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4.3 WASTE DISPOSAL <br />Two general types of wastes are disposed of at Trapper Mine. Disposal of wastes generated at the <br />minesite is discussed in Section 4.3.2. Utility waste disposal is discussed in Section 4.3.4. <br />4.3.1 Disposal Sites <br />Waste will be disposed at Trapper Mine in three kinds of disposal sites including (1) the bottom of the <br />pits, (2) the "veer" of the spoil piles (between the ungraded spoil ridges), (3) or the dragline benches. <br />Because of the geological and chemical composition of the overburden, interburden and coal found within <br />the permit area, there should not be any acidic or toxic material encountered or formed during mining <br />operations. (For further detail on the composition of the materials in the permit area, refer to Sections <br />2.7.1, 2.7.2 and 2.7.3). The pit depths vary from 20 feet to 150 feet Any waste disposed on the bottom <br />of the pits will therefore have an effective cover of at least 20 feet All wastes will be disposed of in a <br />controlled manner. No waste material will be disposed in embankments or impoundments or in the north <br />(downslope) end of the bottom of the pits. Also, no waste disposal sites will be located within eight feet of <br />any coal croplines or coal storage areas. <br />The final cut in Enfield Pit will be used extensively for waste disposal, especially for utility wastes. Refer <br />to Section 4.3.4 for more detail. <br />• <br />4.3.2 Wastes Generated at the Mine Site <br />Trapper Mine will generate solid wastes, petroleum wastes and sewage wastes. The first two are dis- <br />cussed in detail in the following sections. The sewage <br />4-13 <br />~~q~ <br />