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Whirlwind Mine Groundwater Characterization Report <br /> Packrat Mine water chemistry is represented by several historical sampling events as shown in <br /> Appendix A. Sampling from the Packrat Mine was conducted by Umetco, BLM, and Peel <br /> Environmental in 2003. EFR sampled water from the pool in the mine in 2006 and 2007. No <br /> samples have been collected of Packrat Mine water since April 2007 as the mine has been in <br /> temporary cessation and the portal is inaccessible for safety precautions. Packrat Mine water is <br /> of sodium-carbonate type. <br /> Packrat Mine water has several constituents that exceed state water quality standards for <br /> groundwater including: pH, 2 of 6 values at 8.61 and 8.72 s.u.; arsenic, ranging from 0.592 to <br /> 1.26 mg/L; selenium, 3 of 4 values, ranging from 0.005 to 0.407 mg/L; uranium, ranging from <br /> 0.814 to 1.20 mg/L; vanadium, ranging from 0.76 to 2.6 mg/L; gross alpha, four results ranging <br /> from 215 to 1,050 pCi/L; radium-226, ranging from 10 to 32.3 pCi/L; and radium-226/radium- <br /> 228, ranging from <16.6 to 21.9 pCi/L. <br /> Arsenic exceeded the standard of 0.01 mg/L (domestic) and 0.1 mg/L (agriculture)with an <br /> average concentration of approximately 0.85 mg/L (6 samples). The selenium standard of <br /> 0.05 mg/L was exceeded in three of four sample results with an average concentration of <br /> 0.24 mg/L. The uranium standard of 0.030 mg/L was exceeded in six of six samples with and <br /> average concentration of 0.94 mg/L. <br /> Rajah 49 Mine (Thornton Portal) analytical results show a common ion chemistry that is similar <br /> to samples associated with the Brushy Basin Member, with the exception that this water has <br /> notably low concentrations of calcium and magnesium and an unusually high concentration of <br /> sodium. Nonetheless, the water is of sodium-bicarbonate type. Exceedance of state water <br /> quality standards occurs for all samples for the constituents of arsenic, selenium, uranium, <br /> gross alpha, and combined radium-226/radium-228. Samples collected at Rajah 49 Mine span <br /> from 1993 to 2021, with samples collected by EFR beginning in 2009. <br /> For the historical results (1993 to 2000), the arsenic domestic use standard of 0.05 mg/L was <br /> exceeded in all eight samples The selenium concentrations ranged from 0.002 to 0.2115 mg/L <br /> and exceeded the most-strict standard of 0.02 for agriculture use, in seven of eight samples. <br /> The uranium standard of 0.03 mg/L was exceeded in all eight samples ranging from <br /> concentrations of 0.99 to 5.18 mg/L. Gross alpha, with a standard of 15 pCi/L, was exceeded in <br /> all analyses conducted, with concentrations ranging from 203 to 2,156 pCi/L. Radium-226 <br /> Western Water& Land, Inc. 32 <br />