2010-06-28_REVISION - M1977300 (2)

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June 25, 2010 4 of 15 permeabilities are so low, the rock mass outside and above the mine was not affected very far from the mine. In fact, monitoring wells MW 10 and MW 11 on the hillside above the mine contain water because the rock is too tight to drain into the unsaturated workings directly below. On the ridge between the mine and Ralston Creek, water levels are expected to be higher than water levels in the mine pool, thus indicating a hydraulic divide between the mine and Ralston Creek along the Schwartz Trend. Water level elevations from two paired deep bedrock monitoring wells planned for installation in 2010 are expected to confirm the hydrogeologic conceptual model. Table 2. Results of Ralston Creek Water Quality Survey Across Schwartz Trend, December 2009 arameter / Units SampleID Date Time RC1- 091209 12/9/2009 14:50 RC2- 091209 12/9/2009 14:15 RC3- 091209 12/9/2009 15:15 RC4- 091210 12/10/2009 07:47 RC5- 091210 12/10/2009 10:15 RC6- 091210 12/10/2009 10:45 Molybdenum, diss. mg/L <0.1 U <0.1 U <0.1 U <0.1 U <0.1 U <0.1 U Uranium, dissolved mg/L 0.385 0.385 0.391 0.433 0.435 0.433 Uranium, suspended mg/L 0.0016 0.0019 0.0015 0.0017 0.0015 0.0014 Radium 226, dissolved pCi/L 0.82 0.73 0.26 0.67 0.37 0.36 Radium 226, pCi/L -0.05 U -0.006 U -0.07 U 0.04 U 0.06 U 0.05 U suspended Conductivity (Field) gmhos/cm 412 389 405 418 421 431 pH (Field) S.U. 7.20 7.24 7.14 7.47 8.03 7.97 Temperature (Field) °C 0.8 0.6 0.5 0.4 0.5 0.5