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Meeting of November 26, 1996 Page 2 •A 100-year design for the culvert in Sylvester Gulch should be considered. •The stability analyses of the RPE should be done with both a clay liner and an I-IDPE liner, as it has not been determined which one will be utilized. •A simulation of how much coal waste and when it will be generated should be completed to determine how the cut in Phase I will be constructed and buttressed. Tun expressed a concern regarding the stability of the cut on the west side that will be 80 feet. In addition, the timing and amount of fill that will be generated from the RPE site preparation for the Sylvester Gulch construction should be evaluated and a range diagram prepared for this activity. •The clean water ditch that will be located immediately above the working area should be placed some distance (at least 20 feet) above the area. •The drainages that will receive water from the clean water diversions should be examined to ensure that excessive erosion of the drainage channel will not occur. •Tun recommended that the cuts should be benched. •Tun and Dave noted that the final configuration of the RPE includes a 500 feet slope length. Sediment control and erosion control during final reclamation should be addressed. •Tun expressed a concern regarding the stability of the area which has been designated as topsoiUsubsoil storage on the north side of the highway. •Given the rate of waste generation and the potential for selling the waste, Tim recommended that MCC consider reclaiming the pile during various stages (i.e. the pile never reaches Phase ~. •The underdrain sizing is acceptable, but MCC must present a logical plan and MCC must monitor the performance of the drain Tw stated the cumulative size of all underdrams has been accepted at other operations as meeting the rule specifications. •As the underdrain will be constructed in phases, MCC must control sediment load into the exposed portion of the underdrain. •MCC should address the location of the water table and whether or not the pile will cause it to rise into the pile. Also, it should be noted that the water table will be well below the Phase I grade. Sylvester Gulch PR Application Review •Dave said the application would be deemed complete as of Tuesday, November 26, 1996. •Dave said that four people on the staff would be reviewing the application and they are planning to send an adequacy letter by the end of December. •Dave talked with Mike Ward of the USFS and Larry Kline of OSM to alert them of the application. Ike Ward was awaze of the application as MCC had presented a copy of the application the previous week. Larry Kline detemuned that there would be no mine plan action by OSM, but they maybe involved in the review process. •MCC then went over the main facilities proposed to be constructed using a larger scale facilities map.