2012-04-25_REVISION - C1982056 - Laserfiche WebLink

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TWENTYMILE COAL, LLC - FOIDEL CREEK MINE (C -82 -056) MINOR REVISION MR12 -260 -16 -LEFT ROAD MODIFICATIONS TECHNIICAL ADEQUACY RESPONSES - 04/18/12 1. Proposed revised page 2.05- 45.22, paragraph 2, states that a total of nine culverts will be installed along the light -use road to pass natural drainage under the road The revised Exhibit 49Z Figure 1 only shows the location of eight culverts. Please revise the proposed text or the proposed Figure I to identify the correct number of culverts to be installed to address road drainage. Response: It is anticipated that at least eight culverts will be required (as shown on EX49Z -F1), and one additional culvert may be needed in the low area along the road just north of the facilities pad. If the additional culvert is required, TC will revise Figure EX49Z -F1, and submit as an "as- built" drawing, showing the location of the additional culvert. 2. It is noted that the two culverts south of the 17 -Left Pad and the culvert adjacent to the 16 -Left Pad are designed culverts. The Division currently approved designs identified in Exhibit 49Z as 16 Left Borehole East Culvert Design and 16 L Borehole. West Culvert. Please identify these designed culverts on Figure 1 of Exhibit 49Z, and acknowledge if the design criteria will remain unchanged with the proposed changes outlined in MR260. Response: The referenced culverts are already in- place, and are sized consistent with the original design information submitted as part of TR11-78. Figure EX49Z -F1 has been revised to include labeling for these culverts that is consistent with the corresponding text references. Copies of the revised figure accompany these responses for replacement in the PAP. 3. Approved Exhibit 49Z - Figure 2 identifies two drill pad topsoil stockpiles north west of the 16 Left Pad, with one on the east side of the Light -Use Road and one on the West side of the Light -Use Road. The proposed Exhibit 49Z - Figure 1, submitted with MR260 changes the location of these topsoil stockpiles to an area directly east of the 16 -Left Pad. Please revise Exhibit 49Z - Figure 2 to reflect the proposed changes identified in MR260. Response: Figure EX49Z -F2 has been revised for consistency with the updated Figure EX49Z -F L Copies of the revised figure accompany these responses for replacement in the PAP. 4. The Division has compiled the attached reclamation cost estimate for the tasks associated with the reclamation of the activities proposed under Minor Revision 260. This estimate is sufficient to reclaim all areas associated with the proposed activities under MR260. TCC submitted a reclamation cost estimate in the amount of $10,000.00. The Divisions total reclamation costs associated with these activities are estimated to be $8,991.90. Please acknowledge if TCC concurs with the Division's estimate or would like to use the TCC estimate provided Response: TC accepts the Division's bond reclamation cost estimate for MR12 -260, and will insert this estimate in Appendix A -1 as back -up documentation for the required incremental bonding. Please note that the recently approved Self -Bond Rider assures that the Division has sufficient bond to address the updated total bond liability.