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• RECEIVED <br /> LOVELAND JUL 19 202Z <br /> READY-MIX a OF MCLM0100 <br /> July 7, 2022 � W <br /> CONCRETE <br /> PO BOX299 Mr. Brock Bowles <br /> LOVELAND,CO 80539 Colorado Division of Reclamation Mining and Safety <br /> 1001 E 62"d Avenue <br /> OFFICE 970.667.2680 Room 215 <br /> FAX 970.667.0092 Denver, CO 80216 <br /> RE: Knox Pit M2017-036 <br /> Technical Revision 1—TR-1 <br /> Dear Brock, <br /> Thank you for your review of TR-1 and your related comments dated July 1, 2022. <br /> TR-1 modifies Exhibits C and F to clarify the general backfill detail and how it will be <br /> constructed; specifically,the location of the drain and the liner keyed into the bedrock <br /> in relation to the compacted backfill for the pit liner. <br /> As documented in the Knox Pit Findings of Fact, Conclusions of Law, and Order <br /> approved by the Colorado Mined Land Reclamation Board and dated May 31", 2018, <br /> there are several mechanisms in place to ensure water quality is not impacted by <br /> keying the trench down into competent bedrock. <br /> 16. Applicant has installed monitoring wells and is currently monitoring the water <br /> quality. There will be a total of fourteen monitoring wells, thirteen onsite and one off- <br /> site. Four of the wells will monitor water quality. <br /> Loveland Ready-Mix Concrete(Applicant) has hired Telesto Solutions to monitor water <br /> quality in five of the fourteen monitoring wells. Quarterly water quality monitoring <br /> has taken place regularly for over three years, and we have established a solid baseline <br /> of groundwater quality data. Quarterly monitoring will continue as mining progresses. <br /> 17. Objectors raised concerns regarding possible leaching of selenium or other <br /> potentially harmful materials from the shale underlying the alluvium to be mined. The <br /> pits created through mining will have drain trenches dug into the underlying shale <br /> bedrock to channel water collecting in the pits to sum pumps. <br /> Loveland Ready-Mix Concrete has always and is still planning to dig drain trenches into <br /> the underlying,weathered,shale bedrock in order to channel groundwater in the pits <br /> to sump pumps. <br />