08-24-1960 Special Meeting - Laserfiche WebLink

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• I~ Frequency Displacement (Cycles Per Second) (Inches) 0 to 10 0. 0022 10 to 20 0. 0016 20 to 30 0. 0010 30 to 40 0. 0006 Over 40 0. 0005 III Displacement (Inches) 0. 0008 0. 0005 0. 0002 0. 0002 0. 0001 ~ Steady State -Vibrations: For the purpose of this Ordi- nance, vibrations which are continuous or, if in discrete pulses are more frequent than 60 per minute. Impact vibration, that is, discrete pulses which do not exceed 60 impulses per minute shall not cause in excess of twice the displacements stipulated. (c) Smoke and Particulate Matter: Smoke from any vent stack, chimney, skylight, window, building opening, or combustion process shall not exceed an opacity of Ringlemann No. 2 as observed on the Ringlemann Chart. However, once during any three-hours period, Ringlemann No. 3 opacity will be permitted but not in excess of five (5) minutes' duration. The emission of particulate matter from all sources shall not exceed 10 pounds per acre of property during any one hour. Dust coarser than 44 microns shall be limited to 0. 05 pound per acre of property during any one hour. (d) Toxic and Noxious Matter: The maximum permissible con- centratiort•of'toxic'and/br rioxious•matter shall be in accord- ance' with the "Maximum Permissible Concentration of Atmospheric Contaminants in Places'of Employment" as promulgated.by.the Texas State Department of Health, Division of Occupational Health, or the "Threshold Limit Values", adopted each year by the American Conference of Governmen- tal Industrial Hygienists, whichever is the most recent publi- cation. A ten (10) per cent concentration of the maximum permissible concentration shall be considered as the threshold limit for an industrial worker. In no case shall the concen- trations of toxic and/or noxious matter be released across source lot lines which will exceed fifty (50) per cent of the maximum permissible concentration, provided: ~'~ ~~