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1 <br />999 <br />' Doc Date:1211112001 <br />SOMERSET MINING COMPANY <br />1994 ANNUAL HYDROLOGIC MONITORING REPORT <br />Introduction <br />' Somerset Mining Company operates the Sanborn Creek Mine and the now <br />abandoned Somerset Mine. The surface facilities are located <br />' immediately north of the Town of Somerset. The Sanborn Creek Mine <br />portals are located about one mile east of Somerset, Colorado near <br />State Highway 133. <br />' The Somerset Mine, Sanborn Creek Mine, and surface facilities are <br />located within the North Fork of the Gunnison River drainage, which <br />drains generally westward to the Gunnison River, which is a <br />' tributary to the Colorado River. The North Fork drainage ranges in <br />altitude from 5,550 feet to 12,000 feet and drains 1,253 square <br />miles, producing an average annual discharge of some 470,000 acre <br />' feet of water or an average discharge of about 650 cubic feet per <br />second (Department of Agriculture 1962). The average annual <br />discharge of the North Fork of the Gunnison River at the U.S. <br />Geological Survey gauging station 2.3 miles east of Somerset is <br />' 313,300 acre feet of water, or an average discharge of 457 cubic <br />feet per second. Peak flows generally occur in May as a result of <br />snowmelt with minimum flows during the winter months. <br />' Surface drainage from the permit area runs directly to the North <br />Fork of the Gunnison River. One perennial, three intermittent, and <br />t eight ephemeral creeks and gulches drain the permit area. From <br />west to east, the creeks shown on drawing E8-3286 are known as: <br /> Hubbard Creek Perennial <br /> Hear Creek Intermittent <br />' Elk Creek Intermittent <br /> Sanborn Creek Intermittent <br /> Unnamed Drainage Ephemeral <br /> Coal Gulch Ephemeral <br /> A-Gulch Ephemeral <br /> B-Gulch Ephemeral <br /> C-Gulch Ephemeral <br /> Hawksnest Creek Ephemeral <br /> Hoopla Gulch Ephemeral <br />' Bardine Canyon Ephemeral <br />' Monitoring <br />The hydrologic monitoring parameters and the schedules for the <br />hydrologic monitoring program are presented in Appendix 1. The <br />' parameters and schedule were changed during the year by Technical <br />Revision No. 20, effective in May. <br />' Field parameters for groundwater are depth to water level, pH, <br />conductivity, and temperature. Field parameters for surface water <br /> <br />