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1~ III IIIIIIIIIIIII III cr~os BNB C06PONATION A Cyprus Amax Company P.O. Box 68 Craig. Colorado 81626 (970) 8248246 February 29, 1996 Ms. Erica S. Crosby Environmental Protection Specialist Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 °~^~iv~~ M~ ~ ~ ~yys Division ~! ~L+in~rais ~ ~c°ro9.v Re: DMG Permit C-81-044, Cyprus Empire Corporation (CEC) Response to Division Letter of January 3, 1996 Dear Ms. Crosby: This letter responds to the monitoring data requests as outlined in the Division's January 3, 1996 letter. CEC has reissued the 1994 Annual Hydrology Report (AHR) in which most of the issues raised in the letter are addressed. The enclosed reissued report includes revised text, and new figures, tables and appendice<~. The only items that are not reissued are the large format figures. We have included labels and an instruction sheet to change the figure numbers on these large format sheets. Response to Saecific Comments 1. The contour map of the Middle Sandstone Potentiometric Surface shows a westerly gradient while the text indicates a southerly gradient. The text has been changed to indicate the southwest to west: southwest gradient of the Middle Sandstone Potentiometric surface (Page 4). 2. The TDS value of 1474 mg/L for post-mining water quality does not appear to be in the PHC of the permit. The permit will be revised at the time of the mid-term review to reflect this new value. 3. Page 8 of the PHC (?) references alluvial well figures that are not included in the PHC (?). Figures 19 and 21 showing historic water levels and conductivity levels are included with this transmittal. In addition, the Williams Fork Alluviunn Potentiometric Surface map (new Figure No. 20) was included in the original submittal of the 1994 AHR. 4. The flow data for the No. 1 Strip Pit was not included in the report. The flow data for the No. 1 Strip Pit is presented in Appendix 4.