The following ammonium nitrate materials or products may be loaded, discharged, transferred, stored, stowed, or otherwise handled on, in, or from any vessel or ship or waterfront facility of any kind or description in or on the Patapsco River or any of its tributaries: Ammonium nitrate carbonate mixtures, composed of approximately 60% by weight of ammonium nitrate and 40% by weight of fine carbonate (precipitated calcium carbonate, chalk, ground limestone, or ground dolomite) and having approximately 20.5% available nitrogen. Mixed fertilizers, containing up to 60% by weight of ammonium nitrate, and often other nitrogen compounds with either or both phosphate and potash compounds, without organic filler. Nitrogen solutions of the types generally used in the manufacture of mixed fertilizers referred to in item (2) immediately above. Ammonium nitrate-calcium nitrate mixtures composed of approximately 50% of ammonium nitrate and 50% of calcium nitrate. Ammonium nitrate sulfate mixtures composed of not more than 40% of ammonium nitrate and 60% of ammonium sulfate. Ammonium nitrate phosphate fertilizers, containing less than 60% ammonium nitrate, without organic fillers, and not otherwise classified as dangerous under Interstate Commerce Commission regulations. Ammonium nitrate (in the form of prills, crystals, grains, or flakes) dynamite grade, fertilizer grade, nitrous oxide grade, and technical grade, all without organic coating, packaged in substantial metal barrels or drums. City Code, 1966, art. 10, §91(b) 1976/83, art. 10, §91(b) Ord. 58-1651