2014-03-06_REVISION - C1982056 (2)

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Page 2 of 3 Rule 2.04.6(3)(a)(ii) A geologic map with geologic cross sections of the Wolf Creek Coal crop lines and the strike and dip f the Wolf Creek Coal. Rule 2.04.6(3)(a)(iii) A description including an appropriate map and cross sections prepared to the standards of 2.10 which shows the geology of the Wolf Creek Coal Seam including: (A) - The logs of drill holes, test borings or other samples showing the lithologic characteristics, physical properties and thickness of the interburden of the Wadge Coal Seam and the Wolf Creek Coal Seam and the Wolf Creek Coal Seam itself. (B) - The location of subsurface water not previously identified (C) - Chemical analysis of the Wolf Creek Coal Seam for acid - forming or toxic - forming materials. (D) - The chemical analysis of the stratum immediately above and below the Wolf Creek Seam for acid - forming. Toxic - forming or alkalinity- producing materials and their content. (E) The thickness and engineering properties of clays or clay shale, if any, in the stratum immediately above and below the Wolf Creek Coal Seam. 2. Per Rule 2.04.7(1)(a)(i), (ii), (iii), (v), and Rule 2.04.7(b) no discussion concerning the any aquifers related to the Wadge /Wolf Creek interburden, the Wolf Creek coal seam, or, if potentially impacted, strata directly below the Wolf Creek coal seam. The Division has studied the Williams Fork Formation here and at other nearby mines and has made findings in the past regarding the need for baseline groundwater information below the Wolf Creek Coal which is the lowest coal seam to be mined with this proposed mine plan area. The Division has determined that there is no potential to impact the Trout Creek Sandstone which is the significant aquifer that underlies the Wolf Creek Coal. The Trout Creek Sandstone is a confined aquifer under potentiometric head. The confining shale layers above the Trout Creek Sandstone should prevent any integration of water from the overlying Wolf Creek Coal seam. The Foidel Creek PAP also discusses the hydraulic isolation of the Trout Creek Sandstone. Additional baseline data collection will be necessary to identify potential groundwater impacts below the Wadge Coal Seam and within the Wolf Creek Coal seam. Characterization of the quantity and quality of water within each aquifer /saturated zone above and within the Wolf Creek Seam is required. Please provide a plan for review that addresses baseline characterization of the Wadge Coal/Wolf Creek Coal Interburden and the Wolf Creek Coal Seam. The plan, description, and associated maps should include both up gradient and down gradient monitoring wells and the Hydrologic Monitoring Plan and Probable Hydrologic Consequences portions of the permit document updated accordingly. 3. Well completion design plans for additional monitoring wells above and within the Wolf Creek Coal were not provided with this submittal. With respect to TR -83, the Division is requesting review of TC's proposed well completion design. Construction materials and techniques are important considerations for proper abandonment, and should be reviewed prior to approving an installation.