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G.2 HYDROLOGIC CONDITIONS <br />G.2.1 Introduction <br />The sources of information utilized for development of this report include <br />existing United States Geological Survey (USGS) publications, data made <br />available from previous Multi Mineral Corp, programs, investigations from <br />the Bulk Sampling activity currently being conducted, and other sources <br />listed at the end of this section. <br />G.2.2 Surface Water <br />G.2.2.1 Regional Setting <br />The proposed operation is situated within the Yellow Creek drainage basin <br />(see Exhibit B). This basin is approximately 165,100 acres in extent, and <br />receives a total annual precipitation of approximately 215,500 acre/feet. <br />The bulk of this precipitation is lost to evapotranspiration. Based on U.S. <br />Geological Survey stream gage data, the mean average discharge from the <br />Yellow Creek Drainage basin is approximately 1,130 acre/feet, and the <br />primary source of streamflow to Yellow Creek is groundwater discharge (Weeks <br />and Welder 1974). Recharge of the groundwater system is primarily from <br />snowmelt. Approximately 80 percent of streamflow is being supplied by <br />groundwater (Weeks el: al. 1974). <br />G.2.2.2 Site Drainage <br />The proposed mining area is situated on a small upland surface immediately <br />adjacent to one of the ephemeral drainages (see Exhibit B). Vegetation at <br />this location is generally pinyon-juniper and big sagebrush shrubland. <br />Erosion from these areas is typically moderate to high, particularly in <br />response to significant precipitation events. <br />Surface drainage from the site is controlled by a series of ephemeral <br />• streams, all of which trend generally to the north into Yellow Creek. <br />Yellow Creek is formed by the confluence of Corral Gulch and Stake Springs <br />G-22 <br />