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pQ_y III IIIIIIIIIIIIIIII PEABODY COAL COMPANY Western Dlvlslon 1300 South Vele Flagstaff, Arizona 66001 (602) 7745263 April 1, 1991 Mr. Dan Mathews Colorado Mined Land Reclamation Division 1313 Sherman Street, Room 215. Denver, Colorado 80203 RE: Permit C-28-057, Seneca II-W Mine, TR No. 11 Dear Mr. Mathews: ~~~~~ ~~~ APR 0 Roc/ Min ~a 31g9j d tali ~a~d Enclosed please find three copies of an application for a Technical Revision to the Seneca II-W permit. This submittal was prepared in response to the Division's March 14, 1991 decision to deny MR 15. Peabody proposes to increase the size of topsoil stockpile N and add 54.5 acres of associated disturbance to the existing permit area. Enclosed are three copies of the revised Operations Plan, Exhibit 12-I (3-5-91) and 5 Year Permit Area Disturbance Map, Exhibit 12-2 (3-5- 91) which show the increased size of topsoil stockpile N and the 54.5 acres of associated disturbance for advanced topsoil removal. The disturbance represents a minor alteration in the sequencing of the mine plan which will not cause a significant alteration in the reclamation plan. Figure TR. 11-1, Operations Plan, was prepazed and is enclosed to show the revised mine plan in the area of the proposed disturbance. The 54.5 acres of disturbance is within the permit boundary and life-of-mine disturbance area. A map (Exhibit 7-13B3) which accurately shows the Pond 006 watershed boundary and the proposed maximum disturbance area is enclosed. Pond 006-Phase I was reevaluated to demonstrate the pond has the required storage capacity to treat the runoff from a disturbance area of at least 335 acres (see enclosed Appendix 7-8B). The increase in maximum disturbance area from 277 acres (TR 10) to 335 acres in the watershed will ensure that mining activities can continue until Pond 006 is modified by Phase 2 construction. The as-built certification of Pond 006-Phase I (Exhibit 7-13B1) is enclosed.