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COL ® RA ® <br /> 77 <br /> Division of Reclamation, <br /> Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> December 14, 2018 <br /> Jim Harrington <br /> Colorado Legacy Land, LLC <br /> 4601 DTC Boulevard, Suite 130 <br /> Denver, CO 80237 <br /> RE: Schwartzwalder Mine; DRMS File No. M-1977-300; Adequacy Review No. 1— <br /> Technical Revision No. 27 (TR-27) <br /> Dear Mr. Harrington, <br /> The Division of Reclamation, Mining and Safety(Division) received Technical Revision No. 27 (TR27) <br /> for the above referenced operation on November 27, 2018. The decision date for this Technical Revision <br /> is December 27, 2018. The Division has reviewed the Technical Revision Application and has the <br /> following comments: <br /> 1. The Operator is proposing to submit a single quarterly sampling report which provides the results of <br /> the quarterly sampling event. Please confirm the quarterly sampling report will continue to include <br /> the laboratory analytical results and the chain of custody forms. <br /> 2. The Operator did not include the sumps in the groundwater sample locations. Please provide a list of <br /> all sumps which are being sampled and confirm the proposed changes to the sampling methodology <br /> and reporting include the sump locations. <br /> 3. The Operator is proposing to relocate the submersible pump to a new location utilizing the Jeffrey air <br /> shaft. Please describe what steps will be taken to ensure the new pump and associated infrastructure <br /> are working properly before the current pump and infrastructure are taken off-line. <br /> 4. As noted above,the new submersible pump will be installed within the Jeffrey air shaft. The Operator <br /> removed an existing closure from the Jeffrey air shaft to gain access to the underground workings. <br /> Please confirm, that upon final closure of the site, the air shaft will be sealed in the manner approved <br /> under Technical Revision No. 8. If an alternate closure method will be utilized, then provide the <br /> Division with the design details of the proposed closure. <br /> 5. Please describe any changes in how water pumped from the mine pool will be conveyed to the water <br /> treatment plant, which result from relocating the submersible pump. In addition, provide design <br /> details for any changes to the existing infrastructure. The water treatment plant and associated <br /> infrastructure are designated as an Environmental Protection Facility, as such the Operator will be <br /> required to submit as-built drawings of the water treatment plant and associated infrastructure as <br /> required by Rule 7.3.2. The Division will require as-built drawings and construction certification to <br /> be submitted within 30 days of approval of the Technical Revision. <br /> ov C- <br /> � G <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. Hickenlooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director <br />