Laserfiche WebLink
Exhibit 71 Hydrologic Characterization South of the Divide Area and Monitoring Plan 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 squaze 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 azea 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 />i and its watershed encompasses an azea of approximately 1.9 squaze 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 azea <br />and its watershed encompasses an area of over 9.4 squaze miles. Deep Creek is about 5.4 miles long, <br />extends from an elevation of 8,550 feet to 6,600 feet, and has an average gradient of about 6.8 percent. <br />Deep Creek is a steep narrow drainage with a limited alluvial valley floor. The incised channel restricts <br />the width of alluvium. The stream gradient and the presence of sandstone outcrops limit the thickness and <br />• presence of alluvium. The baseflow in Deep Creek originates from numerous springs. The Deep Creek <br />Ditch originates at the Little Gunnison River, collects runoff from upper Deep Creek, and transports flows <br />Apri12006 HydroGeo, /na <br />