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Exhibit 71 Hydrologic Chazacterization South of the Divide Area and Monitoring Plan 20 4.3.3.3 Deer Creek Deer Creek is an ephemeral stream that is tributary to the Dry Fork and only flows in response to storm events and spring runoff. Deer Creek flows into Dry Fork, upstream of Minnesota Reservoir and downstream of the Middle Dry Fork monitoring station. Deer Creek is located in the SOD azea. The Deer Creek monitoring station was established as a new monitoring location in the spring of 2005 (Map I). Baseline monitoring of Deer Creek began in May 2005 and included measuring flow, collecting field water quality data, and collecting samples for laboratory water quality analyses from May through October 2005 (CDMG, 2005b). Routine monitoring of Deer Creek is scheduled to begin in 2006. 4.3.3.4 Poison Gulch Poison Gulch is an ephemeral stream that is tributary to the Dry Fork and only flows in response to storm events and spring runoff. Poison Gulch flows into Dry Fork between the Middle and Upper Dry Fork monitoring stations. Poison Gulch is located in the SOD area. The Poison Gulch monitoring station was established as a new monitoring location in the spring of 2005 (Map 1). Baseline monitoring of Poison Gulch began in May 2005 and included measuring flow, collecting field water quality data, and collecting samples for laboratory water quality analyses from May through October 2005 (CDMG, 2005b). Routine monitoring of Poison Gulch is scheduled to begin in 2006. 4.3.3.5 Horse Gulch and East Gulch East ofHorse Gulch Horse Gulch and East Gulch, East of Horse Gulch are ephemeral stream drainages that are tributary to the Dry Fork and flow only in response to storm events and spring runoff. These streams flow into Minnesota Reservoir and drain the SE mine panel area and the area located within the SOD area. This monitoring station was established in 1977 and is located north of Minnesota Reservoir (Map 1). 4.3.3.6 Upper and Lower Minnesota Creek Minnesota Cteek is the major stream that drains the southern WEM area. There aze two monitoring stations in Minnesota Creek: Upper Minnesota Creek, located upstream of Dry Fork; and Lower Minnesota Creek, located downstream of Dry Fork. The Upper Minnesota Creek monitoring station was established by the USFS in 1977 to collect baseline data for the SOD azea and to support the Minnesota Creek Augmentation Plan. These two stations monitor the hydrologic effects of mining the SE mine panel azea (Map 1) and ultimately the SOD mining. 4.3.4 New Stream Monitoring Sites 4.3.4.1 Deep Creek Ditch Deep Creek Ditch is a trans-basin diversion ditch that routes water from the Little Gunnison River to upper Dry Fork to provide irrigation water for users in the Minnesota Creek basin. The average annual diversions for the Deep Creek Ditch aze about 1,000 ac-ft. A flume and continuous recording device will Apri12006 HydroGeo, Ine.