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P <br />undisturbed vegetation of adjoining land or the potential basal cover as de ned in the <br />Soil Conservation Service Range Site(s) for the area. <br />'diverse' will be accomplished if at least two (2) perennial genera and three (3) <br />perennial species, adapted to the area, make up the basal cover of the reclaimed area in <br />precipitation zones thirteen (13) inches or less and three (3) perennial genera and four <br />(4) perennial species in precipitation zones greater than thirteen (13) inches. One <br />species will not make up more than fifty (50) percent of the perennial vegetation by <br />basal cover. <br />'self-regenerating' and 'adapted to the area' will be evident if the plant community is in <br />good vigor, there is evidence of successful reproduction and the species are those <br />commonly used and accepted in the area. <br />- 'surface stability' will be accomplished if soil movement, as measured by deposits <br />around obstacles, depths of truncated areas, and height of pedestalling, is no greater <br />than three tenths (0.3) of an inch and if erosion channels (rills, gullies, etc.) are less <br />than one (1) inch in depth and at intervals greater than ten (10) feet. <br />If this standard is not met by the end of the second growing season, two alternatives exist <br />depending on the severity of the erosion: <br />a. If erosion is greater than two (2) times the allowable amount, correctional action <br />would have to be taken by the responsible company at that time. <br />b. If erosion is less than or equal to two (2) times the allowable amount, and it is <br />determined the erosion occurred during vegetative establishment and the site may <br />become stable, no correctional action would be required at that time. Another <br />check (and measurement) would be performed a year later to determine if stability <br />standards had been met. If the original measurements have not increased by more <br />than the allowed standard, the standard would be considered met. However, if the <br />increase is greater than the allowed standard, corrective action would be required. <br />-'subsurface stability' (mass wasting event) is of concern if disturbance has included <br />excavation over four (4) feet in depth and greater than 10,000 square feet in area on <br />slopes thirty five (35) percent and greater, or on any erosion-prone slope (Danforth <br />Hills, Vermillion Bluffs and badland areas). When these conditions occur, length of <br />liability for reclamation and final abandonment will continue for ten (10) years <br />following recontouring to original contour or for such time that climatic patterns <br />provide two (2) consecutive years in which measurable precipitation totals at least 120 <br />percent of average from October 1 through September 30, as measured by data <br />averaged from nearby regional weather stations. <br />This stipulation, or portions of it, may be waived by the AO. Such waiver will be documented <br />and justified when not applicable or objectives are accomplished through another method. <br />4