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GEOLOGY r. -? 1313 Sherman St, Room 2t5~`' Denver,~Colorado 80203 Phone: 1303) 866-3567 FAX: (303) 832-8106 DATE: March 14, 2001 G TO: David Berry . I •_::',:;.'`..`.-":,,, •, J.iW~ ~.'~. ~l~%:' sill Owens ~. r:' FROM: Dan MatheWS Go"vemo~`i`Prc i?7~'r S Greg E. Walther. RE: Deserado Mine AHR Executive Direitoi;"''~ Permit C-81-018 Michael B. Lang Division Director I have completed a preliminary review of the 1999-2000 water year AHR for Deserado Mine, attached, and am requesting that you forward the document for PHC review by a hydrologist. I noted one apparent deficiency in my review (see attached letter to Scott Wanstedt). There are a couple changes in the report compared to last year, that I wanted to bring to the attention of the reviewing hydrologist I'm not sure if they are significant. First, Table 2-2 which compared bedrock well current year water levels to prior average water levels was not included in the report Uus year. Second, on page 8 under Ineoine Water, a paragraph which discussed seepage from geologic strata into the mine works in some detail was deleted from the report. The issue is addressed by a brief statement on page 6 which indicates that "B seam mining has encountered small flows, and the mine is essentially dry", On page I2 under Mining Related Hydrologic Impacts, water level impacts associated wiW specific monitoring wells detailed in previous reports, was tmm.ry~ri„vt by the statement that "water levels declined in closb~ proximity to mine workings, and holes mined Urrough typically tamed dry." The discussion regarding Alluvial.water Quality Data for the White River alluvium as affected by Kenney Reservoir is differeut.~ ~. than last year.(appears to better fit the data). The discussion indicates that the observed TDS fluctuations '~ were projected in the PHC, but I'm not sure that is the case. Let me know if you have any questions.