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R� —ram <br /> CONSULTANTS. NC. MEMORANDUM <br /> Project 09120 <br /> TO: Greg Gulley-Denver Water <br /> FROM: Ed Friend, P.E., P.G. —RJH Consultants, Inc. <br /> DATE: June 12, 2014 <br /> RE: DRMS Coordination Meeting <br /> Lupton Lakes Project <br /> Introduction <br /> The purpose of this memorandum is to summarize items discussed during the June 6, 2014 <br /> meeting between the Division of Mining Reclamation and Safety (DRMS), Denver Water <br /> (DW), and RJH Consultants, Inc. (RJH). The purpose of the meeting was to discuss the <br /> potential of a soil-bentonite barrier wall replacing the compacted clay liner for the Lupton <br /> Lakes Reservoir Project (Project). The meeting was held at the DRMS office. This <br /> memorandum is a summary of the meeting and is not intended to be a verbatim account of <br /> what transpired at the meeting. <br /> Meeting attendees are provided below: <br /> Attendee I Organization <br /> Greg Gulley Denver Water <br /> Eric Scott DRMS <br /> Ed Friend RJH Consultants, Inc. <br /> Project Background <br /> RJH provided a brief background of the Project, the current mining progress, and informed <br /> the DRMS that the current mine dewatering is adversely impacting several wells on adjacent <br /> properties. The DRMS stated that they have not received any complaints and commended <br /> DW and the miner (Martin Marietta)for addressing the situation. The remainder of the <br /> mining and subsequent current planned construction of a compacted clay liner would require <br /> additional dewatering beyond the current mining operation, which is anticipated to adversely <br /> impact additional adjacent wells for a longer duration. A barrier wall concept was initially <br /> evaluated during earlier phases of the mining (prior to dewatering); however, it was not cost <br /> competitive with a compacted clay liner. However, reducing costs for mitigation of <br /> dewatering impacts could make the barrier wall cost competitive. <br /> Barrier Wall <br /> DW is considering an option to alleviate the adverse impacts to adjacent wells by installing a <br /> barrier wall around the perimeter of the reservoirs. This would allow dewatering to stop and <br /> the groundwater level to recharge to pre-mining conditions. Two concepts are being <br /> considered, a barrier wall constructed from the top of the mine slope (original ground) and <br /> from the mid-slope. The selected concept would depend on obtaining the required <br /> 09120_14-6-12 DRMS_Coordination Meeling_Memorandum <br />