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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 1, 2015 <br />Mr. John Hamrick <br />Cotter Corporation <br />P.O. Box 1750 <br />Canon City, CO 81215 <br />RE: Schwartzwalder Mine; DRMS File No. M- 1977 -300; Technical Revision (TR -22) <br />Dear Mr. Hamrick, <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision - 22 for <br />the above referenced operation on March 25, 2015. The decision date for this Technical Revision <br />is April 24, 2015. The Division has reviewed the Technical Revision Application and has the <br />following comments: <br />The proposed grouting plan calls for re- boring and grouting boreholes which were drilled in <br />the Sump 10 Area in 2012. The existing boreholes have been identified as the source of water <br />seeping into the Sump 10 Area. Please indicate if water was seeping into this area prior to <br />drilling the boreholes in 2012. If so, please specify the approximate amount of water which <br />was inflowing into the sump. <br />2. The proposed grouting plan calls for grouting 19 holes in the first phase of the project. The <br />Operator has stated that after 2 -3 days, an inspection of the Sump 10 Area will be made to <br />determine the effectiveness of Phase 1 and that based on the results up to 19 additional holes <br />may be drilled and grouted. Please specify the criteria which will be used to determine if <br />Phase 1 of the grouting program is effective. <br />3. The Operator has stated that adverse impacts to Monitor Well 18 are not expected as a result <br />of installing the grout curtain. Please identify Monitor Well 18 on Figure 1: Proposed <br />Grouting Area. <br />4. Please commit to providing the Division with a copy of the grouting as -built report within 30 <br />days after completion of the program. <br />of cO�o <br />Q <br />N O' <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: / /mining.state.co.us * *, <br />John W. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director \ * 187r. <br />