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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman S[., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 8663567 <br />FAX: (303) 832$106 <br />INTEROFFICE MEMORANDUM <br />TO: Dan Mathews {{~~ <br />FROM: Mike Boulay J~p <br />DATE: April 17, 2006 <br />COLORADO <br />DIVISION O F <br />MIN1cERALS <br />GEOLOGY <br />0.ECLANATION•NINING <br />SAFETT•SCIENCE <br />Bli) GWEYIS <br />Govenwr <br />Russell George <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />SUBJECT: McClane and Munger Canyon Mines (Permit Nos. C-1980-004 and C-1981-020) <br />2005 Annual Hydrology Report (AHR) Review <br />I have reviewed the 2004-2005 Water Yeaz AHR for McClane/Munger Mines. One report is <br />submitted for both mines since they are in close proximity, and it appears that the surface water <br />and groundwater monitoring programs are combined. <br />With regard to surface water, I generally agree with our Division's previous findings that mine <br />discharge will have a small impact on East Salt Creek. This is consistent with the Probable <br />Hydrologic Consequences discussion in the permit document and the data reported in the 2005 <br />AHR. Data presented in the 2005 AHR show that samples collected from East Salt Creek above <br />and below the mine site are generally the same for all parameters. I have the following minor <br />comments with regazd to the surface water data presentation. <br />On page 5 of the AHR, CDPS Discharge Monitoring Reports are mentioned (as indicated <br />in your preliminary review). It would be helpful to include a brief summary under pond <br />discharges (including outfall 002) of whether or not any CDPS effluent criteria were <br />exceeded during the water year. <br />2. Since mine water will enter East Salt Creek downstream from SW-1 following <br />installation of Culvert P, It would make sense to include sampling SW-1 during mine <br />discharge events rather than exclude it. <br />With regazd to groundwater, I recommend that the discussion in the AHR be expanded and the <br />permit document(s) may need to be clarified or supplemented with additional information. <br />The approved monitoring program for McClane includes wells GW-1 and GW-3. The <br />monitoring program for Munger includes wells GW-1, GW-3, and GW-6. The current approved <br />programs include quarterly monitoring for field parameters only (temperature, pH, specific <br />conductance, and static water level), Six alluvial wells were drilled and samples were collected <br />Office of Office of Colorado <br />Mined Land Reclamation Active and inactive Mines Geological Survey <br />