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• Significant ground water inflow to the pits will be removed by pumping the water to those sediment <br />ponds that will, at the time of pumping, have a sufficient available storage capacity, including the <br />prescribed volume for the 10-year, 24-hour storm. Design criteria for the ponds is addressed in Tab <br />13 (Facilities), and includes plans for storage of additional volumes pumped from pits or sumps. <br />Maintenance of available storage capacity in the ponds involves dewatering and sediment removal. <br />Saround Water Monitoring. Since 1979, Peabody has progressively installed an extensive network <br />of 35 wells to monitor the shallow aquifers beneath the Nucla Mine mining area. Monitoring <br />instrumentation, parameters monitored, and monitoring frequencies are described in detail in Tab <br />15, Hydrologic Monitoring Program. The ground water monitoring plan employed to monitor the <br />extent and magnitude of any mining impacts is also discussed in detail in Tab 18, Hydrologic <br />Reclamation Plan. The ground water monitoring wells will be maintained for the life of the mining <br />operations or until such time as fhe CMLRD may agree that they are no longer necessary. All <br />ground water monitoring installations will be removed upon completion of the postmining hydrologic <br />monitoring phase of the Hydrologic Monitoring Program. <br />All ground water data collected from monitoring wells in each future water year will be compiled and <br />submitted to the CMLRD in the form of the Nucla Annual Hydrology Report (AHR). The AHRs will <br />be submitted within three months after the end of each water year. <br />• Surface Water Protection <br />Tab 13 (Facilities) contains descriptions, designs, and plans for sediment ponds, roads, diversions, <br />and culverts that have been or will be constructed and utilized at the Nucla Mine mining area during <br />mining. All facilities that are discussed in Tab 13 have been designed to ensure that the hydrologic <br />balance is protected. <br />The discussion for surface water protection has been separated into three parts: 1) surface water <br />quality; 2} surface water quantity; and 3) surface water monitoring. <br />S Urfa Wat -r Q ~ality. Seven sediment ponds will be used during the proposed operations for <br />controlling surface water runoff from disturbed and reclaimed areas. All ponds are temporary, as <br />none are intended to serve as permanent impoundments. The design of each pond has been <br />developed to prevent additional contributions of sediment to stream flow outside each permit area, <br />to minimize erosion, and incorporates detention times sufficient to ensure that all applicable effluent <br />standards will be met. Pond discharge structures are designed according to standard engineering <br />design procedures for protecting against erosion via emplacement of riprap and/or energy <br />dissipaters. Plans for any future modification of any sediment pond will be submitted to the CMLRD <br />for approval prior to construction. All ponds will be removed and reclaimed following the completion <br />• <br />16-3 <br />