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COLORADO <br />Department of Public <br />Health b Environment <br />Dedicated to protecting and improving the health and environment of the people of Colorado <br />Jerry Nettleton, Environmental Supervisor <br />Twentymile Coal LLC <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />jnettleton@peabodyenergy.com <br />MEMORANDUM <br />TO: Twentymile Coal, LLC - Foidel Creek Mine <br />FROM: Geneva Brion, Permit Writer 303-692-3532 <br />DATE: June 15, 2016 <br />RE: Approved Chemical Usage - CDPS Permit No: CO -0042161 <br />On June 14, 2016 the Water Quality Control Division (the division) received a chemical approval request from <br />Twentymile Coal for CDPS permit C00042161. The facility requests approval for the use of the flocculant <br />identified below at the Fish Creek Borehole and Water Treatment Installation (Foidel Creek Mine) to drop-out <br />coal fines and improve water quality of facility effluent prior to discharge via outfall 001A to Fish Creek. <br />Chemical Name <br />Purpose <br />Constituent of Concern <br />Amerfloc 490 Polymer <br />Coagulation and flocculation <br />pH <br />The flocculant will be metered into the flow stream prior to the existing EC mix tank. The treated flow will <br />be discharged from the mixing tank into the existing three -cell settling basin system. An application rate of <br />20 mg/l will be used, which will result in effective settling of coal fines with no anticipated flocculant <br />residual in the wastewater once the flows reach the third cell in the treatment system. <br />Based on a review of the Material Safety Data Sheet (MSDS) for Amerfloc 490 polymer, the division has <br />approved its use under this permit. The division has determined that the use of this chemical does not <br />require a modification to the monitoring requirements or discharge limitations provided in the permit at this <br />time. Note that all chemicals used in the treatment process that may be discharged to waters of the State <br />under this permit must be used in accordance with all state and federal regulations and in strict accordance <br />with the manufacturer's instructions. <br />4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe <br />John W. Hickenlooper, Governor I Larry Wolk, MD, MSPH, Executive Director and Chief Medical Officer ` • <br />