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~,3 Twentymile Coal Company An Affilliate of Cyprus Yampa Valley Coal Corporation March 2, 1994 Kent Gorham Environmental Protection Specialist Division of Minerals and Geology Office of Mined Land Reclamation 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE:2nd Half 1993 Subsidence Report Permit No. C-82-056 Dear Mr. Gorham: III Ilillllllllll III 29515 Routt County Road •27 Oak Creek. CO 80467 Phone (303)879-3800 REGErv~L~ MAR ~ 41994 ~i,.;~;~ .. Ci ~~-~~llv Three copies of the above referenced report were hand delivered to you on March 1, 1994 without a transmittal letter. This will serve as this letter and a copy should be attached to each of the reports. As you will note, the report has been expanded to cover the hydrologic and vegetation monitoring which was conducted in Fish Creek and its alluvial valley floor, along with the standard subsidence monitoring that has occurred at the mine. Please note that full suite water quality data for selected monitoring sites will be presented in TCC's annual hydrologic report to be submitted in the near future. In the event that we have further software problems and the AHR is delayed I will forward copies of the lab sheets for inclusion in the subsidence report. My preference is not to do this as it wastes paper and just adds to our respective files. As can be seen, wells GWB1, GWB2 and GWAP7 have shown impacts from mining and subsiding the area. Due to subsidence well GWB2 was replaced during December with well GWB2-R. Concurrent water level readings were taken for both GWB2 and GWB2-R to establish that the wells were responding appropriately. Well GWB2 will be grouted and abandoned after you have an opportunity to inspect it later in the spring. I would suggest we wait until June to abandon and grout the well as this will make access easier into the site. I look forward to receiving your comments on the report. Sincerely, Richard Mills Manager, Surface/Environment c~~us