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Table 2.05.3(3)-1 <br />Historical SCS Curve Numbers for New Horizon Mine <br />COVER DESCRIPTION CURVE NUMBER FOR HYDROLOGIC <br />SOIL GROUP <br />Cover Type Hydrologic B C D <br />Condition <br />Undisturbed Areas: <br />Cultivated Land <br />Poor <br />76 <br />84 <br />88 <br />(Small Grain) <br />Good <br />75 <br />83 <br />87 <br />Rotation Meadow <br />Poor <br />75 <br />83 <br />85 <br />(Contoured) <br />Good <br />69 <br />78 <br />83 <br />Meadow (Riparian) <br />Good <br />58 <br />71 <br />78 <br />Pasture or Range <br />Poor <br />79 <br />86 <br />89 <br />Fair <br />69 <br />79 <br />84 <br />Good <br />61 <br />74 <br />80 <br />Juniper- Grass <br />Poor <br />75 <br />85 <br />89 <br />Fair <br />58 <br />73 <br />80 <br />Upland Sagebrush - Grass <br />Poor <br />67 <br />80 <br />85 <br />Fair <br />51 <br />63 <br />70 <br />Residential: <br />1/8 -acre lots <br />Average <br />85 <br />90 <br />92 <br />1/4 -acre lots <br />Average <br />75 <br />83 <br />87 <br />1/3 -acre lots <br />Average <br />72 <br />81 <br />86 <br />1/2 -acre lots <br />Average <br />70 <br />80 <br />85 <br />1.0 -acre lots <br />Average <br />68 <br />79 <br />84 <br />Disturbed Areas: <br />Newly Graded Areas <br />Average <br />86 <br />91 94 <br />Paved Roads <br />Average <br />89 <br />92 93 <br />Gravel Roads <br />Average <br />85 <br />89 91 <br />Dirt Roads <br />Average <br />82 <br />87 89 <br />Reclaimed Areas: <br />Herbaceous Pre -Law (1977) <br />Average <br />80 <br />87 <br />Herbaceous Post -Law (1977) <br />Average <br />71 <br />81 <br />Source: USDA -SCS Technical Release 55 (2nd Edition), June, 1986 <br />Section 2.05.3(3) Page 9 February 2017 (TR -78) <br />