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�COLORADO LEGACY LAND <br /> M-1977-300 APPLICATION AMENDMENT#5,COMMENT AND RESPONSE SU ry Y TABLE <br /> COMMENT NO. COMMENT <br /> No revisions have been made in response to this comment. <br /> Note: The Environmental Protection Plan (Whetstone Associates, <br /> 2016) is Attachment B of Technical Revision 23. <br /> Additional Itemfsl: Please see enclosed comment letters received CLL thanks the Division of Water Resources and History Colorado <br /> 17 from the Division of Water Resources on September 17,2020 and for their review and comments on AM-05. If human remains are <br /> from History Colorado on October 2,2020 encountered during reclamation activities CLL shall follow State <br /> law CRS 24-80 part 13. <br /> CLL thanks the Denver Water for their review and comments on <br /> Additional Itemfsl: Denver Water requests that CLL demonstrate AM-05. The proposed activities in AM-05 are consistent with the <br /> how the proposed AM-05 activities will be taken into consideration conceptual site model presented to DRMS and Denver Water in <br /> in the development of its conceptual site model(CSM)and requests October 2018. <br /> that CLL provide the following: 1) Underground mining in the Black Forest occurred at <br /> elevations equal to or above 6,604 ft amsl. Therefor the <br /> 1)The hydrogeologic data to demonstrate that the Black Forest Mine Black Forest Mine is a dry mine and does not have the <br /> will not contact groundwater or surface water and will not develop opportunity to contact surface water or groundwater at <br /> alternative pathways when the watertight bulkhead is installed. the Site. The original construction permit for the black <br /> forest mine cites an alluvial water level of 9 feet below <br /> 2)The design of the watertight bulkhead and the associated closure ground surface(6,595 ft amsl). Near by groundwater <br /> plan. wells in the shallow alluvium and deep bedrock indicate <br /> 18 depth to water in this area ranges from 15 to 120 ft bgs <br /> 3)The vertical gradient of groundwater in the vicinity of Ralston (6,489 to 6,484 ft amsl). Surface water and groundwater <br /> Creek and Black Forest Mine. data from 1998 to 2010 is presented and analyzed in the <br /> Schwartzwalder Environmental Protection Plan <br /> 4) Denver Water agrees with DRMS's adequacy review comment on (Whetstone Associates,2016). This document is <br /> Exhibit G and requests that CLL also provide the depth to Attachment B of Technical Revision#23. The text in <br /> groundwater and potential interactions between the fault fracture Exhibit G has been revised to include this information <br /> zones and Ralston Creek. and a discussion of the dry conditions in the Black Forest. <br /> 5) Evidence of an inward gradient of groundwater into the 2) The Black Forest Mine is currently closed with gates. <br /> Schwartzwalder mine and discussion of how that inward gradient Section EA of AM-05 includes a description of how the <br /> influence extends to the Black Forest Mine and whether it will it be adits shall be backfilled (voluntarily)for improved <br /> maintained. aesthetics. The inadvertent reference to a bulkhead <br /> closures for the Steve and Peirce adits was removed. <br /> PAGE 10 OF 12 <br />