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1'ho effect will be to reduce sediment yield Cror,r <br />• disturbed areas to less tl;au 15 pcrcr:nt oi'. estimated <br />pre-mining rates (fable 4). Appropriate sediment <br />control ~[rictures and sedimc•nts;tion ponds must be <br />maintained until reclamation is completed and the <br />~ required erosional stability is achieved. <br />Field observations show tract C-3664~ to be extra^~eiy <br />1 stable, primarily because or' tine deep soils and good <br />plant cover. It is doubtful that this tract, once <br />i <br />disturbed by mining, can be recl~:imed so as to be as <br />stable as the pre-mining surface. Increased sod-_-~ent <br />yield from this tract, however, would be largely <br />~ deposited in and adjacent to channels downstream :with <br />i <br />very little of that sediment reaching Trouc Cree and <br />the Yampa River. <br />I' <br />Tract C-26913 is less stable and probably can be <br />~ satisfactorily restored to approximate pre-mining <br />conditions. <br />Tracts C-226)6 east and west are moderately eroding <br />i <br />as a whole with considerable erosion occurring on the <br />steeper slopes. Successful reclamation of disturbed <br />areas in these tr:!.ts can be expected to decrease <br />pre-mining sediment yield by at least 25 percent. <br />Trot lone,-term sediment yield from the proposed lease <br />127 <br />.. .. <br />• ~•. <br />