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i ~> <br />'I~IY6NTYMW6 <br />~ COAI. COMPANY <br />A Cyprua Amax Company <br />March 2, 1998 <br />III IIIIIIIIIIIIIIII <br />Twentymile Coal Company <br />29515 Routt County Road N27 <br />Oak Creek, Colorado 80467 <br />970-8793800 <br />RECEIVED <br />Janet Binns MAR p g ~ggg <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 2l5 Division of Minerals & Geology <br />Denver, Colorado 80203 <br />RE: PERMTfS C-84-062 and C-82-056; 1997 ANNUAL HYDROLOGIC <br />REPORTS. <br />Dear Ms. Binns: <br />As per our telephone conversation Friday, February 27 I am herein requesting an <br />extension of the due date for the above referenced reports. I would ask that the due date <br />for both reports be extended to Mazch 31, 1998. <br />As previously stated, the much friendlier utilities of this new version of Oracle <br />have allowed us to take a much closer look at our hydrologic database. It appears that in <br />the past, as efforts were made to update, correct, and overwrite old records, that many <br />new and often redundant records were inadvertently added to the database. <br />We have identified many duplicate records, found monitoring sites that have been <br />identified by multiple names, and found that analysis parameters have been reported under <br />multiple descriptions. <br />Since my last correspondence on this matter, we have completed transferring all <br />data into our new system. We have resolved the problems created by the multiple naming <br />of monitoring sites, and by the inconsistent description of analyses parameters. We have <br />also identified those records that had exact duplicates, and eliminated the redundant <br />information. We have, further, identified many more records that are, in fact, duplicate - <br />though not exact duplicates. These often differ by only a minute or two in the Sample <br />Instance Time, or by a difference of 1 in the Sequence Number (most of these differences <br />were an intentional attempt to manipulate the unwieldy behavior of the old software, while <br />some were undoubtedly typographical errors). <br />While exact duplicates could be compared and rectified globally, the non-exact <br />duplicates must be evaluated individually. Unfortunately, our database is very large and <br />there are many thousands of records yet to be evaluated. Obviously, the time <br />requirements for completing the cleanup of our data is not very compatible with the filing <br />requirements for Annual Hydrologic Reports on our mine permits. <br />