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Twentymile Coal, LLC. <br />Page 5 <br />August 11, 2016 <br />24. The flow rate and water quality of Trout Creek below Fish Creek can be affected by discharges at <br />site 109, 115 and proposed future discharges from the 6MN Reservoir. TC proposes to revise <br />page 2.05-155 to indicate that Site 109 has not discharged in some time; however this site has not <br />been decommissioned to the Division's knowledge and could potentially be utilized. Pages 2.05- <br />154 through 156 discusses detailed plan to adjust the flows at either site 109 and 115 in order to <br />meet the applicable Sulfate standard on Trout Creek. Based on a review of Exhibit 51 and the <br />passive water design, the sulfate level discharged from the 6MN Reservoir after treatment could <br />potentially have sulfate levels that could exceed the sulfate level discharged at Site 115. There is <br />no discussion about how TC will coordinate the discharge at sites 109 (potentially), 115 and the <br />6MN reservoir to comply with the sulfate standard. Please either explain how this will be done or <br />provide justification why it is not necessary. If no water supply uses are in place along lower <br />Trout Creek below the confluence of Fish Creek please verify this. <br />25. When the 6MN Reservoir is discharging please explain why increased monitoring along Trout <br />Creek is not necessary as it is when Site 115 and/or site 109 is discharging? <br />This concludes the Division's review of TR84. The Division is required to issue a proposed decision for <br />this revision by September 26, 2016. If you need additional time to address the adequacy review items, <br />please request an extension of the decision date. <br />If you have any questions feel free to contact me at (303) 866-3567, extension 8120. <br />Sincerely, <br />Jared Ebert <br />Environmental Protection Specialist <br />