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• <br />RULE 2 PERMITS <br />indicating an increasing trend in TDS concentration in the downstream direction. Average and individual <br />sample TDS values for all monitoring locations exceeded the USEPA secondary drinking water standard <br />for TDS of 500 mg/L. When present in detectable quantities, the total recoverable iron concentration in <br />individual samples fell well below the USEPA aquatic life standard of 1.0 mg/L. Manganese <br />concentrations fell below the secondary drinking water standard of 0.05 mg/L. The East Fork of Jubb <br />Creek was dry for all attempted sampling events. No water quality data was produced for sampling point <br />EFJC. <br />Springs and Seeps — Springs and seeps had variable water quality, with calcium- magnesium or calcium - <br />sodium anions, and bicarbonate - chloride - sulfate or chloride - sulfate- bicarbonate cations. Total dissolved <br />solids ranged from 700 mg /L to 1700 mg/L, always in excess of the 500 mg/L secondary drinking water <br />standard. One spring (V25) in Collom Gulch had elevated levels of both manganese and iron, both <br />exceeding the secondary drinking water standards. <br />Additional water quality data for these and other water monitoring locations may be found in the Annual <br />Hydrologic Reports submitted by Colowyo. <br />2.04.7 (3) Alternative Water Supply <br />Colowyo's proposed mining operations in the Collom permit expansion area are not expected to cause <br />significant contamination, diminution, or interruption of surface or ground water resources, based on <br />information provided in section 2.05.6. The potential diminution that may result during mining is within <br />the water rights held by Colowyo. Colowyo will utilize water from wells to serve as their alternative <br />water supply. <br />Data is included in Section 2.05.6(3)(a) Protection of Hydrologic Balance — Groundwater. <br />Collom — Rule 2, Page 47 <br />Revision Date: 8/5/11 <br />Revision No.: PR -03 <br />