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<br /> <br /> <br />the infiftration characteristics of soil types and the type and amount of <br />vegetation. <br />The mine and surrounding land encompasses the fdiowing soil types (Ref: Solis <br />Map, Rockcastle Permit 1981): <br />Soil Name <br />Coutis Fine Sandy Loam <br />Winevada - Splitro Complex <br />Winevada Fine Sandy Loam <br />Skyiick Loam <br />Hvdroloclic Soil Group <br />B <br />C-D <br />C <br />8 <br />Hydrologic Soil Groups were obtained from USDA-SCS TR-55, June 1986, <br />Exhibit 1. <br />Ground cover values were obtained from the Vegetation Monitoring and Bond <br />Release Evaluation prepared by Mr. Kent Crofts for the Grassy Creek Mine. This <br />evaluation is assumed to be the best source for ground cover conditions. The <br />Sagebrush reference area was used to determine Undisturbed and Premine <br />curve numbers. Measured cover values for the reclaimed pits were used to <br />determine the reclaimed curve numbers. <br />Curve numbers were obtained from Procedures for Determining Peak Flows in <br />Colorado and Technical Release No. 55, (USDA-SCS, 1980). Based on soil <br />type and vegetation cover, curve numbers were determined using Table 2-2d, <br />USDA-SCS TR55, for the following conditions: <br />4 <br />