1.   Intent. The Heavy Industry District is established as a district in which the principal use of land is for heavy commercial and industrial establishments, which may create some nuisance and which are not properly associated with or compatible with residential, institutional, and commercial-service establishments. The intent of this section is to:

      A.   Encourage the construction of and continued use of the land for heavy commercial and industrial purposes.

      B.   Prohibit residential use of the land and to prohibit any other use which would substantially interfere with the development, continuation or expansion of commercial and industrial uses in the district.

      C.   Encourage the discontinuance of existing uses that would not be permitted as new uses under the provisions of this section.

   2.   Principal Permitted Uses.

      A.   Uses permitted in the I-1 District, provided that no dwelling or dwelling unit is permitted except those for employees having duties in connection with any premises requiring them to live on said premises, including such families of such employees when living with them.

      B.   Any other use not otherwise prohibited by law; provided, however, the following uses shall be permitted subject to approval by the City Council after public hearing, and after report and recommendation by the Commission:

         (1)   Acid manufacture.

         (2)   Cement, lime, gypsum, or plaster of Paris manufacture.

         (3)   Distillation of bones, coal tar, petroleum, refuse, grain, or wood.

         (4)   Dump.

         (5)   Drilling for or removal of oil, gas or other hydrocarbon substance.

         (6)   Explosives manufacture or storage.

         (7)   Fat rendering.

         (8)   Fertilizer manufacture.

         (9)   Garbage: offal or dead animal or fish reduction or dumping.

         (10)   Gas manufacture.

         (11)   Glue manufacture.

         (12)   Grain elevators, grain drying or fee manufacture, provided that provisions are made for the recovery of the dust.

         (13)   Foundry casting, lightweight non-ferrous metals.

         (14)   Commercial swine and/or cattle feeding stations.

         (15)   Junk yard, including automobile and truck wrecking.

         (16)   Mineral extraction, including sand and gravel.

         (17)   Petroleum or petroleum products refining.

         (18)   Rubber goods manufacture.

         (19)   Smelting of ores.

         (20)   Stockyard or slaughter of animals, except poultry or rabbits.

         (21)   Tannery.

         (22)   Junk yard, provided all activities are conducted within a solid fenced enclosure.

         (23)   Mining, sand and gravel pits.

         (24)   Salvage yard, automobile, tractor or machinery wrecking and used parts yards, provided all activities are conducted in a closed building. The salvage yard shall be completely closed with a solid fence.

   3.   Accessory Uses.

      A.   Signs used and permitted under the C-1 classification.

      B.   Accessory uses incidental to a principal permitted use.

   4.   Required Conditions.

      A.   All principal or accessory structures housing a use permitted under the I-2 classification shall be located a minimum 200 feet from any R district.

      B.   The best practical means known for the disposal of refuse matter or water-carried waste, the abatement of obnoxious or offensive odor, dust, smoke, gas, noise, or similar nuisance shall be employed.

   5.   Area Requirements.

      A.   Lot Area. No minimum.

      B.   Lot Width. No minimum.

      C.   Yard Widths.

         (1)   The minimum front yard shall be 30 feet.

         (2)   The minimum rear yard width shall be 40 feet, unless the rear lot line adjoins a railroad right-of-way, in which case none is required.

         (3)   There is no minimum required side yard, except adjacent to an R District, in which case not less than 200 feet as specified above.

      D.   Building Height. The maximum building height shall be 75 feet. For all building heights greater than 45 feet, the minimum yard width shall be increased one horizontal foot for each vertical foot in excess of 45 feet to the maximum allowed building height.