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Exhibit 71 Hydrologic Characterization South of [he Divide Area and Monitoring Plan 29 <br />flow, collecting field water quality data, and collecting samples for laboratory water quality analyses from <br />May through October 2006 (CDMG, 2005b). Routine monitoring at this location will begin in 2007. <br />4.5 Ground Water Monitoring <br />Currently, there aze 27 monitored wells in the WEM ground water monitoring plan, including the SOM- <br />23-H-1, SOM-23-H 2, and SOM-23-H 3 wells that MCC re-introduced into the monitoring program in <br />2005. Well SOM-23-H-4 was monitored in 2005, however, although there was audible water flowing in <br />well, the well casing was damaged at depths of 135 feet, 145 feet, and 190 feet and it was completely <br />obstructed at 243 feet (original depth was 604 feet). As a result, monitoring data collected from this well <br />is suspect and the well will not be monitored in the future. <br />In September 2003, MCC installed five monitoring wells (Upper Dry Fork Alluvial, Lower Dry Fork <br />Alluvial, SOM-3E, SOM-3B, and 03-11-1). Baseline data for these new wells were collected from <br />October 2003 to September 2004 and aze presented in the 2004 Annual Hydrology Report (AHR) <br />(HydroGeo, 2005) and shown in Appendix C. <br />The ground water monitoring wells aze divided into the following 6 categories for discussion purposes: <br />o Facility Area Wells and Alluvial Wells <br />o Wells completed in the Barren Member above the F Seam <br />• o Wells completed in the F Seam <br />o Wells completed in the E Seam <br />o Wells completed above the E Seam <br />o Wells completed in the B Seam <br />The locations of the ground water monitoring wells are shown on Map 1. A summary of the ground <br />water monitoring well chazacteristics is presented in Table 3 and a summary of the ground water <br />monitoring plan is presented in Table 9. <br /> <br />Apri12006 HydraGeo, Ine. <br />