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-2- <br /> Section 2 - Hydrology Review <br /> Due to the complexity and length of record of data available for the mine <br /> site, the Division requires a further reduction and analysis of water sampling <br /> data for the mine. The ultimate purpose is to provide a form where trends <br /> developed at the mine can be identified and used by the operator to accomplish <br /> a revision and updating of the Probable Hydrologic Consequences section of the <br /> permit application. Specifically, the Division requires the following data or <br /> reductions: <br /> 1 ) The mine discharge data should be plotted with TDS versus pumpage <br /> rates for each mine in order to allow for a depiction of TDS versus flow rate <br /> and develop a worst case loading on Coal Creek during a Q,7-10 low flow <br /> event. The data for the 1984 year to date should be graphed. This graphing <br /> should be continued in each annual hydrologic report. <br /> 2) For the surface water monitoring sites, graphs should be developed <br /> depicting flow, TSS, TDS, and iron as originally accomplished in the permit <br /> application, Volume 5, Appendix III-E-5. <br /> 3) The map depicting monitoring sites and NPDES pond effluent points <br /> should be updated to include the mine discharge points. <br /> 4) For ground water monitoring sites, graphs should be developed <br /> showing relationship of water level versus TDS, sulfate and, iron for the <br /> period of record. <br /> 5) The ground water quality tables as submitted February 14, 1986 <br /> should include water level along with chemistry. <br /> The hydrology section of the permit application requires updating to include a <br /> narrative describing a detailed Probable Hydrologic Consequences of mining at <br /> the Coal Basin Mines. A description of the following trends and possible <br /> impacts should address: <br /> 1 ) Localized effects in each tributary to Coal Creek <br /> 2) Effects on Coal Creek <br /> 3) Effects on Crystal River <br /> 4) Effects on alluvial bodies and their interplay with the surface <br /> regime <br /> The following conditions existing at the mine site should be described and <br /> their potential impact detailed: <br /> 1 ) Mine discharges <br /> 2) TSS off road system <br />