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~J <br />J <br />Percent Ground Cover CP Factor <br />60 0.042 <br />72.7 0.023 <br />80 0.013 <br />6 67.5% ground cover, East Pit Eas[ Slope (Phase II 93), interpolated as follows: <br />Percent Ground Cover CP Factor <br />60 0.042 <br />67.5 0.03 [ <br />80 0.013 <br />~ 77.7% ground cover, Dryland Reference Area (Phase II 93), interpolated as follows: <br />Percent Ground Cover CP Factor <br />60 0.042 <br />77.7 0.016 <br />80 0.013 <br />e 64.3% ground cover, Barren Ridge Area (Phase II 93), interpolated as follows: <br />Percent Ground Cover CP Factor <br />60 0.042 <br />64.3 0.036 <br />80 0.013 <br />The sedimentation ponds were designed and constructed to treat flows and sediment loads greater <br />than those expected from current conditions (reclaimed lands). This review sets design sediment <br />volumes to elevations commensurate with current requirements, above original design pond <br />bottoms. <br />7-2 Alluvial Valley Floor (AVF) <br />The SEDCAD+ Version 3 demonstration appropriate to this area is C:\SEDCAD3\CR7\SEDA10, <br />dated 01-29-1996 Time 13:51:47. Drainage is directed towards a Sediment Trap (southwest <br />comer of the Permit Area) via overland flow and Ditches lA and 1B. Watersheds include hay <br />meadows, the industrial facilities areas, small areas above the industrial facilities area below <br />Ditches 2S2a, 2S2b, and 2S2c and the highway, and contributing portions of the highway itself. <br />. Flows approach the Sedimentation Trap from three general directions, all through reaches of hay <br />meadow. Grass filter analyses demonstrate the effectiveness of only 20 feet of filter, the <br />maximum Peak Settleable Concentration being 0.03 mUl (from the areas directly to the south and <br />7-5 8 May 1996 <br />