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TCI WHE <br />M-1980-244 TR101) <br />q Annual Fee/Report: CW <br />NEWMON T � Violations <br />MV 1995007 <br />AB <br />10/2511995 <br />MV1995050 <br />7i26,1 <br />AB <br />81211995 <br />MV 1995070 <br />10123I 1995 <br />AB <br />I Ol 17/1995 <br />MV2015005 <br />5/272015 <br />AB <br />2/812017 <br />MV2016035 <br />6122/2016 <br />RE <br />1/1812017 <br />Hand Delivered <br />10 April 2018 <br />Mr. Timothy Cazier, P.E. <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Alning Corporation <br />Fiddler's Green Circle, Suite 800 <br />Village, CO 80111 <br />2977 <br />M4 <br />ont com <br />EC 'Z' <br />APR 1 12018 <br />DIVISION OF FtEq <br />1WIIUING40 SVM <br />Re: Permit No. M-1980-244: Cripple Creek & Victor Gold Mining Company (CC&V): Cresson <br />Project: — VLF2 Liner Inspection TR#100 <br />Dear Mr. Cazier: <br />Newmont Cripple Creek and Victor Gold Mine (CC&V) hereby submits the following Technical <br />Revision (TR) 100 proposing to conduct a liner integrity investigation in the immediate area <br />impacted by the December 16, 2017 Squaw Gulch Valley Leach Facility (VLF2) slough. The <br />investigative plan, developed by a third party consultant, is presented in Attachment 1. <br />Background <br />On Saturday, December 16, 2017 a small internal portion of the VLF2 ore slope sloughed during <br />loading. Although this event posed no danger to human health, property or the environment, <br />through an abundance of caution, CC&V initiated an investigation to confirm VLF2 liner integrity. <br />During the February site -wide inspection, a Division of Reclamation, Mining and Safety (DRMS) <br />representative observed equipment removing ore from the slope in the area of the slough. <br />CC&V advised DRMS of the slide and the subsequent liner integrity investigation. On March 15, <br />2018, DRMS issued CC&V a Reason to Believe a Violation Exists letter and the February <br />inspection report. Within the inspection report, DRMS requested CC&V submit a TR on or <br />before March 29, 2018 outlining the process by which the VLF2 liner would be inspected and <br />recertified. A TR was submitted on March 28, 2018 detailing an inspection of the liner using <br />resistivity analysis. After submittal, it was determined that the resistivity analysis did not meet <br />Newmont's factor of safety requirements. An alternative inspection and recertification plan was <br />developed by NewFields and is outlined in Attachment 1. <br />VLF2 Liner Investigation <br />CC&V has contracted NewFields, a third -party engineering firm, to develop an inspection plan to <br />determine the integrity of the VLF2 liner (Attachment 1). This plan employs several steps as part <br />of a comprehensive approach toward determining what, if any, impact the December 16 slide <br />had on the drain cover fill (DCF) and underlying liner. The first step will consist of an inspection <br />of the High Volume Solution Collection pipes. The location of these pipes will be determined <br />using a utility survey. The present position of the pipes will then be compared to the as -built <br />survey. A change in pipe location may indicate a slide impact to the pipes and liner system. <br />The second step in the investigation will involve removal of ore from the DCF in the target area. <br />Ore will be removed to within two feet of the geomembrane surface. The extent of the area and <br />