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~ ~ iil iu~lllllllll III <br />Colorado Yampa Coal Company <br />COLORADO YAMPA 29515 Routt County Road #27 <br />~ COAL COMPANY Oak Creek, Colorado 80467 <br />A Cyprus Amax Company (970) 879-3800 <br />July 6, 1998 <br />P~CEIVED <br />Ms. Janet Binns <br />Environmental Protection Specialist ~~~. ~ ~ X998 <br />Colorado Division of Minerals and Geology <br />11313 Sherman Street, Room 215 Division c(Minerals & GeoWgy <br />Denver, Colorado 80203 <br />RE: PERMIT C-81-071; 1997 ANNUAL I-IYDROLOGY 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 I, 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 of OR,9CLE and to clean up discrepancies that <br />we have found in the data. The transfer of data to the new version of Orac% 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 />