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• <br />• <br />• <br />West Elk Mine 2010 Annual Hydrology Report 14 <br />3.1.1 Upper North Fork Drainage Basin Surface Water Monitoring <br />Stations <br />3.1.1.1 Deep Creek (Upper, Lower) <br />Deep Creek is a perennial stream drainage that drains the Box Canyon B -seam <br />longwall panel area, and the east side of the South of Divide (SOD) and West Flatiron <br />mine plan areas. The Upper Deep Creek monitoring station does not have a flume or data <br />logger and is located up- gradient of the Box Canyon longwall panel area (B -seam panels <br />14 — 17 and 22 — 24) and the West Flatiron area. The Lower Deep Creek monitoring <br />station does not have a flume or data logger and is located down- gradient of the SOD area <br />and is directly east of the Box Canyon panels (Map 2). In 2006, the flow monitoring at the <br />Deep Creek monitoring sites was changed from continuous flow recording to instantaneous <br />recording three times a year. This change was made for two reasons: mining in this area <br />was nearly complete and the Deep Creek stream channel is highly variable, resulting in <br />continuous flow data that were unreliable and that did not represent actual conditions. <br />Monitoring of the Upper and Lower Deep Creek monitoring stations began in 1996. <br />3.1.1.2 Raven Gulch (Upper, Lower) <br />Raven Gulch is a perennial stream that drains the east side of the West Flatiron <br />mine plan area. The Upper Raven Gulch monitoring station was established in 2005 and is <br />located upstream from the confluence with the West Flatiron drainage. The Lower Raven <br />Gulch monitoring station was established as a new site in 2005 and is located at the mouth <br />of Raven Gulch, near its confluence with the North Fork of the Gunnison River. Neither <br />of the Raven Gulch monitoring stations have a flume or data logger. The locations of these <br />monitoring sites are depicted on Map 2. Monitoring of the Upper and Lower Raven Gulch <br />monitoring stations began in 2005. <br />3.1.1.3 Box Canyon <br />Box Canyon is an ephemeral drainage. The upper reach of the drainage is typically <br />dry and the lower reach of the drainage only flows during storm events and during the <br />spring months in above average precipitation years. The Box Canyon monitoring station is <br />located at the mouth of the drainage and was established to monitor the area down - gradient <br />of the Box Canyon B -seam panel area (Map 2). There is no flume or data logger in Box <br />Canyon and data have been collected at this site since 1999. <br />July 2011 HydroGeo, Inc. <br />