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~DccAka-tMe: 14~~ Anvi,~~LQ I~~dr~ltx~~kc.(~o,'~- <br />III IIIIIIIIIIIII III Colorado Yampa Coal Company <br />COLORADO YAMPA 2951 S Routt County Road #27 <br />~ COAL COMPANY sss Oak Creek, Colorado 80467 <br />A Cyprus Amax Company (970) 879-3800 <br />April 3, 1997 RECEIVED <br />Ms. Ianet Binns APR 0 8 <br />Environmental Protection Specialist 1g98 <br />Colorado Division of Minerals and Geology <br />11313 Sherman Street, Room 2 ] 5 Division of Minerals & Geology <br />Denver, Colorado 80203 <br />RE: PERMIT C-84-062; 1997 ANNUAL HYDROLOGY REPORT <br />Dear Ms. Binns: <br />Please find enclosed duplicate copies of the 1997 annual Hydrology Report for Colorado <br />Yampa Coal Company's Mine No. 3. <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 OR,9CLE and to clean up discrepancies that <br />we have found in the data. The transfer of data to the new version ofOrac% 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 /> <br />