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from the original Pond 007 watershed, so the Pond 007 watershed has been reduced to about <br />423 acres. Because of this significant reduction in area (17.7 %), new run -off calculations for <br />Pond 007 were not done. <br />TABLE 2.05.3(3) -1 <br />SCS CURVE NUMBERS <br />FOR NEW HORIZON MINE <br />MONTROSE COUNTY, COLORADO <br />HYDROLOGIC SOIL GROUP <br />LAND USE - HYDROLOGIC <br />VEGETATION TYPE CONDITION <br />A <br />B <br />C <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 <br />94 <br />Paved Roads <br />Average <br />89 <br />92 <br />93 <br />Gravel Roads <br />Average <br />85 <br />89 <br />91 <br />Dirt Roads <br />Average <br />82 <br />87 <br />89 <br />Reclaimed Areas: <br />Herbaceous Pre -Law (1977) <br />Average <br />80 <br />87 <br />-- <br />Herbaceous Post -Law (1977) <br />Average <br />71 <br />81 <br />-- <br />Source: USDA -SCS Technical Release 55 (2nd Edition), June, 1986 <br />(Revised ,tune 2010) 2.05.3(3) -10 <br />