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Probable Hydrologic Consequences New Elk Mine 9 <br />for the CDWR wells summarized in Table 4 are shown on Plate 3. Alluvial water levels are also monitored <br />by the New Elk Mine in four wells near the West Portal Shaft (PAW -1, PAW -2, PAW -3 and PAW -4). The <br />observed depths to water range from about 7 to 34 feet (New Elk Coal Company [NECC], 2009). Seasonal <br />water level fluctuations are mostly on the order of I to 2 feet (Figure 4). <br />PAW -1 PAW -2 <br />+o w <br />6 6 <br />o fi e t3 <br />PAW -8 t PAW -9 <br />3 <br />a s ' ° a 16 .` I II - -�� �•y ,.. <br />$ ii �1 �✓ <br />4 <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 Chaves. The Chaves well is located east of the permit <br />boundary new the town of Stonewall. Hydraulic conductivity data for 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 0/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 />4164A,110421 Whetstone Attociater 6 <br />TD 44 F-r.:6ir PrA\ 0— 1 In 3 nn 13 <br />