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• Subsequent cross-sections may then be compared to evaluate channel <br />dynamics. <br />The need to utilize either Method 2 or 3 depends upon field <br />conditions. When a single visual observation identifies an area where the <br />erosion process appears to be excessive and threatening the postmining land <br />use, these additional methods will be employed, either singly or in <br />combination. The results of such additional evaluation will be utilized in <br />determining if immediate corrective actions are required. <br />In those instances when a site contains both sheet and channel <br />erosion, it may be desirable to evaluate the entire site rather than <br />specific features. In this case, the Bureau of Land Management's Technical <br />Note #346, entitled "Erosion Condition Classification System", may be <br />utilized. Technical Note #396 is contained in Appendix 9.3-B. When this <br />method is employed to evaluate erosion conditions, land form stability will <br />be considered adequate as long as the "Factor Range" value is equal to or <br />less than 60. Sites whose "Factor Range" value is equal to or greater <br />than 61 will require remedial action to bring the site back into the <br />acceptable range of values (i.e., equal to or less than 60). <br />Evaluation of monitoring information will be performed annually and a <br />written report forwarded to the CDMG. The requirements for this report are <br />• discussed in greater detail in the final paragraph of 9.3.6.3. <br />4.3.6.3 Reactive Erosion Control <br />When unacceptable levels of erosion are identified through the <br />monitoring and inventory process, various corrective measures may be <br />implemented to correct the problem, including, but not limited to the <br />following: <br />1) Placement of rock or straw check dams or mulch imprinting <br />utilizing livestock and wildlife to stabilize small concentrated <br />flow areas (rills/gullies); <br />2) Gradient terraces may be constructed to shorten slope lengths and <br />convey concentrated flow around or through reclaimed areas; <br />3) Establishment of temporary or permanent vegetation by either <br />reseeding or interseeding temporary or permanent seed mixtures, or <br />the transplanting of containerized or bare root stock; <br />• <br />Renewal-3 9.3-21 June 13, 1997 <br />