Ordinances-1983-111

equivalent opacity of smoke, the Ringelmann Chart as published by the United States Bureau of Mines shall be used. The emission of smoke darker in shade than Ringelmann No. 1 from any chimney, stack, vent, opening, or combustion process beyond lot lines is prohibited. (b) Particulate Matter. No person shall operate or cause to be operated any process or furnace or combustion device for the burning of coal or other natural or synthetic fuels without using approving equipment, methods or devices to reduce the quantity of gas born or air born solids of fumes emitted into the opening air exceeding a rate permitted below at the temperature of 500° Fahrenheit. For the purpose of determining the adequacy of such devices, these conditions shall apply when the percentage of excess air in the stack does not exceed 50% at full load. The foregoing requirement shall be measured by the A.F.M.E. Test Code for dust-separating apparatus. All other forms of dust, direct and flyash shall be completely eliminated insofar as escape or emission into the open air is concerned. The emission of particulate matter suspended in air shall not exceed 0.35 grains (.0023 ounces) per standard cubic feet (70° F and 14.7 psia) of air during any one-hour period or a total from all vents and stacks of one-half (\( \frac{1}{2} \)) pound per hour per acre of lot area during any one-hour period. (c) Toxic Matter. The release of airborn toxic matter from any operation or activity shall not exceed the fractional quantities permitted below the threshold Limit Values adopted by the American Conference of Governmental Industrial Hygienists. If a toxic substance is not listed, verification that the proposed level of toxic matter will be safe and not detrimental to the public health or injurious to plant and animal life will be required. The measurement of toxic matter shall be on the average of any 24-hour sampling period. The release of airborn toxic matter shall not exceed one-eighth of the Threshold Limit Values beyond lot lines. (d) Odor. The emission of offensive odorous matter from any operation or activity shall not exceed the odor threshold concentration defined in the American Society for Testing and Materials Method D1391-57 "Standard Method for Measurement of Odor in Atmospheres (Dilution Method)" as the level which will just evoke a response in the human olfactory system when measured as set forth below. Odorous matter shall not exceed the odor threshold concentration beyond lot lines at ground level or habitable elevation.