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-16- <br />D) The results of all monitoring will be submitted to the regulatory <br />authority within 30 days of data collection and analysis. <br />E) Due to the current temporary cessation of operations at the Munger <br />Canyon Mine, items A, B, and C, listed above are modified as follows. <br />Quarterly flow measurements shall be taken only at surface water <br />monitoring site SW-3 and ground water monitoring site GW-6. Water <br />quality samples shall be taken twice a year (once during spring <br />snowmelt and once during a storm event). Surface water samples must be <br />chemically analyzed for the parameters listed below. <br />pH Magnesium (Mg+2) <br />Specific Conductance Chloride (Cl-) <br />Temperature field) Carbonate (C03) <br />Bicarbonate HC03) Sulfate (SO4) <br />Calcium (Ca+2) Iron (Fe) <br />Ground water samples must be analyzed for pH, conductivity and static water <br />level. This modification is in effect only for such period of time that the <br />operation is under a division approved temporary cessation of operations and <br />no additional disturbances are created. <br />The operation is in compliance with the requirements of this section. <br />Sediment and Runoff Control <br />Information dealing with sediment and runoff control is presented in Sections <br />2.2.7, 2.3.1, 2.3.4, 2.3.5, of Volume I, Appendix M of Volume V, and Sections <br />2.3.5, 2.3.6, 2.3.7, 2.3.8 and Appendix As of Volume VI of the permit <br />application. This information has been reviewed by tfie Division for <br />compliance with the rules and Regulations and the resulting analysis is <br />presented below. <br />Mine Bench Sediment Pond <br />The proposed pond at the mine bench is designed to hold a volume of runoff and <br />sediment of .45 acre-feet. This capacity allows for the storage of runoff <br />resulting from the 10-year, 24-hour storm event (.24 acre-feet), as well as <br />storage of the sediment produced from the disturbance over a two-year period <br />(.21 acre-feet). The Division requires that a sediment clean out marker be <br />installed in the pond to indicate the level at which sufficient storage will <br />remain for both runoff and sediment generated by the 10-year, 24-hour storm <br />event. <br />The collector ditch into the pond will be stable under the flow from the <br />10-year, 24-hour storm event. The emergency spillway is designed to convey <br />flow from the 25-year, 24-hour event without eroding. The design of the pond <br />is presented in the amended application includes provisions for a dewatering <br />device to dewater the pond down to the maximum sediment storage level. <br />Refuse Pile Sediment Pond <br />