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West Elk Mine 2007 Annual Hydrology Report 11 <br />• <br />3. 1.1 Upper North Fork Drainage Basin Surface Water Monitoring Stations <br />3.1.1.1 Deep Creek (Upper, Lower) <br />Deep Creek is a perennial stream drainage that drains the Box Canyon mine panel area and the east <br />side of the SOD and West Flatiron areas. The Upper Deep Creek monitoring station does not have <br />a flume or data logger and is located up-gradient of the Box Canyon mine panel area (mine panels <br />14 - 17 and 22 - 24) and the West Flatiron area. The Lower Deep Creek monitoring station does <br />not have a flume or data logger and is located down-gradient of the SOD area and is directly east of <br />the Box Canyon panels (Map 2). In 2006, the flow monitoring at the Deep Creek monitoring sites <br />was changed from continuous flow recording to instantaneous recording three times a year. This <br />change was made for two reasons: mining in this area is nearly complete and the Deep Creek <br />stream channel is highly variable, resulting in continuous flow data that are unreliable and that do <br />not represent actual conditions. <br />3.1.1.2 Raven Gulch (Upper. Lower) <br />L <br />Raven Gulch is a perennial stream that drains the east side of the West Flatiron Tract. The Upper <br />Raven Gulch monitoring station was established in 2005, and is located upstream from the <br />confluence with the West Flatiron drainage. The Lower Raven Gulch monitoring station was also <br />established as a new site in 2005 and is located at the mouth of Raven Gulch near its confluence <br />with the North Fork of the Gunnison River. Neither of the Raven Gulch monitoring stations have a <br />flume or data logger. The locations of these monitoring sites are depicted on Map 2. Monitoring <br />of the Upper and Lower Raven Gulch monitoring stations began in May 2005. <br />3.1.1.3 Box Canes <br />Box Canyon is an ephemeral stream drainage. The upper reach of the drainage is typically dry and <br />the lower reach of the drainage only flows during storm events and during the spring months in <br />above average precipitation years. The Box Canyon monitoring station is located at the mouth of <br />the drainage and was established to monitor the area down-gradient of the Box Canyon panel area <br />(Map 2). There is no flume or data logger in Box Canyon and monitoring of this site began in <br />1999. <br />• <br />June 2008 <br />HydroGeo, Inc.