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<br />Exhibit C - Site Description - Water Information <br />The operation is expected to have a minimal impact on the prevailing <br />hydrologic balance. The removal of a portion of the waste rock pile on the <br />southerly end of the site (refer to Exhibit C) will probably have a minimal <br />positive impact on the drainage. <br />Surface runoff from most of the permit area occurs primarily during <br />periods of snowmelt and summer storms. Runoff from the affected area <br />occurs as overland flow but is of relatively low velocity due to the coarse <br />texture of the surface and relatively short broken slopes caused by the <br />presence of the waste rock dump. The waste rock dump itself has a high <br />capability of water transmission due to its coarse texture and a <br />correspondingly low runoff potential. The slope above the mine to the east <br />is steep (60± percent) but is forested and contains a cover of forest <br />litter over the soils. The soils are rated as belonging to hydrologic soil <br />group B (moderate infiltration rates, moderately well drained to well <br />drained and moderate runoff potential) according to the Engineering <br />Handbook, Hydrology, Sec. 4, Part I, Soil Conservation Service, USDA. The <br />same soils are rated as medium for the detention storage of water. These <br />soil characteristics and the vegetation type and ground cover on this slope <br />probably work to attenuate raindrop impact and runoff. As such there are <br />no eroded gulleys on the slope and no geomorphic evidence that upslope <br />runoff has been a problem relative to the mine site. <br />' Gold Creek is a relatively small perennial stream that passes to the <br />west of the permit area. The stream drains an estimated 12 square miles <br />' above the mine and its discharge is substantially affected by snowmelt. At <br />the time of the field visit in mid-August, 1987, the stream had an <br />1 <br />i ~ _,~_ <br />