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Bu[ldoq Mine Tai[in,¢s Ponds Evaluation <br />• <br />4. The chemical chazacteristics of tailings pore water under current conditions was <br />measured. <br />5. The ability of the natural soils and sediments beneath the tailings impoundments to <br />attenuate metal constituents in tailings pore water was assessed. <br />6. The potential to impact ground water resources due to future precipitation on the <br />tailings and seepage from the tailings toward ground water was assessed. <br />• <br /> <br />In the tasks outlined above and in the results discussed in subsequent sections of this report, <br />tailings pore water is the term used for the fluid currently in the pore spaces of the tailings in the <br />Upper and Lower Tailings Ponds. Tailings seepage is the term used for the fluid that would <br />leave the tailings by displacement from precipitation and by gravity and migrate through natural <br />soils and sediments toward underlying ground water. <br />Tailings pore water and batch leach test extract were analyzed for a selected suite of parameters, <br />with measured concentrations compazed with applicable water quality standards for ground water <br />(discussed in Section 5.3). These standards aze based on human health and taste, and are <br />established by the Colorado Department of Health, Water Quality Control Commission. In this <br />report, drinking water standazds and ground water quality standazds refer to the values for <br />Colorado listed in Table 5.4 of this report. <br />Bomesmke Mining Company <br />ytll"-JlaibnlWugrpi <br />J <br />!rd ,tfiller, Inc. <br />Apnl I ~. 1997 <br />