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for the Nucla East mining area approximate the original premining contours. <br /> Topsoil material will exhibit infiltration rates generally similar to premining soils. At <br /> the Nucla Mine, established reclaimed areas have been disked and adequately reseeded, and <br /> future reclaimed areas in both mining areas will be manipulated mechanically using chisel <br /> plowing and ripping of graded and topsoiled areas in combination with timely reseeding to <br /> minimize overland flow rates and volumes. <br /> Surface Water Monitoring. Peabody has installed a network of surface water monitoring <br /> sites in irrigation laterals, at sediment structure discharge sites (NPDES), in <br /> tributaries to Tuttle and Calamity Draws, and in the main channels of Tuttle and Calamity <br /> Draws. Monitoring instrumentation, parameters, and monitoring frequencies are described <br /> in detail in Tab 15, Hydrologic Monitoring Program. The Surface Water Monitoring Plan <br /> employed to monitor the extent and magnitude of any mining impacts is discussed in Tab 18, <br /> Hydrologic Reclamation Plan. <br /> The surface water monitors will be maintained for the life of the mining operation or <br /> until such a time as CMLRD may agree that they are no longer necessary. All surface water <br /> monitoring installations will be removed upon completion of the postmining phase of the <br /> Hydrologic Monitoring Program. <br /> All surface water data collected at each monitoring site in each future water year will be <br /> compiled and submitted to the CMLRD in the form of the Nucla Annual Hydrology Report (AHR) <br /> within three months after the end of each water year. Future AHRs will include copies of <br /> quarterly NPDES discharge monitoring reports for each NPDES monitoring site submitted to <br /> the Colorado Department of Health during the same water year. <br /> Stream Buffer Zones <br /> The stream buffer zone along Calamity Draw (land within 100 feet of a perennial stream or <br /> stream with a biological community as defined by Section 4.05.18(3) of the CMLRD <br /> regulations) will be affected by associated disturbance activities within the Nucla East <br /> area (see Exhibit 12-3). The mining and operations plan for Nucla East has been developed <br /> so that there will be no disturbance to the main channel of Calamity Draw. Disturbance <br /> within the buffer zone will be limited and will consist of activities related to the <br /> construction of a drainage ditch (spreading excess excavated soil material) that will <br /> 16-7 Revised 08/19/88 <br />