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PR-12 Exhibit 71 4 <br />2.1.1.1 Deer Creek <br />• Deer Creek is a small ephemeral stream that is tributary to Dry Fork (Map 1). Deer Creek has a <br />watershed area encompassing approximately 1 square mile. The Deer Creek drainage is about 1.6 miles <br />long, extends from an elevation of 8,320 feet to 7,500 feet, and has an average gradient of about 6 <br />percent. <br />MCC began monitoring flows and collecting water quality data in Deer Creek in the spring of 2005. <br />2.1.1.2 Poison Gulch <br />Poison Gulch is a small, narrow ephemeral stream that is tributary to Dry Fork (Map 1). Poison Gulch <br />has a watershed area of approximately 0.3 square miles. The Poison Gulch drainage is about 1.1 miles <br />long, extends from an elevation of 8,200 feet to 7,800 feet, and has an average gradient about 7 percent. <br />MCC began monitoring flows and collecting water quality data in Poison Gulch in the spring of 2005. <br />2.1.2 Lick Creek <br />Lick Creek is a small ephemeral stream that is tributary to Minnesota Creek and is located to the south <br />and upstream of Dry Fork (Map 1). The Lick Creek drainage drains the southern portion of the SOD area <br />and its watershed encompasses an area of approximately 1.9 square miles. The Lick Creek drainage is <br />about 2.8 miles long, extends from an elevation of 9,730 feet to 7,630 feet, and has an average gradient of <br />about 12 percent. Lick Creek is a steep narrow drainage with a limited alluvial valley floor. The incised <br />• channel restricts the width of the alluvium. The relatively steep stream gradient and the presence of <br />sandstone outcrops limit the thickness and presence of alluvium. Lick Creek often has intermittent flows <br />in the upper reaches originating from several springs, but is typically dry in the lower reaches. The Lick <br />Creek water quality data collected to date do not indicate any mining related impacts. The water quality data <br />do, however, reflect natural seasonal variations with respect to levels of iron, manganese, pH, TDS, and TSS <br />being elevated during spring runoff. <br />2.1.3 Deep Creek <br />Deep Creek is a perennial stream that is tributary to Raven Gulch which flows north into the North Fork <br />of the Gunnison River (Map 1). The Deep Creek drainage drains the small northeast arm of the SOD area <br />and the majority of the DFL area and its watershed encompass an area of over 9.4 square miles. Deep <br />Creek is about 5.4 miles long, extends from an elevation of 8,550 feet to 6,600 feet, and has an average <br />gradient of about 6.8 percent. Deep Creek is a steep narrow drainage with a limited alluvial valley floor. <br />The incised channel restricts the width of alluvium. The stream gradient and the presence of sandstone <br />outcrops limit the thickness and presence of alluvium. The baseflow in Deep Creek originates from <br />numerous springs. The Deep Creek Ditch originates at the Little Gunnison River, collects runoff from <br />upper Deep Creek, and transports flows to the upper Dry Fork. Deep Creek water quality data collected to <br />September 2007 f?,•droGeo, Inc. <br />0