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• Summary <br />The results of the SEDCAD+ computer analysis indicates that the <br />runoff from the disturbed areas will contain sediment. As stated <br />earlier, this method of sediment estimation is an approximation. <br />The SEDCAD+ computer model is the most widely used and excepted <br />method. Extensive verification has not been done for runoff from <br />areas such as those discussed above. Peabody Coal Company, in an <br />attempt to reduce the amount of sediment running off from an area, <br />will install silt fences. The numerical benefit ($ efficiency) of <br />this practice has not been completely verified, but from a <br />practical aspect the placement of silt fences will obviously <br />prevent a portion of the sediment from leaving the disturbed area. <br />The following is a brief summary of the SEDCAD+ sedimentology <br />results using silt fences as the filtering medium. <br />• Peak Sediment Peak Settleable <br /> Sediment Concentration Concentration <br />Location (tons) (m4/1) (mq/1) <br />Old Boneyard 0.0 1016 0.22 <br />New Boneyard <br />NW Fence 0.0 329 0.0 <br />SW Fence 0.0 332 0.11 <br />Gate 0.0 260 0.09 <br />Office 0.0 248 0.08 <br />• <br />7-6-7-7 <br />