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L D <br /> Ago-awe <br /> Division f l eclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> 1 I S-ierr pan Street, Room 215 <br /> April 7, 2021 <br /> New Elk Coal Company, LLC. <br /> Attn: Randal Simpson <br /> 12250 State Highway 12 <br /> Weston, Colorado 81091 <br /> RE: Lorencito Canyon Mine, C-1996-084,Proposed Hydrology Monitoring Plan <br /> Dear Mr. Simpson, <br /> The Division of Reclamation, Mining, and Safety(Division)has reviewed the material that was submitted on <br /> March 22, 2021 as requested regarding the hydrological monitoring plan. The following question are in regards to <br /> that material. Please understand that this may not fully address all adequacy issues for any future amendments or <br /> permit revisions to the Lorencito Canyon permit. <br /> 1. There does not appear to be any identified downgradient monitoring locations for the P2 mining area. <br /> Please explain this or update the plan accordingly. <br /> 2. MW 4 does not appear to be down gradient of any of the proposed mining areas based on the currently <br /> approved potentiometric surface maps for the aquifer layers. Please explain this or update the plan <br /> accordingly. <br /> 3. Please update the potentiometric surface maps of the aquifer layers to be monitored, as it is difficult to <br /> determine the adequacy of the locations of groundwater monitoring wells without that information. <br /> 4. Please establish points of compliance wells in accordance with Rule 4.05.13. <br /> 5. From the monitoring map provided,the surface water monitoring plan does not seem to adequately <br /> monitor a number of drainages that will be undermined. Please update the plan to include monitoring <br /> locations for undermined drainages or rational as to why they are not deemed necessary. These appear to <br /> include Bonita Canyon, the un-identified drainage between P 1 and P2, Chimney Canyon, Little Pine <br /> Canyon, and Jeff Canyon. <br /> 6. Will any or all of these drainages be monitored for subsidence while being undermined? <br /> 7. Please identify a lab that will be doing the analysis and a method to get samples there. <br /> OF'Cal <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> Jared Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br /> y w <br /> 7` sNE N � <br /> 1876 <br />