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General Shale <br /> Building The American Dream° <br /> e. Specify how the stormwater diversion ditch will be protected from erosion where <br /> the ditch turns from a north-south to an east-west direction. The Division <br /> recommends armoring the outside portion of the ditch in this section. <br /> The outer slope of the entire channel will be lined with riprap. Check dams will <br /> be installed along this curve to slow the stormwater down. As a backup to slow <br /> the stormwater down, a hydraulic jump will be installed at the end of the curve. <br /> Please refer to enclosed Final Stormwater Drainage Channel Design drawing C- <br /> 03 Plan and Profile,Drawing C-05 Ditch Details 1 and Drawing C-06 Ditch Details <br /> 2. <br /> f Specify how the terminus of the ditch will be armored to prevent erosion and <br /> potential head-cutting. <br /> The terminus of the stormwater ditch will be lined on all 3 sides with type H rip <br /> rap with underlying turf mat or geotextile fabric. Please refer to enclosed Final <br /> Stormwater Drainage Channel Design drawing C-03 Plan and Profile, Drawing <br /> C-05 Ditch Details 1 and Drawing C-06 Ditch Details 2. <br /> g. Specify how the natural drainage will be protected from scouring at the point where <br /> it receives the stormwater discharge. <br /> Energy dissipating blocks or large boulders will be placed on the opposite bank to <br /> protect against erosion. Please refer to enclosed Final Stormwater Drainage <br /> Channel Design drawing C-03 Plan and Profile and Drawing C-06 Ditch Details <br /> 2. <br /> h. Provide typical cross-section drawings of the stormwater diversion ditch for the <br /> upper, middle and lower sections. <br /> Please refer to enclosed Final Stormwater Drainage Channel Design drawing C- <br /> 03 Plan and Profile,Drawing C-05 Ditch Details 1 and Drawing C-06 Ditch Details <br /> 2. <br /> 2. The Operator has indicated the temporary stormwater diversion channel will be replaced <br /> with a permanent stormwater channel at the end of the life of the mine. The Operator <br /> should be aware the designs of the final stormwater diversion ditch must be submitted and <br /> approved through the appropriate revision prior to construction. In addition, the Division <br /> requests the Operator commit to not removing the temporary stormwater diversion ditch <br /> until such time as the permanent stormwater diversion ditch has been constructed or until <br /> other provisions for conveying stormwater have been approved by the Division. Please <br /> respond. <br /> General Shale will submit a technical revision for the final stormwater diversion ditch <br /> design and will wait for approval of the technical revision prior to construction. <br /> General Shale will commit to not removing the temporary stormwater diversion ditch <br /> until the permanent stormwater diversion ditch has been constructed or until other <br /> provisions for conveying stormwater have been approved by the Division. <br />