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6/16/2016 State.co.us Executive Branch Mail - Fwd: Twentymile Coal -Use of Flocculant to Settle Coal Fines Prior to Discharge to Fish Creek <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 Discharge to <br />Fish Creek <br />1 message <br />Ebert - DNR, Jared <jared.ebert@state.co.us> Thu, Jun 16, 2016 at 7:02 AM <br />To: Alysha Hernandez - DNR <alysha.hernandez@state.co.us> <br />---------- Forwarded message ---------- <br />From: Atkinson - DNR, Bill <bill.atkinson@state.co.us> <br />Date: Thu, Jun 16, 2016 at 12:16 AM <br />Subject: Re: Twentymile Coal - Use of Flocculant to Settle Coal Fines Prior to Discharge to Fish Creek <br />To: "Nettleton, Jerry" <JNettleton@peabodyenergy.com>, Sherman Hebein - DNR <sherman.hebein@state.co.us>, <br />Melynda May - DNR <melynda.may@state.co.us>, Pete Cadmus - DNR <pete.cadmus@state.co.us>, Justin Pollock - <br />DNR <justin.pollock@state.co.us>, Jim Haskins <jim.haskins@state.co.us>, Steve Znamenacek - DNR <br /><steve.znamenacek@state.co.us> <br />Cc: "jared.ebert@state.co.us" <iared.ebert@state.co.us>, "Watterson, Brian" <BWatterson@peabodyenergy.com> <br />Jerry, <br />Forgot the MSDS attachment... here it is. <br />Sorry, <br />Bill Atkinson <br />Aquatic Biologist <br />Colorado parks and Wildlife <br />925 Weiss Dr. <br />Steamboat Springs, CO 80487 <br />office: 970-871-2868; cell: 970-846-9381 <br />e-mail: bill.atkinson@state.co.us <br />On Wed, Jun 15, 2016 at 7:31 PM, Atkinson - DNR, Bill <bill.atkinson@state. co.us> wrote: <br />J erry, <br />First off, we (Colorado Parks and Wildlife) appreciate the consideration and opportunity to comment on this issue. Your <br />timing for us is less than ideal to review these processes, which I (we) are not very familiar with, given everybody's <br />workload and end -of -fiscal year obligations. This basin is one that we care about and we do appreciate your ongoing <br />efforts to keep us in the loop. <br />While the MSDS sheet you provided conveys 'little risk' to the aquatic environment, there are other MSDS sheets <br />(attached) which state that Amerifloc 490 posses potential risks to aquatic environments... "harmful to aquatic <br />organisms, may cause long term adverse effects in the aquatic environment". So, while we do have some concern, <br />we do feel that you will exercise proper measures to minimize any negative impacts to the aquatic environment. <br />Given that, and as you state, " the proposed feed rate of 20 mg/I will be consumed in the reaction with suspended <br />solids, with little or no residual in the discharge to the stream and that you are 'confident that you can meet your <br />permit effluent limits (which include WET testing) while using this treatment method', and that we are assuming that <br />any biological and/or chemical monitoring will catch any issues associated with this, we are ok with you moving <br />forward with this new treatment approach. <br />I invite any others to provide comments to Jerry regarding this issue. I am sending this e-mail as conditional approval, <br />but please understand that Sherm or Jim/Steve may insist that a signed letter is necessary. If so, they will work to <br />provide you said letter. <br />Thanks again for the opportunity to provide input, <br />hftps:Hmail.google.com/mail/u/O/?ui=2&i k=e29129fcb5&view= pt&search=i nbox&th= 1 55594dffe2d6c2d&sim 1= 155594dffe2d6c2d 1/4 <br />