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C TW6NTYM166 <br />aia COA6 COMPANY <br />A Cyprus Amax Company <br />iii-iiiiiiiuiiiiii <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />April 9, 1999 <br />Janet Binns RECEIVED <br />Environmental Protection Specialist <br />Division of Minerals and Geology APR 12 ,1999 <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 Division of Minerals & Geology <br />RE: Minor Revision 99-163, Additional Treatment System Information <br />Permit No. C-82-056 <br />Dear Ms. Binns: <br />The attached pages provide additional detail on the Fish Creek Borehole treatment system. Also, <br />the bond estimate for installing the temporary storage structures is enclosed for your review. Map <br />32 is enclosed and updated with the current baffle configuration and piping schematic. The <br />certification of the map is for the modified baffle layout, piping schematic and temporary <br />building location. <br />If there are further questions, please give me a call. <br />Sincerely, <br />Richard Mills <br />Environmental Manager <br />attachments <br />