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TW6NTYM166 <br />COw. COMPANY <br />A Cyprus Amax Company <br />iiiiiiiiiiiiiiiim~ <br />999 <br />^~CEIVEE` <br />,is.on of Min2t31S & Geology <br />March 25, 1999 <br />Janet Binns <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Twentymile Coal Company <br />29515 Routt County Road 1127 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />RE: Minor Revision 99-163, 3rd Right Gateroad Relocation, 2nd Right Sump In and Fish Creek <br />Borehole Treatment System Clarification <br />Permit No. C-82-056 <br />Dear Ms. Binns: <br />Twentymile Coal Company is requesting a revision to its pemtit to allow for relocating the 3`d <br />Right gateroad, Bumping in the 2"d Right gateroad and clarifying the treatment system at the Fish <br />Creek Borehole. Each of the activities are described below. <br />In regards to the relocation of the 3'd Right gateroad, it will be relocated approximately 200 feet <br />to the south as shown on Map 23. The gateroad is within the previously approved mine plan area, <br />therefore there is no new affected area associated with it. The same mining methods will be used <br />to develop this gateroad as are currently being used at TCC. <br />The 2°d Right sump-in will allow for some construction activity that will facilitate future mining. <br />The affected area associated with this is approximately 1.2 acres, and the general area is shown <br />on Map 23. Again, this is limited to development work; therefore there will be no surface <br />disturbance associated with this work. <br />The Fish Creek Borehole discussion has been modified to reflect the addition of the sodium <br />hydroxide treatment of the effluent, installation of baffles in the cells, installation of an inter cell <br />line and aerator, and the potential for adding sulfuric acid to the effluent prior to discharge. All of <br />these improvements were done to aid in the treatment of iron being discharged from the mine. As <br />you are aware the NPDES has an extremely low total recoverable iron standard, and these <br />improvements allow TCC to meet this standard. <br />In the interim, if there are questions please contact me at your convenience. <br />Ric ard 'I s <br />Environmental Manager <br />Attachment <br />File: I:\environmental\rev ision\m inor-rv\99163c1.doc <br />