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TW6NTYM~6B IIIIIIIIIIIIIIIIIII <br />C COAT. COMPANY <br />A Cyprus Aman Company <br />Twentymile Coal Company <br />29515 Routt County Road M27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />May 7, 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 />RE: Technical Revision No, 99-32, PHC Modification <br />Dear Ms. Binns: <br />RECEIVED <br />MAY 10 1999 <br />Division of Minerab & Geology <br />Twenrymule Coal Company is requesting a technical revision to the above referenced permit to modify the <br />PHC section of the above referenced permit. The modification will address the Fish Creek Borehole <br />discharge and provide an update on projected pumping from the mine to dewater the Fish Creek Borehole <br />sump. Also, the modification provides future inllow~ and pumping estimates for the life of the mine. <br />The PHC section of the pernrit has been modified substantially, and this includes the addition of new <br />maps, figures and exhibits. Also, table 61 has been deleted due to the rewrite of the PHC section. Map 16 <br />is identified as a ne~v map, although initial permitting used it as a map number but it was deleted through <br />a prior revision. Tllis sounds confusing but I believe you understand what TCC is doing with <br />reintroducing Ille map number. A new• figure is added to show period of record water levels in well <br />BRDH-7. Finally, a new exhibit (49) is added to provide the support tables for the modified PHC. <br />1 believe the modified PHC prepared by Mr. ]im Nalven will address the issues discussed previously with <br />the Division. During the review process both Mr. Nalven and TCC representatives will be available to <br />meet with you to discuss any of the information presenlcd in this technical revision. <br />If [here are questions, please contact me at your convenience. <br />Sincerely', <br />~~x~,~~H~ro' ~~~t~ <br />Richard Mills <br />Environmental Manager <br />attachments <br />cc: Routt Counry• Clerk and Recorder <br />file: I:UevisionUech-rvUN932cl.doc <br />