2015-11-27_REVISION - C1982056 (3)

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daily with the PRI1 submittal, and weekly for PRIO. For the railroad, TC did not sped where the monitoring points will be located on page 191.9 as is discussed on this page with the August 12, 2015 submittal for PRIO. Also for the railroad, TC indicated monitoring will be conducted daily with PRII and weekly with PRI 0. Please revise these pages as necessary for consistency. Response: The subsidence monitoring plan has been reviewed and revised to provide the additional requested information and address the noted inconsistencies in the monitoring schedule. Copies of the revised pages accompany these responses for replacement in the PAP. Section 2.06.8 — Alluvial Valley Floors 7. Revised page 2.06-25.7 references two reports in Exhibit 7e-2 and 7e-4. The Division believes TC meant to reference Exhibit 4e-2 and 4e-4. Please revise this page accordingly. Response: The referenced page has been reviewed and revised to address the noted error in the exhibit references. Copies of the revised page accompany these responses for replacement in the PAP. 8. Revised page 2.06-25.8 indicates that TC conducted a vegetation study on the Fish Creek AVF; this study is located in Exhibit 7J-1 of the permit. This page indicates that productivity between the AVF bottomlands and uplands are not significantly different. However, upon review of Exhibit 7J-1, the data indicates the production from the valley floor is about twice that of the upland area. Given this, the statement made on Page 2.06-25.8 does not appear to be correct. Please revise this page and evaluate if the conclusion drawn is still accurate. Response: The referenced page has been reviewed and revised to expand and clarify the comparison between the AVF and upland vegetation data and its relevance. Copies of the revised page accompany these responses for replacement in the PAP. 9. Revised Page 2.06-25.9 indicates that there are areas where sub -irrigation occurs within the AVF. Map 5 of Exhibit 4e depicts areas where sub -irrigation occurs along Fish Creek. Please evaluate the impact mining in the WCR will have on these areas that are sub -irrigated and to what degree mining may interrupt, discontinue or preclude agricultural activities on these areas. Response: The referenced page has been reviewed and revised to address potential subsidence -related impacts on sub -irrigated areas and the significance of any impacts relative to agricultural activities. Copies of the revised page accompany these responses for replacement in the PAP. 10. Revised Page 2.06-25.9 indicates that water quality is monitored at Station 900 on Foidel Creek downstream of previous mining in the Eastern Mining District and the proposed mining in the WCR. This station appears to be located within the 4RT longwall panel within the WCR, not downstream. Please revise this page to indicate this and please establish a new downstream monitoring point along Foidel Creek above the confluence of Middle Creek (See item below). Response: Potential subsidence -related impacts on Site 900 would not occur for a number of years. In the interim, this site will continue to be monitored. At least a year prior to potential mining impacts, this site will be moved to a downstream location and will be monitored during and following active mining in the area. The referenced page has been reviewed and revised to reflect relocation of this monitoring site. Copies of the revised page accompany these responses for replacement in the PAP. Exhibit 4E-11 Wolf Creek AVF Monitoring Program: 11. Please add alluvial monitoring well 001-S 5 as the upstream monitoring well for Foidel Creek. Response: Monitoring Well 001-S5 has been added, as an upstream monitoring well, to the Hydrologic Monitoring Plan and the related Plan and text have been revised to reflect this addition. Copies of the revised Hydrologic Monitoring Plan documentation accompany these responses for replacement in the PAP.