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• TRIANGLE DITCH DESIGN <br />Program Storm, Version 6.21 <br />Solving for CFS & FPS <br />Configuration. Triangle <br />Flow Depth (ft) - - 1.00 <br />First Side slope. 1.00 <br />Second Side Slope .2.00 <br />Slope of Diversion. 0.02 <br />Manning's N 0.035 <br />CFS 4.99 <br />Cross Section Area (SQFT) 1.50 <br />Hydraulic Radius 0.41 <br />Velocity FPS 3.33 <br />Frounde Number 0.91 <br />• The runoff from SAE #1 is collected in a ditch which contains straw bales and grass vegetation to <br />filter out sediment. The ditch is also at a grade of approximately 2% which helps in the filtering <br />process. This has worked well over the past 8 years. Effluent quality is no different from any <br />undisturbed area in the vicinity. Once the topsoil stockpile is removed and the area meets post- <br />mine vegetation standards, the ditch can be reclaimed. <br />• <br />SAE #2 was located as apre-mine feature in the northern mineable portion of the Martin Property. <br />However, at the conclusion of reclamation backfilling for that portion of the Martin land, SAE #2 was <br />converted in a very small drainage basin with a completely incised sediment control pond. This <br />pond is named Pond 014. Therefore, SAE #2 no longer exists. <br />SAE's #3, #4 and #5 are located on the westernmost portion of the permit area where the terrain <br />is undulating and these areas cannot be made to drain to any sediment pond. The areas are 2.1 <br />acres (SAE #3), 2.6 acres (SAE #4) and 0.9 acres (SAE#5), respectively. The alternative sediment <br />control measures for these areas consist of earthen berms of 2H:1 V sideslopes with a minimum <br />top height of 3.0 feet installed at the bottom of the exemption area to channel the runoff into a 30' <br />REVISED MARCH 2006 <br />Attachment 2.05.3(3)-7-3 <br />