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pH Magnesium (Mg+2) Specific Conductance Chloride (CL-) Temperature(field) Carbonate Bicarbonate(HC03) Sulfate (S04) Calcium(Ca+2) Iron (Fe) THIS MODIFICATION IS IN EFFECT ONLY FOR SUCH PERIOD OF TIME THAT THE OPERATION IS UNDER A DIVISION APPROVED TEMPORARY CESSATION OF OPERATIONS AND NO ADDITIONAL DISTURBANCES ARE CREATED. The only aspects of the operation which could potentially impact the surface water in adjacent areas are the face up, mine bench and roads. A sedimentation system approved by the Division and in compliance with the regulations will route undisturbed flow around the disturbance and will conduct all flow from the disturbed area through a properly sized sedimentation pond. The water contained in the sedimentation pond will be released into the natural drainage only after it is determined that the discharged water will meet all applicable effluent standards. The pond design for the McClane Canyon Mine is adequate with respect to size and location. Additionally, Salt Creek Mining Company has installed a dewatering device in the pond. This dewatering device will ensure that the pond will at all times be capable of containing the 10 year-24 hour runoff event. Some ditches represented,in the mine plan indicated high, potentially erosive velocities when carrying the flow from the 10 year-24 hour event. These ditches are, for the most part, natural drainages that existed prior to mine development. The material in the ditches consists of large rocks and bedrock. These ditches are therefore considered to be non-erosive and stable. With satisfactory compliance with the stipulation, the operation will be in compliance with the requirements of this section. olo is Balance: Ground Water - Rules 2.04.5, 2.04.7 .6 3 and 4.05 Information provided by the applicant with respect to ground water in the permit area can be found in Sections 4.2.2 through 4.2.5 in Volume I of the application. Based on an analysis of these data the following determinations have been made by the Division. The occurrence of ground water within and adjacent to the McClane Canyon Mine permit area is controlled primarily by the combination of local topography, stratigraphy and geologic structure. Drilling has indicated that the Cameo coal seam becomes increasingly saturated downdip (northeast) from its outcrop along the side slopes of the East Salt Creek Drainage basin. This is depicted on Figure 4.2-3 of Volume II of the permit application. As can be seen on the figure, the saturated zone -10-