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Probable I lydmlogic Consequences New Elk Mine 9 <br />• for the CD W R wells summarized in Table 4 are shown on Plate 3. AA luvial water levels are also monitored <br />n by the New Elk Mine in four wells new the West Portal Shaft (PAW -1, PAW -2, PAW -3 and PAjj'.1). The <br />` I observed depths to water range from about 7 to 34 feet (New Elk CoalLompany NECC], 2 0099). Seasonal <br />water level Fl th <br />fluctuations are mostly on e order of 1 to 2 feet (Figure 4). <br />'0 PAW -1 PAW -2 <br />s s' <br />o 6 <br />es PAW -8 ° PAW -9 <br />32 a <br />°1 3 1 <br />Figure 4. Depth to Water in Purgatoire Valley Alluvium near East Portal Shaft <br />Well yields for the alluvial aquifer are typically 5 to 15 gpm (Table 4). The highest reported yield is 25 <br />gpm for the domestic well owned by George ChavV The Chavell is located east of the permit <br />boundary near the town of Stonewall. Hydraulic cc uctivity data or alluvium is available from single <br />well tests (8) performed by WWL (1980). WWL reported that the hydraulic conductivity of alluvium <br />generally ranges from 0.014 ft/day to 2 ft/day. One test, however, returned a value of 1,880 ft/day. <br />Water quality data (2001 to 2008) for alluvium adjacent to the Purgatoire River are available from annual <br />monitoring reports prepared for the New Elk mine and are summarized in Table 5 (Picketwire Processing <br />2002 -2007; New Elk Coal Company, 2008 and 2009). Well PAW -1 is located upstream of mining <br />facilities, and monitors water quality unaffected by significant mining. PAW -2, PAW -8, and PAW -9 are <br />located downstream of mining facilities. PAW -2 monitors water quality down gradient from the DWDA, <br />well PAW -8 is down gradient of the RDA, and PAW -9 monitors the overall effects of New Elk mining <br />activities on alluvial groundwater. <br />• <br />4164A.110130 W7�ASSOCAPAw6 <br />PR 02 Exhibit 8(4) Page 130 Revised 1/31/11 <br />O <br />