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• 4.14.4 Thin Overburden Colowyo does not have a thin overburden situation as explained in Section 4.14.1. 4.14.5 Thick Overburden Colowyo does not have a thick overburden situation as explained in Section 4.14.1. 4.14.6 Rearadina or Stabilizing Rills and Gullies The implementation of soil stabilizing practices outlined under Section 4.15.4 will lessen the possibility that erosion can become a serious problem. Colowyo plans to continue using surface manipu- lation techniques such as chisel plowing to reduce compaction, contour furrows and terraces to minimize overland flow over any long, uninterrupted slope. These methods have been shown to be highly successful in controlling erosion at Colowyo. Rills and gullies which form in areas that have been regraded and topsoiled and which either (1) disrupt the approved postmining land use or the reestablishment of the vegetative cover; or (2) cause or contribute to a violation of water quality standards for receiving streams will be filled, regraded or otherwise stabilized. If needed, topsoil will be replaced and the areas will be reseeded. To minimize disturbances to reclaimed areas by equipment, Colowyo will encourage stabilization through means other than regrading. If some regrading becomes necessary for stabilization, a small rubber tired farm tractor or track dozer will be allowed on the site to regrade the gullies. Generally, any rill and gully repair will take place when the soil conditions are suitable. As a rule these stabilization techniques usually take place at Colowyo in May or June when the topsoil has dried sufficiently to be worked. At Colowyo, rill and gully repairs have not been a problem. If rills and gullies do occur, they are routinely located, repaired, and, if necessary, reseeded in a timely manner every year. Colowyo will continue to implement this successful policy of rill and gully repair. 4.14-5