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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 minesite <br /> 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 pits, <br /> (2)the "vees" of the spoil piles (between the ungraded spoil ridges), (3) or the dragline benches. Because <br /> of the geological and chemical composition of the overburden, interburden and coal found within the permit <br /> area,there should not be any acidic or toxic material encountered or formed during mining operations. (For <br /> further detail on the composition of the materials in the permit area, refer to Sections 2.7.1,2.7.2 and 2.7.3). <br /> The pit depths vary from 20 feet to 150 feet. Any waste disposed on the bottom of the pits will therefore <br /> have an effective cover of at least 20 feet. All wastes will be disposed of in a controlled manner. No waste <br /> material will be disposed in embankments or impoundments or in the north (downslope) end of the bottom <br /> of the pits. Also, no waste disposal sites will be located within eight feet of any coal croplines or coal storage <br /> areas. <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 discussed <br /> in detail in the following sections. The sewage <br /> 4-13 <br /> Revision: TR-126 <br /> Approved: <br />