2018-08-03_REVISION - C1980004 (4)

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WR COLORADO Division of Reclamation, Mining and Safety Department of Natural Resources 1313 Sherman Street, Room 215 Denver, CO 80203 John W. Hickenlooper Governor Robert W. Randali Executive Director Ginny Brannon Director INTEROFFICE MEMORANDUM TO: The File FROM: Clayton Wein 6616711 DATE: 6118'2018 SUBJECT: McCIane Canyon Mine, C-1980-004 Technical Revision No. 18 Memo to the File Technical Revision No. 18 (TR -18) for the McClane Canyon Mine (MCM) proposes the elimination and reclamation of the alluvial monitoring well GW -3 from the hydrologic monitoring program. Alluvial well GW -3 was incorporated into the monitoring program to report and analyze any hydrologic impacts to the alluvium of Munger Creek from mining related activity associated with MCM. Well GW -3 was initially required to be monitored quarterly for lab samples and field parameters required by the Rules. In 2011, during temporary cessation of the mine site, the monitoring program was reduced to monitoring in the second and fourth quarters every year. The same lab parameters and field parameters were required to be sampled. The 2017 Annual Hydrology Report was the only report in the last five years to use the reduced monitoring frequency for temporary cessation. The last five Annual Hydrology Reports were analyzed for the monitoring well GW -3. During the years 2013 through 2016, all sixteen quarters reported that the well was dry or was damp (not enough water to sample). In 2017, with the reduced monitoring frequency, both the second and fourth quarters reported the well was dry. Based on the Division's analysis of the past 5 AHRs, the monitoring well GW -3 is eligible to be released from the MCM hydrologic monitoring program and reclaimed. 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mfning.state.co.us John W. Hickenlooper, Govemor I Robert W. Randall, Executive Director I Virginia Brannon, Director L1y 1876