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~.i <br />EROSION CONTROL PLAN <br />for the <br />FILL OUTSLOPES <br />at the <br />ORCHARD VALLEY WEST MINE <br />This report provides a detailed plan for controlling erosion on the fill <br />outslopes at the Orchard Valley West Mine immediately following construction <br />and during operation. <br />The soils proposed for use in both the temporary revegetation of the <br />fill outslopes and 1n final revegetation of the entire mine site upon <br />abandonment are principally found in mapping unit 34, Delson very stony loam, <br />20-60 percent slopes of the Soil Conservation Service, Soil Survey of the <br />Paonia Area. This survey indicated that natural erosion from these soils is <br />• approximately 5 tons/acre/year. It is the goal of this plan to control <br />erosion such that the naturally occurring erosion value of 5 tons/acre/year <br />is not exceeded following construction and during operation. <br />The Universal Soil Loss Equation (LISLE) was used to determine the amount <br />of soil loss from the outslopes during various phases of construction and <br />operation. The soil loss equation is A= R K L S C P where: <br />A =computed soil loss in tons/acre/year <br />R = rainfall factor <br />K = soil erodibility factor <br />L = slope length factor <br />S = slope gradient factor <br />• C = cover management factor <br />P = erosion control practice factor ' <br />