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~_y iii iiiiiiiiiiiii iii 999 rFr-soor coat. ct>rr~Mr ,30o so~nn veb W~abm Dhlsbn Flegs,efl. Anzone 8600, (602) 77~-5253 'July 15, 1988 Mr. Carl Mount ~" ~ i~ r'-' " ~ `:~' Colorado Mined Land Reclamation Division `"'~e 1313 Sherman Street, Rm. 215 Denver, CO 80203 - .~UL ? c; 198 RE: Rill and Gully Monitoring - Seneca II Min~ECLAfvIA7f~rv UIVI~ION Dear Mr. Mount: During May 1988, Peabody personnel inspected reclaimed areas to identify excessive rills and gullies or locations that may potentially develop excessive rills and gullies. The results of this inspection are shown on the enclosed aerial photograph. The aerial photograph shows locations of rills and gullies we will continue to monitor (pink), those that will be revegetated (green), and those that will require additional protection (yellow). The three rill areas identified in pink are not yet nine inches in depth. These rills appear to have resulted from non-specific overland flow sources. They will continue to be observed to determine if detrimental development occurs. Six rill areas identified in green will require minor remedial prepatory work and revegetation. These areas have been generally a result of headcutting caused by overland flow, although one incident in the Wolf Creek area was a result of runoff being temporarily rerouted by a snowdrift. Some of the rills have been developing armour coating. The remedial plan for these areas is: Minor regrading, as appropriate, or channelization in severe portions of rills, minimizing disturbance to adjacent established vegetation; Install straw check dams anchored with steel posts along length of rill channelized; Disk areas not to be channelized; Replace removed topsoil as necessary; Complete remedial work in late summer prior to seeding; Seed disturbed areas with previously approved seed mix at approved rate; Two gullies identified in yellow will require additional protection. Gully A, in the Wolf Creek area, is a result of