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~~~~~~~® <br />June 25,2002 <br />~UN 2 e 202 <br />pivision of Minerals and Geolo9Y <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: PERMIT CO-0042161: Ammonia Compliance Plan <br />Dear Ms. Lenkey: <br />RIAIG <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />G~ ~ a ~z-os~ <br />~~--~ <br />The following letter is provided in fulfillment of the submittal of an ammonia compliance plan under the subject permit. <br />Background <br />A domestic waste water treatment facility at the subject site mixes with spoil water and eventually makes its way back into <br />subsurface mine water. This mixed water is used within the mine for dust suppression. A portion of the water is also taken up <br />in the produced coal, and the remainder drains to a sump that is pumped to a series of industrial ponds and finally discharged <br />in Fish Creek at the surface (Outfall 001). As a result of having come into contact with the domestic wastewater, future <br />limitations (July 2005) have been set for total ammonia at Outfall 001. Under the current permit, an ammonia compliance plan <br />is to be submitted to CDPHE by July 1, 2002. <br />Compliance <br />The Twentymile Coal Company is currently evaluating the design criteria for pipe/pump system, which would cycle water from <br />one portion of the subsurface mine to another, in lieu of discharging at Outfall 001. ey eliminating the discharge at the surface <br />through Outtall 001, the site would become a "non-discharging" facility, removing the need for future ammonia control <br />requirements (as suggested in the subject permit under Rationale -Page 7, subsection c). <br />Preliminary design and permit application requirements are being outlined. A first draft design plan is anticipated to be <br />available in August 2002. A copy of this plan will be forwarded to you. Assuming permit approval, and availability of <br />equipment, such a pump system could be in place by the Fall of 2002. Should any significant changes to the plan or other <br />issues arise, CDPHE will be notified in a timely fashion. <br />Please contact me directly at (970) 870-2750 for any questions. <br />Brian A. Watterson, <br />Environmental Geologist, <br />Twentymile Coal Company <br />cc: DMG <br />CWPS Permit No. CO-0027154 file <br />