No use otherwise allowed shall be permitted within any district which does not conform to the following standards of use, occupancy and operation, which standards are hereby established as the minimum requirements to be maintained within such area.
(1) Smoke. It shall be unlawful for any person, firm or corporation to permit the emission of any smoke from any source whatever to a density greater than that density described as No. 2 on the Ringlemann chart; provided that the following exceptions shall be permitted.
(a) Smoke, the shade or appearance of which is equal to but not darker than No. 3 on the Ringlemann chart for a period aggregating 4 minutes in any 30 minutes.
(b) Smoke, the shade or appearance of which is equal to but not darker than No. 3 of the Ringlemann chart for a period, aggregating 3 minutes in any 15 minutes, when building a new fire or when breakdown of equipment occurs such as to make it evident that the emission was not reasonably preventable.
Method of measurement. For the purposes of grading the density of smoke, the Ringlemann chart, as now published and used by the United States Bureau of Mines, which is hereby made a part of this chapter, shall be the standard. However, the umbrascope readings of smoke densities may be used when correlated with the Ringlemann chart.
(2) Dust, dirt and fly ash. No person, firm or corporation shall operate or cause to be operated, maintain or cause to be maintained, any process for any purpose, or furnace or combustion device for the burning of coal or other natural or synthetic fuels, without maintaining and operating while using such process or furnace or combustion device, recognized and approved equipment, means, method, device or contrivance to reduce the quantity of gasborne or airborne solids of fumes emitted into the open air, which is operated in conjunction with such process, furnace, or combustion device so that the quantity of gasborne or airborne solids shall not exceed 0.20 grains per cubic foot of the carrying medium at a temperature of 500 degrees Fahrenheit.
Method of measurement. For the purpose of determining the adequacy of such devices these conditions are to be conformed to when the percentage of excess air in the stack does not exceed 50% at full load. The foregoing requirement shall be measured by the ASME test code of dust separating apparatus. All other forms of dust, dirt and fly ash shall be completely eliminated insofar as escape or emission into the open air is concerned. The Building Official may require such additional data as is deemed necessary to show that adequate and approved provisions for the prevention and elimination of dust, dirt and fly ash have been made.
(3) Glare and radioactive materials. Glare from any process, such as or similar to arc welding, or acetylene torch cutting, which emits harmful ultraviolet rays shall be performed in such a manner as not to be seen from any point beyond the property line, and as not to create a public nuisance or hazard along lot lines. Radioactive materials and wastes, including electromagnetic radiation such as x-ray machine operation, shall not be emitted to exceed quantities established as safe by the U.S. Bureau of Standards, when measured at the property line.
(4) Fire and explosive hazards.
(a) In the I-1 Industrial District, the storage, utilization or manufacture of materials or products ranging from incombustible to moderate burning, as determined by the Fire Marshal, is permitted, subject to compliance with all other performance standards above mentioned.
(b) The storage, utilization or manufacture of materials, goods or products ranging from free to active burning to intense burning, as determined by the Fire Marshal, is permitted subject to compliance with all other yard requirements and performance standards previously mentioned, and provided that the following conditions are met.
1. The materials or products shall be stored, utilized or produced within completely enclosed buildings or structures having combustible exterior walls, which meet the requirements of the Building Code of the city.
2. All such buildings or structures shall be set back at least 40 feet from lot lines, or in lieu thereof all such buildings or structures shall be protected throughout by an automatic sprinkler system complying with installation standards prescribed by the National Fire Association.
3. The storage and handling of flammable liquids, liquified petroleum gases and explosives shall comply with the state rules and regulations as established by Public Act 207 of 1941, being M.C.L.A. §§ 29.1 et seq., as amended.
(5) Noise. The emission of measurable noises from the premises shall not exceed 60 decibels as measured at the boundary property lines, except where normal street traffic noises exceed 60 decibels during such periods, the measurable noise emanating from such premises may equal, but not exceed, such traffic noises. This provision shall apply in all districts except as specified in this section for the I Districts.
I-1 District. In all I-1 Districts, the measurable noise emanating from the premises used for activities permitted shall not exceed 75 decibels during the normal work periods of between the hours of 6:00 a.m. and 10:00 p.m. and shall not exceed 70 decibels during the sleeping hours of 10:00 p.m. to 6:00 a.m., as measured at the property lines. Noises shall be muffled so as not to become objectional due to intermittence, beat frequency or high frequency.
(6) Vibration. Machines or operations which cause vibration shall be permitted in industrial districts, but no operation shall cause a displacement exceeding 0.003 of 1 inch as measured at the property line.
(7) Odors. Creation of offensive odors shall be prohibited.
(8) Wastes. All discharges to the city's publicly owned sewage treatment facility (sanitary sewer system) shall conform to appropriate regulations in Chapter 78 relating to sewer services. Mobile home parks shall be governed by State Department of Health standards.
(1993 Code, § 82-472) (Ord. passed 10-12-1992)