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June 25, 2010 <br />5of15 <br />t?f <br />' <br />401M, I <br />. <br />>. ` ? mpll <br />42 : I ow <br />U. M433 Mt g ''u <br />PoG26°0.07 FV V '?t µ <br />L:Q I e aahodan <br />U M' moll I' a ¢9 1 <br />RM } f ?,i <br />EM 405 wNi W T y 3 y?1 <br />Rr? 073 ?5,' 11 ?t? ? <br />EC: 3E0 wd+ovoom <br />f ? <br />4. '...,?, <br />MCI <br />U: 0.= moll <br />Ms -M a , <br />= a. <br />Rd26: 00'4Y& <br />EC 412 wY oLtm <br />3?C YY <br />EXPLANATION <br />Qi RwsroMa®c,uerawn,wnrer.owr.or.aw <br />acn?oar.rdnoaQ?o <br />06MXM.N" <br />09MAW UM <br />amnor-rawrr <br />GEOU 1. tEMMEUAMI <br />rr <br />r ? r r <br />wr rrrrrs.wr?.rrrroe?ww <br />Figure 2. Water Quality Survey Results Across Schwartz Trend, December 2009 <br />Pumping down the mine pool would result in increased oxidation and mobilization of contaminants within <br />the mine pool, reversing the current trend of declining uranium concentrations. <br />Uranium concentrations in the mine pool have been declining for the past seven years. As the mine <br />initially filled, concentrations rose rapidly and peaked at 60.2 mg/L in October 2002. Uranium <br />concentrations have shown a relatively steady decline to 36.2 mg/L in April 2010 (Figure 3). The <br />decreasing trend is expected to continue as the water in the mine pool returns to pre-mining unoxidized <br />conditions. Uranium is generally mobile in oxygenated environments and immobile in reducing <br />environments. Dewatering would create oxidizing conditions in the mine pool, and would mobilize <br />uranium that would otherwise remain stable and insoluble in the flooded mine. It has taken seven years to