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The layout of the ponds and /or ditches are presented on Maps 24, 25, 26 and 27, ( "D" Portal), Maps <br />• 103a and 114 (Loadout Area), Map 89 (East Portal), Map 77 and Map 77A (Refuse Disposal Area). <br />Pond details are presented on Maps 34, 35, 78, 79, 80 and 80A. <br />IV.J.3 Operation and Maintenance During the mine life, all sedimentation and drainage facilities <br />will be inspected regularly, cleaned and maintained as required. The ponds will be cleaned and the <br />sediment disposed of in the Refuse Area along with coal processing waste. The sediment level will <br />be checked quarterly during normal inspections. <br />An NPDES discharge permit was obtained for each of the sedimentation ponds, with monitoring of <br />the pond discharge proceeding in accordance with the appropriate permit. Copies of the NPDES <br />permit for the sedimentation ponds are contained in Illustration 13. If not already required by the <br />NPDES permit, suspended solids, total iron, total dissolved solids, pH, and flow rate have been <br />added to the list of parameters to be sampled to meet the requirements of OSM and DMG. The pH <br />of the water is greater than 6.0. However, if the pH falls below 6.0, a neutralizing process will be <br />installed, operated and maintained. Because of infrequent flows, the method used, if required, will <br />be manually operated unless otherwise directed. <br />Sedimentation and drainage control facilities for an area will be maintained and operated until the <br />area has been restored and revegetated and reclamation has been determined successful by the <br />appropriate agency. <br />• An exemption was requested from the requirement to maintain and operate Sediment Pond DP -1 <br />until final reclamation and revegetation has been determined successful. It is not possible to leave <br />this pond in place after reclamation of the Scullion Gulch diversion pipe since the pond was <br />constructed on top of the diversion pipe and will be destroyed when the diversion is removed. <br />Sediment control during reclamation of this area is discussed further in Section V.13.6. <br />The mine operator will monitor the natural drainage system over and in the immediate vicinity of the <br />underground mine. <br />Should subsidence occur which affects this natural drainage pattern, the operator will advise the <br />appropriate regulatory agencies who will decide whether or not the disturbance is significant enough <br />to require that a sedimentation and drainage control system be installed. In such a case, the <br />system will adhere to all regulatory requirements. <br />IV.J.4 Life of Mine Diversions Disturbance to natural drainage channels has been avoided <br />wherever possible. However, to provide enough level space without undue terrain disturbance, the <br />grading plan for the "D" Portal Area required rerouting of the main Scullion Gulch drainage channel <br />through a large diameter pipe culvert and of a tributary to Scullion Gulch northwest of the raw coal <br />• Technical Revision #68 (01/2011) IV -41 <br />