2015-09-24_REVISION - C1982056 (3)

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TWENTYMILE COAL, LLC - FOIDEL CREEK MINE (C-82-056) MINOR REVISION MR15-289,10E EMERGENCY AIR BOREHOLE TECHNICAL ADEQUACY RESPONSES (09/16/15) 1) Revised page 2.04-9.1 is currently being revised with MR287. Given that the decision date for MR287 and MR289 is the same date and to avoid confusion; please revise this page to include the text from both revisions. Specifically, the section regarding the WCR Coal Coreholes currently does not match the text submitted with MR287. Please revise this page to include this information. Response: The referenced page has been reviewed and revised to incorporate the currently approved permit text, however, given that approval of MR287 will require completion of supplemental cultural resources work, approval may be delayed, so the revised page only references MR289. Copies of the revised pages are provided with these responses for replacement in the PAP. 2) Proposed revised page 2.05-45.28 indicates the Cultural Resource Survey for the proposed activity is located in Exhibit 6T. However, as this survey also included portions of the MR287 disturbed area, TC indicated with MR287 that this survey would be placed in Exhibit 6L. Please revise this page to indicate this survey will be placed in Exhibit 6L. Response: The referenced page and Table of Contents have been reviewed and revised to correct the exhibit reference. Copies of the revised pages are provided with these responses for replacement in the PAP. 3) Revised pages 2.05-45.28 and 2.05-84.13 indicate I foot of soil material will be salvaged from the borehole pad, and that a maximum of approximately 1,500 cubic yards of soil will be recovered. Exhibit 53-M6 and M7 maps indicate the borehole pad area is 1.2 acres. Given this, the Division estimates about 1,900 cubic yards of soil should be recovered. Please revise these pages to increase the estimated amount of soil to be recovered. Also, please revise Table 49A. Response: The referenced pages and table have been reviewed and revised to reflect the increased soil salvage volume. Copies of the revised pages and table are provided with these responses for replacement in the PAP. 4) Please depict the upgradient diversion ditch to be installed on the north and east side of the pad on the Exhibit 53-M6 and M7 maps submitted. Response: The referenced ditch will be at the toe of the fill slope, and will actually be on the North and west side of the pad. The corresponding text has been revised to reflect this correction, and the referenced maps have been updated to show the ditch location. Copies of the revised page and maps are provided with these responses for replacement in the PAP. 5) Enclosed is a copy of the reclamation cost estimate the Division conducted for this proposed project. Please acknowledge if TC concurs with the Division's estimate attached. Response: TC has reviewed and accepts the Division's bond reclamation cost calculations as a reasonable estimate of anticipated reclamation costs for the proposed borehole and associated surface disturbance.