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• <br />/5 - <br />TABLE 1 <br />LORENCITO CANYON MINE <br />LORENCITO <br />HYDROLOGIC RESPONSE VALUES FOR SOIL ASSOCIATIONS <br />Sail Series or Association Hydrologic Group Hydrologic Group for Association <br />Shawa B B <br />Tra B B <br />Fu hes C C <br />Louvier D D <br />Sarcillo D <br />Tra B <br />Fuera C D <br />Dargol D <br />V amer D <br />Saruche D D <br />Rombo C <br />Louviers <br />/ D D <br />Q <br />Rombo <br />~ ` C <br />{ <br />Travessilla 1 D <br />Manzano B B <br />Haverson B B <br />• Source: USDA, NRCD, 1996. <br />TABLE2 <br />LORENCITO CANYON MINE <br />CURVE NUMBERS ASSOCIATED WITH VEGETATION TYPES <br /> Curve Number CN ~ <br /> H drolo is Soil Grou <br />Cover g C D Descri tion <br />Grassland 62 74 80 Arid and semi-arid range lands, sagebmsh <br />with rass understo , 27% cover. <br />Oak Pinyon 51 60 69 Arid and serrv-arid range lands, oak-aspen, <br />45% cover. <br />Mountain Shrub 56 65 73 Arid and semi-arid range lands, oak-aspen <br />35% cover. <br />Ponderosa Pine 65 71 83 Ponderooa Pine, 20% cover. <br />Ex osed Rock 95 95 95 <br />Disturbed Areas <br />Roads and Pads 85 89 9I Im ervious areas, avel roads. <br />To Soil Salva a Areas 86 9l 94 Fallow, Bare Soil <br />Revegetated 75 83 86 Small Grain, straight row and crop residue, <br />oor condition <br />Colorado SCS, 1986 <br />The curve numbers originally used in the evaluation of watershed runoff in Lorencito Canyon were <br />. derived from SCS Curve Number tables in Technical Release 55 (as noted in Exhibit 14); however, <br />results showed these values to be overly conservative. Using CNs of 83 and 73 (ponderosa pine and <br />(revised 4/20/01) <br />