extent of raising the temperature of air or materials more than five degrees Fahrenheit.
7. Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the ML District:
8. Miscellaneous Provisions.
A. Off-street parking and loading shall be provided for all uses established in this district.