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West Elk Mine 2007 Annual Hydrology Report 15 <br />• <br />3.1.4 New Stream Monitoring Sites Established in WY 2005 & WY 2006 <br />3.1.4.1 Deep Creek Ditch Flume <br />Deep Creek Ditch is a trans-basin diversion ditch that routes water from the Little Gunnison River <br />to Upper Dry Fork in order to provide irrigation water for users in the Minnesota Creek Basin. The <br />average annual diversions for the Deep Creek Ditch are about 1,000 ac-ft. A flume and continuous <br />recording device were installed in this ditch in the fall of 2006 (Map 2). Baseline monthly <br />monitoring of the Deep Creek Ditch Flume began in the summer of 2006 and included measuring <br />flow, collecting field water quality data, and collecting samples for laboratory water quality <br />analyses from the installation date through October 2006. Routine monitoring (three times per <br />year) at this site began in WY 2007. Data from this station will provide information on trans-basin <br />flows versus natural Dry Fork flows. <br />3.1.4.2 Minnesota Reservoir Flume <br />MCC installed a new 30-inch Parshall flume and a data logger on the lower Dry Fork above the <br />• high water line of Minnesota Reservoir in October 2006 (beginning of WY 2007) (Map 2). The <br />Minnesota Reservoir Flume monitoring station provides more accurate and more representative <br />monitoring data since it isn't influenced by variations related to reservoir activities. Baseline <br />monthly monitoring of the Minnesota Reservoir Flume began in the spring of 2006 and included <br />measuring instantaneous flow, collecting field water quality data, and collecting samples for <br />laboratory water quality analyses from April 2006 through October 2006 (CDMG, 2006). Routine <br />monitoring (three times per year) at this location began in WY 2007. <br />3.1.4.3 South Prong Creek <br />South Prong Creek is an ephemeral stream that is tributary to upper Minnesota Creek. The north <br />fork of South Prong Creek drains the southern portion of the SOD area. The monitoring station on <br />South Prong Creek is located at the mouth of the drainage and does not have a flume or data logger <br />(Map 2). Preliminary flow and water quality data were collected at a one time sampling round of <br />this site in 2005 (HydroGeo, 2006). Baseline monitoring is scheduled to resume in 2017, or at least <br />one year prior to when mining begins in the area to monitor potential mining induced impacts. <br />• <br />June 2008 HydroGeo, Inc.