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;--.. ~ <br />~~~ ~t~iiir~~im iii <br />'~'W6NRYM166 <br />COAT, COMPANY <br />A Cyprus Amax Company <br />June 15, 1998 <br />Ms. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />11313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br /> <br />Twentymile Coal Company <br />29515 Routt County Road p27 <br />Oak Creek, Colorado 80467 <br />970-8793800 <br />RECEIVED <br />JUN 17 f998 <br />Division of Minerals ~ Geobpy <br />RE: PERMIT C-82-056; 1997 ANNUAL HYDROLOGY REPORT <br />Dear Ms. Binns: <br />I have forwarded, under separate cover, duplicate copies of the 1997 annual Hydrology <br />Report for Twentymile Coal Company's Foidel Creek Mine. <br />As you are aware, for the past several months, we have been working to transfer our <br />hydrology database into the latest version of ORACLE and to clean up discrepancies that <br />we have found in the data. The transfer of data to the new version of Oracle has been <br />completed, but the cleanup effort will continue into the future. <br />At the time that this report was compiled the following tasks had been completed: <br />For instances where a `location' had historically been identified under multiple <br />names, the data filed under each of those names had been consolidated into a <br />single file with one valid identification. <br />For instances where analysis `parameters' had historically been given multiple <br />descriptions, the data filed under each description for a specific parameter had <br />been consolidated into a single file with one valid description. <br />For instances where `exact' duplicate records were found, a single entry of each <br />data set was retained. <br />For instances where prior SAR values were, inadvertently, not overwritten in <br />1994 during an extensive effort to update and correct recorded values, only the <br />`corrected `values were retained. <br />These changes to the database have, of course ,affected the statistical calculations <br />throughout the report. Most of the changes are quite subtle however, because of the <br />volume of data included in those calculations. The most noticeable changes that you will <br />observe in this AHR when compared to previous years, will appear in the `counts' <br />