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Doc Date:12/11/2001 III I II I II I II IIII III <br />999 <br /> <br />CI~ Section 816.106 Regrading or stabilizing rills and gullies. <br />When rills or gullies form in areas that have been regraded and topsoiled, the rills and gullies <br />shall be filled, graded, or otherwise stabilized and the area reseeded or replanted according to <br />Sections 816.111-816.117. The regulatory authority specifies that rills or gullies be <br />stabilized and the area reseeded or replanted if the rills or gullies are disruptive to the <br />approved postmining land use or may result in additional erosion and sedimentation. <br />Implementation of the mulching and soil stabilizing practices outlined under Section 780.18 <br />(a) will greatly reduce the potential for erosional problems. Specifically, the development of <br />gullies will be prevented through the use of surface contour furrowing to prevent overland <br />flow. Studies in the northern Great Plains reported by Dollhopf, et al. (1977) using similar <br />surface manipulation techniques demonstrate the effectiveness of contour furrowing in <br />minimizing gully formation and severe erosion damage. <br />• <br />If rills or gullies form that are disruptive to the approved postmining land use or which result in <br />excessive erosion or sedimentation, measures will be taken to identify and remediate any <br />causal agent(s) as necessary, and to then stabilize the arealsl effected. Since most reclaimed <br />areas have been revegetated, the intent of rill and gully repair measures is to provide <br />stabilization through means other than regrading. Stabilization and runoff control measures will <br />include the use of barriers, check dams, erosion stops, matting, and roughened surfaces to <br />control flow velocities, prevent further erosion, and promote sedimentation. These measures <br />can be implemented through the use and selective placement of various materials, including <br />riprap, straw bales, netting, matting, wood chips, mulch, or other appropriate materials to <br />effectively reduce overland flow. Once surface drainage control measures are implemented, <br />the associated affected areas will be remulched and given the opportunity to permanently <br />stabilize themselves through the growth of vegetation. If necessary, however, a small rubber- <br />tired tractor will be used to fill and regrade larger rills or gullies, minimizing surface disturbance <br />to the extent reasonably feasible. <br />I• <br />TR-19 <br />816-142 <br />Revised August 1999 <br />