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The data that Cotter has been collecting indicates that water quality has been improving in the <br />creek. In fact, mass flow calculations of uraniwn in pounds per day measured at BPL showed <br />the lowest mass flow of uranium in the creek since late 2008, as shown in Figure 2. However, <br />the goal of 0.03 mg/L uranium in the creek has not been achieved. <br />6 <br />7 <br />6 <br />at <br />O <br />L <br />d <br />a <br />4 <br />V <br />n <br />c 3 <br />2 <br />1 <br />0 <br />Uranium at BPL <br />i <br />water Treatment Begins <br />(duly 2, 2010) a <br />i <br />919/08 12/16/08 3128/09 7/6/09 10/14/09 1/22/10 &VIO 8/10/)0 11/18/10 <br />Date <br />Figure 2 <br />Cotter conducted a site investigation on September 25, 2010 in response to stream water quality <br />data that suggested uranium was entering the creek above the discharge point for the water <br />treatment system. Several conditions suggest further remedial action. Those conditions are: <br />• The creek above sampling location BOS was dry. <br />• The creek immediately above the discharge location of the water treatment system was <br />not dry. <br />• Uranium levels in the water treatment system discharge have been consistently below <br />0.004 mg/L uranium. <br />• Water was observed entering the creek just upstream from BOS. The flow rate of this <br />water, which entered the creek from the bank on the mine side of the creek, appeared to <br />be on the order of approximately a few gpm. The water quality of this water is consistent <br />with groundwater measured at MW 9, which is immediately adjacent to the water entry <br />point. (See Figure 3.) The water is exiting the stream bank in a discrete, short length <br />along bank. <br />2