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Environmental Protection Plan, Schwartzwalder Mine 14-4 <br />• <br />r. <br />• <br />250 <br />200 <br />i <br />Z 150 <br />O <br />2 <br />U <br />v 100 <br />N <br />50 <br />0- <br />Jan-98 <br />0.3 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 <br />? AWD (Upstream of Waste Rock Dump) • AN1 (Downstream of Waste Rock Dump) <br /> <br /> <br /> 5 <br /> E <br />9 <br /> yti __°p P'c I <br />J•nd6 J-99 Jan-0 -1 Jan42 J-.3 -U J•n45 J-06 Jan47 <br />-AWD (Upstream of Waste Rock Dump) --•- A001 (Downstream of Waste Rock Dump) <br />Figure 141. Comparison of TDS and Uranium Concentrations in Ralston Creek, Upstream <br />and Downstream of Waste Rock Dumps <br />035 <br />0.2 <br />SF <br />C <br />w 0.15 <br />0 <br />t <br />0.1 <br />0.05 <br />0 <br />(b) Geochemical Characterization of Mine Refill Water <br />Processes affecting water quality in the flooded mine were evaluated in a geochemical modeling study by <br />Whetstone Associates(2007). The study used the equilibrium-based geochemical modeling software <br />PHREEQCi 2.14.2 and a modified MINTEQ.v4 database that contained an expanded compilation of <br />thermodynamic data for uranium and molybdenum. <br />(i) Modeling Approach <br />Water entering the mine originates from two broad sources with variable water quality including: <br />1. Groundwater which enters the mine at a level equal to, or below, the mine pool; and, <br />2. Infiltration of meteoric water into the upper portions of the mine. <br />4109C.090807 Whetstone Associates