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Occurrence of excessive rills and gullies will result in implementation of the following <br /> plan. One of, or a combination of, the following options and corrective methods will be <br /> employed: <br /> If it is determined that the topography of the regraded area is such that drainage is <br /> concentrated in a particular area, then this area will be improved to accept the <br /> runoff. In areas where no natural armoring is present, the drainage bottom or <br /> channel will be reshaped, if needed. The channel bottom will either be seeded, <br /> covered with erosion matting and seeded, or rocked. The method used will, of course, <br /> depend on site conditions. Continued observations will be made of this area for <br /> problems or necessary maintenance. <br /> On slopes where no swale or defined channel exists, regrading, or disking, or chisel <br /> plowing will be performed, depending on the extent of the erosion. Reseeding will <br /> then take place. <br /> In addition to the above, contour furrows in and above the erosion area may be <br /> constructed to trap and slow down the runoff. Straw dikes can also be used where <br /> appropriate to control runoff and promote revegetation. <br /> If corrective measures described above fail, Peabody Coal Company proposes to observe and <br /> reevaluate the situation. A combination of the first two methods described or some <br /> variation therein will be applied. These activities can include, but are not limited to, <br /> rock channels, contour furrows or laterals with rock or matting bottoms, V ditches made <br /> with the dozer or motor grader, and subsequent revegetation. <br /> Head cutting in channels will be controlled by a number of methods. If the area is at a <br /> point that concentrates runoff, the area will be improved to accept this runoff. This <br /> 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 <br /> level of the ponds. Remedial action on pond slopes will extend as far down the slopes as <br /> equipment access allows, which at a minimum will be below the level of the principal <br /> spillway of each pond. <br /> 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 <br /> 13-6a Revised 09/26/90 <br />