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height of grass was selected as 7 inches, Manning's n = 0.014, infiltration = 0.03, and <br />stiffness factor of 20. The size of the representative filter is 100 long, 100 feet wide, at a <br />slope of 3%. <br />4.10 Comparisons of Water Quality <br />SEDCAD+ demonstration results are presented in Table 4.10-1. <br />Table 4.10-1 Peak Sediment Concentrations, Facilities Area <br />Parameter Pre-Mining Reclaimed <br /> Rangeland Exhibit 5 1996 Vegetation <br /> Reference Description Survey <br />Peak Sediment 179' 8952 1800' <br />Concentration <br />(SCP) (m,4~) ! I <br />SEDCAD+ Demonstration File Name: C:\SEDCAD3\CR\FACPF, 09-25-1996, 08:24:05, <br />Appendix D <br />SEDCAD+ Demonstration File Name: C:15EDCAD3\CRIFACPF2, 10-04-1996, <br />15:08:23, Appendix E <br />SEDCAD+ Demonstration File Name: C:\SEDCAD3\CR\FACRF2, 09-10-1996, <br />09:23:55, Appendix F <br />SEDCAD+3 modeling does not recognize the decrease in sediment loading due to detention <br />of runoff on the facilities bench area. The accumulation of no sediment in Sediment Trap <br />A suggests that runoff from the Facilities Area to receiving water may be of equal quality <br />to pre-mining conditions. <br />5. EAST PIT AREA <br />5.1 Area <br />The East Pit Area (see Map, 1996 Phase II Bond Release Area) is bound on the north by <br />Ditch 3N2; on the east by the drainage divide between the East Pit and East Slope Areas; <br />on the south by the roads associated with Ditches 2S2c, 2S2b, 2S2a; on the west by Ditches <br />25 and 2Na; and on the north by Ditch 2Nb. The size of the East Pit Area (reclaimed <br />disturbed land) is 30.04 acres. <br />Page I6 of 34, 7 Oct 96 <br />