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Page 2 <br />11/17/2015 <br />The potential for off-site material damage to the hydrologic balance as stated in Rule 2.04.6(1)(c) <br />was addressed. Drill logs were provided. Materials compositional data has adequately been <br />provided for acid forming potential and metals release. <br />Rule: 2.04.7(1)(3)-(5) — Hydrology Description <br />This is a review of the groundwater related sections of the Hydrology Description which include <br />groundwater information, alternative water supply information, and map preparation. <br />Foidel Creek mine is generally confined within the Twentymile Park groundwater basin, which <br />has historic mining impacts. The hydraulic gradient is generally toward the basin center and to <br />the the North East (Map 13). There are two regionally significant aquifers, the Twentymile <br />sandstone and the Trout Creek sandstone. The recharge zone is up gradient of the mine. The <br />wadge overburden and the wadge/wolf creek interburden are charaterized as discontinuous water <br />bearing zones of low quality with limited potential for stock ponds (pg 2.04-21). <br />Storage and recharge capacites are provided starting at page 2.04-25.1. <br />The Division has determined that there is no potential to impact the Trout Creek Sandstone which is the <br />significant aquifer that underlies the Wolf Creek Coal. The Trout Creek Sandstone is a confined aquifer <br />under potentiometric head. The confining shale layers above the Trout Creek Sandstone should prevent <br />any integration of water from the overlying Wolf Creek Coal seam. <br />Baseline characterization of the Wadge Coal/Wolf Creek Coal Interburden and the Wolf Creek Coal <br />Seam were established with the approval of TR -83 as well as the Wolf Creek Reserve monitoring plan in <br />Exhbit 14A <br />The development of the Wolf Creek Reserve has lowered the poteniometric surface <br />elevation in the Wadge overburden. Figure 06s Potentiometric Surface Wadge Coal <br />Overburden and Figure l I Wadge Overburden Potentiometric Surface and TDS <br />Concentrations are no longer representative of the current mine plan and should be <br />updated. (Rule 2.04.7(1) (a)(i)The depth below the surface and the horizontal extent of <br />the potentiometric surface of each aquifer above, within and, if potentially impacted, <br />below the lowest coal seam to be mined) <br />Rule: 2.04.7(1)(a)(iv) <br />Ownership, uses and location information for all existing wells, springs and other developed <br />ground water resources. <br />Wells within the permit boundary are referenced to be listed in revised Table 9 for <br />groundwater. Page 2.04-39 references an updated Table 9 from TR13-83 in 2014. Table <br />