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. .' . .5. Smoke. The Ringelman Smoke Chart, publisl~d by tl~ United States Bureau of Mines, shall De used for measuring smoke at tlie point of emission. Smoke not darker or more' opaque than No.4 on said chart may hE. emitted, excf'!'t that smoke darker or more opaque than No.2 on said chart may not be emitter.! for periods longer than four (4) minutes in Bny thirty (30) mInutes. These provisions, applicable to visible gray smoke, shall also apply to visible smoke of a different color but an equivalent apparent opaci ty. 6. Dust. SoHd or liquid particles shall not be emJ tted at any point in , concentrations exceeding 0.3 grains per cubil: foot of the conveying gas or air. For measuring the :mount of particles In gases resulting from combustion, standard c'orrections shall be applied to a stack temperature of five hundred degrees Fahrenheit (5000F) and fifty percent (50%) excess air. 7. Fumes or Gases. Fumes or gases shall nol be emitted at any point in concentrations or amounts that are noxious, lexie, or corrosive. The values given in Table 1 (IlldustriCll Hygiene Standards -- t-laximum Allowable Concentration for eight (8}-hour day, five (5) days per week), Table III (Odor Thresholds), Table ~V (Exposure to Sub~tances Causing Pain in tl~ Eyes), and Table I (Exposure to Substances Causing Injury to Vegetation) in the latest revision of Chapter 5, "Physlologica:i. Effects," that contains such lables, in the "Air Pollution Abatement Manual," by the Manufacturing Chemists' Assod ation, Inc., Washington, D.C., are rereby established as guides for the elimination of fumes or gases which may be required before the issuance of a building pc:rmlt. 8. Fire Hazards. Any ,activity involving thc: use or storage of flammable or explosive materials shall be protected by ade:qu8 te fire-fighting and fire prevention equ,ipment and by such safety devices as are normally used in the handling of such materials. Such hazards shall he kept removt;d from adjacent activities to a distance which is compatible with the potential danger involved. 9. Wastes. 1.11 soliel waste material. dehris or refuse shall be kept within a completely en~losed building or properly contained in a closed container designed for such purposes. All liquid wastes contai~ing any organic or toxic matter shall be Isol~ted, treated, and disposed of in a m~nner permitted by applicable law and regulation. The health officer shall assist in determining the proper method of waste treatment and dl sposa1. 10. Air Pollution. Every activity shall conform to state regulations relating to air quali ty standards and air po1lut ion control. 11. Erosion. No activity shall be carried on in such a way that water, soil or any obJectional,le substance is carried onto I1ny adjacent property. 12. Radioacti'1ity or Electrical Disturhance. No activity shall emit dangerous radioactivity or any electrical disturbance r.dversely affecting the operation of any equipment or human hahitation at any poir.t other than at the origin of such dlaturbance. 900.30 - Regulations on Screening, LandscapIng) Ligh~, Storage and Ou~ D1 splay,!, 1. Screening. All nonresidential principal and accessory uses, except business signs, which are situated within fifty (50) feet of a residential distric.t, shall 35.