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... III IIIIIIIIIIIIIIII STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman 4.. Room 715 Cenvcr, CO 80J0J Phone: 0031 866 156? FAX: (303183'_8106 March 19, 1993 TO: Janet Binns %~~ FM: Shawn Smith C~ Re: 1992 Annual Hydrology Review McClane and Munger Canyon Mines (C-80-004 and C-81-020) Dear Janet: pF Cpl tip,-p _R .r. .b 'r ~~~A O ~.v.mr . . ~ /876 ~ Roy Romer Governor Michael B. long Divieion Director I have reviewed the following documents for the AHR review for McClane and Munger Canyon: 1988 Annual Hydrology Report 1989 Annual Hydrology Report 1990 Annual Hydrology Report 1991 Annual Hydrology Report Midterm Review 4/91 and Response 6/91 Findings Document 1/92 Permit sections on Hydrology, geology, monitoring program Probable Hydrologic Consequences - Appendix N with maps Figures: 2.5-1 through 2.5-6 and 4.2-3. Background Both the McClane and Munger Mines have complied with their water monitoring program in monitoring frequency and parameters. The requirements for the mines are outlined in Rule 4.05.13 and Stipulation No.3 in the McClane permit. In brief, the water balance, mine consumption of water, location and amount of inflow have been noted in the 1992 AHR for the McClane Mine as Stipulation 3 dictates. The Munger site has remained inactive since 1984, therefore there is only one surface water site and no ground water sites monitored. Dry site conditions also account for the lack of monitoring systems at this site. Surface Water Monitorin4 All surface water sites, SW-1, SW-2, SW-3, SW-5 and SW-8 were monitored quarterly for the required parameters of a full suite analysis. Often these wells were dry for a quarter due to the intermittent and ephemeral nature of the McClane and Munger creeks. SW-1 and SW-8, both in the East Salt Creek (above and below the McClane Mine respectively) show data for all four quarters since this creek is perennial in nature.