2008-03-21_PERMIT FILE - C1980007A (47)

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PR-12 Exhibit 71 22 ditch in October 2006. Baseline monitoring of the Deep Creek Ditch Flume began in 2006 and included 40 measuring flow, collecting field water quality data, and collecting samples for laboratory water quality analyses (CDMG, 2005b). Routine monitoring at this location began in 2007. Data from this station will provide information on trans-basin flows versus natural Dry Fork flows 4.3.4.2 MhMesota Reservoir Flume MCC installed a new Parshall flume and a Global Water WL-16 continuous recorder on the lower Dry Fork at the high water line of Minnesota Reservoir in October 2006. This monitoring station will provide more accurate and more representative monitoring data since it wouldn't be influenced by variations related to reservoir activities. Baseline monitoring of the Minnesota Reservoir Flume began in 2006 and included measuring flow, collecting field water quality data, and collecting samples for laboratory water quality analyses (CDMG, 2005b). Routine monitoring at this location began in 2007. 4.3.4.3 South Prom Creek South Prong Creek is an ephemeral stream that is tributary to upper Minnesota Creek. The north fork of South Prong Creek drains the southern portion of the SOD area. The monitoring station on South Prong Creek is located at the mouth of the drainage (Map 1) and preliminary monitoring was initiated in 2005. Baseline monitoring is scheduled to resume in 2017, or at least one year prior to when mining begins in the area to monitor potential mining induced impacts. • 4.4 Spring and Seep Monitoring Currently, there are 24 springs and seeps in the WEM hydrologic monitoring program. MCC added 5 new spring monitoring sites in the SOD (Deer Creek Spring, WCC-24, J-2, J-7, and 35-3) area in 2006 and 3 new springs (Deep Creek Spring #2, Deep Creek Trail Spring, and 96-2-2 Area Spring) in 2007. The locations of the 8 new monitored springs were selected based on spring surveys completed by WWE (1997 and 2005) and/or based on long term continuous flow data records and on projected mine development plans. The spring and seep monitoring plan is divided into four general hydrologic categories for discussion purposes: o Springs and seeps in the North Fork drainage basin issuing from the strata above the F-Coal Seam. o Springs and seeps in the North Fork drainage basin issuing from strata in or below the F-Coal Seam. o Springs and seeps in the Jumbo Mountain area in the North Fork drainage issuing from strata above the B-Coal Seam. o Springs and seeps in the Dry Fork drainage issuing from strata above the E-Coal Seam. The locations of the spring and seep monitoring stations are shown on Map 1. The following discussion of monitored springs is presented according to the general hydrologic categories described above and is presented from upstream to downstream relative to the WEM. A summary of the spring and seep monitoring program details is presented in Table 80. September 2007 HrdroGeo, Inc. •