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6/7/2016 State.co.us Executive Branch Mail - Fwd: Twentymile Coal -Use of Flocculant to Settle Coal Fines Prior to Discharge to Fish Creek <br />AM <br />STATE OF Hernandez - DNR, Alysha <alysha.hernandez@state.co.us> <br />COLORADO <br />Fwd: Twentymile Coal - Use of Flocculant to Settle Coal Fines Prior to <br />Discharge to Fish Creek <br />1 message <br />Ebert - DNR, Jared <jared.ebert@state.co.us> Tue, Jun 7, 2016 at 9:01 AM <br />To: Alysha Hernandez - DNR <alysha.hemandez@state.co.us> <br />Cc: Daniel Hernandez - DNR <daniel.hernandez@state.co.us> <br />Hello Alysha, <br />Please scan this e-mail and the attachments into the file for the MR298 for the Foidel Creek Mine, C-1982-056. <br />From: Twentymile Coal, LLC. <br />TO: Colorado Parks and Wildlife <br />Doc. Name: Fish and Wildlife Consultation for use of Flocculent, MR297". <br />Thanks, <br />Forwarded message <br />From: Nettleton, Jerry <JNettleton@peabodyenergy.com> <br />Date: Tue, Jun 7, 2016 at 7:16 AM <br />Subject: Twentymile Coal - Use of Flocculant to Settle Coal Fines Prior to Discharge to Fish Creek <br />To: "bill.atkinson@state. co. us" <bill.atkinson@state. co.us> <br />Cc: "jared.ebert@state.co.us" <jared.ebert@state.co.us>, "Watterson, Brian" <br /><B Watterson@peabodyenergy. com> <br />C� <br />We have an existing water treatment facility on Fish Creek that has been used for years to treat mine water prior <br />to discharge in order to meet the effluent limits and requirements of our Colorado Discharge Permitting System <br />(CDPS) industrial discharge permit. Originally, this facility used sodium -hydroxide (caustic soda) to change the <br />pH of the mine water discharge, causing iron and other suspended solids to agglomerate and drop-out in a three <br />cell (in series) settling pond system prior to discharge. Sodium hydroxide is a strong alkaline material with <br />certain handling hazards, and the system was fairly expensive to operate, so in 2006 Twentymile converted our <br />treatment system to an electro -coagulation system, where the mine water is directed over a series of charged <br />electric plates causing suspended solids in the water to pick-up an electrical charge, adhere to other particles, <br />and drop-out in the settling pond system prior to discharge. <br />While this system remains in-place, we have not used it for a number of years because our extensive mine <br />water recycling system has allowed us to balance mine water use with mine inflow and recycling such that both <br />our water withdrawals and discharge have been minimal. We are moving into a new coal seam which is <br />underneath the previously mined seam. In order to safely develop and mine this lower seam, we need to drain <br />some of the water which has accumulated in the previously mined and sealed areas of the upper seam. This <br />additional water volume means that we need to discharge some of the water. <br />https://m ai l.google.com/mai I/u/0/?ui=2&i k=e29129fcb5&view=pt&search=i nbox&th=1552b61 cedl ae9f9&si m I=1552b61 cedl aeM 1/3 <br />