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Su mmary <br />4P 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 />NOR 006610 <br />7 -6 -7 -7 ! <br />Peak Sediment <br />Peak Settleable <br />Sediment <br />Concentration <br />Concentration <br />Location <br />(tons) <br />(mg /1) <br />(mg /1) <br />Old Boneyard <br />0.0 <br />1016 <br />0.22 <br />New Boneyard <br />NW Fence <br />0.0 <br />329 <br />0.0 <br />SW Fence <br />0.0 <br />332 <br />0.11 <br />Gate <br />0.0 <br />260 <br />0.09 <br />Office <br />0.0 <br />248 <br />0.08 <br />NOR 006610 <br />7 -6 -7 -7 ! <br />