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III IIIIIIIIIIIII III 999 MINED LAND RECLAMATION DIVISION Department of Natural Aesources 1313 Sherman Si., Roam 215 Denver, CO 80203 303 866-3567 Fnx: 303 832-8106 STATE OF COLORADO of ~a~ lF'~ ~F 90 NT" ~ O ~~ Y ~• ~/8~¢ Roy Romer, Gov¢mor Michael 8. Long, Division Director June 03, 1992 Gary W. Wendt Peabody Coal Company 1300 South Yale Flagstaff, Arizona 86001 RE: Seneca II-W Mine (C-82-057) Minor Revision 20 Stipulation 19 Response Dear Mr. Wendt: The Division has received your request for a minor revision to the Seneca II-W mining permit. The application is complete as submitted, and a decision regarding the application will be issued on or before June O8, 1992. Stipulation 19 to the approval of Technical Revision 16 states: "The operator shall submit to the Division a report describing findings of test pits in road cut azeas identified as possible stability problems, indicating whether projections from geologic mapping of the area were accurate. The operator shall also submit to the Division a slope stability monitoring plan for the road cut areas identified by the operator's consultant as possible stability problems. This plan should be approved by the Division and installed prior to construction of the road:' The Division has reviewed the geotechnical report submitted with the minor revision application, The report appeases Division concerns of recent slope failure in some areas of the proposed haul road. Some adequary concerns were identified in the Haul Road G slope stability survey monument installation plan. The monuments proposed are sufficient for that section of the road between stations 48+00' and 52+00', but the Division will •also require monuments through station 57+00'. The monuments should be installed as proposed, at an interval of approximately 150', with one monument located 25' from the crest of a cut or toe of a fill, perpendicular to the road, and an additional monument at a 50' distance from the crest or toe. At each location,