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RILL & GULLY MONITORING /STABILIZATION PLAN <br />• Re- grading or Stabilizing Rills and Gullies (Rule 414 6) <br />Reclaimed surface -mined lands in the permit area and final reclaimed lands associated <br />with the underground mine will be monitored following spring snowmelt and heavy <br />rains. If monitoring indicates the presence of excessive rills and gullies, closer <br />observation will be conducted to determine the cause. The areas where excessive rills <br />and gullies are found will be identified on a map. <br />Natural geomorphic processes in the reclaimed area will be emphasized, taking into <br />account the slope, aspect, and soil conditions of a site. Further consideration will be <br />given to the normal climatic patterns and rate of vegetation establishment and <br />development in the subject area. Evaluation will include whether the rill and gullies will <br />prohibit successful vegetation or will disrupt achievement of the post mining land use. <br />Based on this evaluation, several options will be available to correct the situation. These <br />options will be a direct result of studying the situation and selecting the option that will <br />best rectify the erosion problem. One or more of the following options and corrective <br />methods will be employed. <br />Improved Channel. If it is determined the topography of the graded area is such that <br />drainage is concentrated into a particular area, drainage will be improved. The drainage <br />bottom or channel will be reshaped if needed. This will be done with either a motor <br />• grader or dozer, making the channel V- shaped and approximately 16 to 20 feet wide. <br />The channel bottom will be seeded, covered with erosion matting and seeded, or rocked. <br />The method used will depend on site conditions. Continued observations will be made of <br />this area for additional problems or necessary maintenance. <br />No defined Channel. On a slope where there is no swale or defined channel, a number of <br />operations will be performed depending on the extent of the erosion. The area will be <br />disked on the contour or erosion matting will be placed in the area, depending again on <br />site characteristics. Reseeding will then take place. In addition to the above, contour <br />furrows in and above the erosion area may be constructed to intercept and slow down the <br />runoff or to control channel flows. Straw dikes will also be used where appropriate to <br />control runoff and promote vegetation. <br />Other Methods If corrective measure described under "No Defined Channel' fail, <br />further observation will be necessary to develop additional measures. A combination of <br />the first two described methods or some variation will then be applied. Methods may <br />include rock channels, contour furrows or laterals with rock or matting lined bottoms, <br />"V" ditches made with a dozer or motor grader, and methods described above to establish <br />vegetation. <br />Head Cutting Stabilization. Head cutting will be controlled using several varying <br />methods. If the area is at a point that concentrates runoff, the area will be improved to <br />accept the runoff. This would include reshaping the channel and channel bottom, <br />. seeding, and covering the channel with erosion matting or rock. In other areas, <br />PSCM Permit App. 2.05.4 -E2.1 4/16/10 <br />