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March 30, 2006 Mr. Byron Walker Re: Hayden Gulch Loadaut, Permit C-92-081 Responses to Mid[erm Permrt Comments Page 5 Existin buildings which will be demolished include • Conical stack tube • Stack tube reclaim tunnel (with feeder belt conveyor) • Crusher belt conveyor • Office/change house building The locations of these buildings, which are existing and currently on the ground (March 2006) are shown on Exhibit 12-1 (Revision 9, TR-04 Incidental Permit Boundary Change, dated 8/99) and Exhibit 12-2 (Revision 5, TR-04 Incidental Permit Boundary Change, dated 8/99). These exhibits are included in Attachment 12-1. TR-06 modifications will not significantly change the transportation network or the drainage and sediment control system. • The existing rail loop and spur will be retained in their existing configurations. Existing haul road HGLF-HRl will be retained in its existing configuration. These features are shown on Exhibit 12-1 (Revision 13). Please note these features are also shown in Attachment 12-1 on Exhibit 12-1 (Revision 9, dated 8/99). • The facilities area access road will be retained, but it will be shortened in length. The new, 30,000 ton coal stockpile will be placed over a portion of the existing road's path. The stockpile location and revised road corridor are shown on Exhibit 12-2 (Revision 10). The original road corridor is shown in Attachment 12-1 on Exhibit 12-2 (Revision 5, dated 8/99). • Haul road HGLF-HRZ is a proposed haul road that will be used by coal haulage trucks to get to the relocated coal loadout building. This proposed haul road corridor is shown on Exhibit 12-2 (Revision 10). Please note that there have been plans for haul road HGLF- HR2 since the initial permit application (December 14, 1992). The design was originally included in the PAP as Exhibit 12-5 (drawing date of 2/3/93). While the road was never constructed, the original design drawing (dated 2/3/93) has also been included in Attachment 12-1, since the proposed road layout is shown on Exhibit 12-1 (Revision 9, dated 8/99) and Exhibit 12-2 (Revision 5, dated 8/99). • The two sediment ponds (Truck Loop Pond and Rail Loop Pond) will be retained as is. There are no anticipated changes or modifications needed to either as a result of TR-06. The pond locations are shown on Exhibit 12-1 (Revision 13) and Exhibit 12-2 (Revision 10). As-built configurations are shown on Exhibit 12-3, Truck Loop Pondl Existing Condition (with a drawing date of 3/1/93) and Exhibit 12-4, Rail Loop Pond 2 Existing Condition (Revision 1, dated 4/05). Supporting documentation is presented in Appendix 12-1, Sediment Control and Pond Designs. Because there is no change from the existing configurations, there is no need to include any supporting documentation on the ponds in Attachment 12-1. • HGT[ anticipates that all the existing drainage ditches, with the exception of Ditch 5, will be retained with the new 2 MM ton/year coal handling system. Post TR-06 ditch configurations are shown on Exhibit 12-2 (Revision 10). All existing facilities area culverts will also remain following construction of the new coal handling system. Culvert locations Hydro-Environmental Solutions, Inc. P.O. Box 772996 57 10'h Street, Sui[e B Steamboat Springs, CO 80477 (970) 871-6125