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• 'lq~ <br />COLORADO YAMPA <br />COAL COMPANY <br />A Cyprus Amax Company <br />III IIIIIIIIIIIII III <br />July 6, 1998 <br />Ms. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />11313 Sherman S[reet, Room 215 <br />Denver. Colorado 80203 <br />Colorado Yampa Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />(970)879-3800 <br />RECEfVED <br />JUL 0 8 1998 <br />Division o1 Minerals 8 Georogy <br />RE: PERMIT C-81-071; 1997 ANNUAL HYDROLOGY REPORT <br />Dear Ms. Binns: <br />I am submitting, herein, duplicate copies of the 1997 annual Hydrology Report for <br />Colorado Yampa Coal Company's Mine 1, Mine 2 and Eckman Park Mine. These are <br />inactive surface coal mining operations. <br />As you are aware, for the past several months, we have been working to transfer our <br />• hydrology database into the latest version ofOR,9CLE 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 />