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If corrective measures described above fail, New Horizon proposes to observe and reevaluate the <br />situation. A combination of the first two methods described or some variation therein will be <br />applied. These activities can include, but are not limited to, rock channels, contour furrows or <br />laterals with rock or matting bottoms, V ditches made with the dozer or motor grader, and <br />subsequent revegetation. Head cutting in channels will be controlled by a number of methods. If <br />the area is at a point that concentrates runoff, the area will be improved to accept this runoff. <br />This would include reshaping the channel and channel bottom, covering with erosion matting, <br />seeding, or rocking. Inlet channel erosion will be controlled down to the average water level of <br />the ponds. Remedial action on pond slopes will extend as far down the slopes as equipment <br />access allows, which at a minimum will be below the level of the principal spillway of each <br />pond. In other areas, depending on the extent of erosion and time of year, the area will be <br />regraded, disked, and seeded as needed. Straw bales, erosion matting, or rock fill may also be <br />used to stabilize the area. <br />Should an area need repaired that requires a more long term control method, New Horizon may <br />employ additional measures including erosion control blankets, straw wattles, silt fences, silt <br />fence like products, small riprap structures, mulches, small check dams, small rock structures <br />including rock basket(s) to reduce runoff volume. If repairs are required, all areas that have been <br />mitigated will be seeded with an appropriate approved seed mixture. Prior to any erosional <br />mitigation work occurring, the surface landowner (unless it is New Horizon private property) <br />will be contacted for their approval of the proposed remediation measures. If any of the above <br />mentioned sediment control measures are employed, they will be used inside the primary <br />sediment control systems or in conjunction with small area exemptions (SAE). <br />All surface mining operations will be conducted to achieve the effluent limitations of 4.05.2(7) <br />for all mixed drainage when it leaves the permit area. Sedimentation ponds, diversion ditches, or <br />impoundments will be constructed before creating new disturbances, unless approved drainage <br />diversions or other surface water control structures are installed. <br />C. Collection Ditches, Culverts and Diversion Design Parameters <br />The main collection ditches in the original permit area are the 007 East and 007 West Ditch. <br />These have been renamed Ditches C 18 and C 17, respectively. These ditches are used to transport <br />runoff into Sedimentation Pond 007 for treatment in accordance with the requirements of <br />applicable regulations. The location and drainage area of these ditches can be found on Map <br />2.05.3(3)-1. The designs for culverts and ditches are presented in Attachment 2.05.3(3)-1. There <br />are no surface water control structures of any kind at the New Horizon #1 site. <br />All ditches were designed and constructed in accordance with the applicable regulations in <br />4.05.3. Diversions will be designed, constructed, and maintained in a manner which prevents <br />additional contributions of suspended solids to stream flow and to runoff outside the permit area, <br />Section 2.05.3(3) Page 2 April 2017 (MR -104) <br />