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RULE 2- PERMITS <br />the Yampa Bed exhibited a vertical hydraulic conductivity of 2.8x 10 -t ft /d, about the same as or less <br />• than that of the shales reported by Williams and Clark (1994). <br />The spoils aquifer in the Seneca II spoils adjacent to the proposed underground mining activities is <br />upgradient of and in hydrologic connection with the units to be disturbed by the mining. However, <br />as described below and, in greater detail, by Williams and Clark (1994), it is unlikely to be <br />detectably impacted by the proposed PSCM activities. The spoils aquifer receives about ten times <br />the recharge as adjacent undisturbed bedrock areas (approximately 3 inches per year, versus 0.31 <br />inch per year in other areas, according to Williams and Clark, 1994). The spoils aquifer also has a <br />hydraulic conductivity hundreds of times greater than that of the undisturbed bedrock. Because of <br />these factors, the spoils aquifer is saturated to the elevation of the down -dip low wall of the spoils - <br />filled reclaimed mine pit, and "overflow" exits the spoils aquifer as springs at the low points in the <br />low wall adjacent to Little Grassy Creek. <br />- - 12- MOntn6 DrzwGwen EnpeWK —25 Mm1M C,w.W.n -Dente K <br />- 0- I7.MonNS Draw r) HigrK 26NO IMLY wC wn H1hK <br />!- 124onft0ra d vn -LO K MMOnlrtspaw.o LOwK <br />1200 . <br />-: <br />600 <br />• a: <br />v 600 <br />z <br />a <br />09 <br />Diaunac fn,.1 vm� Im <br />Figure 2.05,6 -1 Graph of Predicted Drawdown Resulting from Mine Dewatering <br />0 <br />PSCM Permit App. 2.05 -76 Revision 03/05/10 <br />D 500 1.000 1.500 <br />