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e. Results of the O eratoes investigation <br />Analysis of the event shows that the precipitating factor was a faulty weld in a section of <br />the HDPE header. <br />The pipe on which the weld broke had been assembled in 2013 with no previous issues <br />reported. The pipeline was most recently moved in November 2016 to a lower elevation <br />where it was subjected to higher pressures (though still below the pressure rating of the <br />pipe). The added pressure is believed to have caused the weld to fail. <br />Since 2014 CC&V has provided HDPE pipe welding training by a certified welder to <br />personnel involved with pad operation, including annual refresher sessions. Whilst not a <br />statutory requirement, CC&V view this training as an important component to ensure <br />construction quality within its pipeline network. <br />In addition to the training outlined above, new headers are identified for QA/QC <br />purposes and following this event, CC&V practices have been modified to allow only the <br />use of new headers in higher pressure applications, restricting the movement and use of <br />existing headers to areas with lower expected service pressures. <br />Should you require further information please do not hesitate to contact me at 719.689.4055 or <br />Meg. Burt(a7newmont.com. <br />Sincerely, <br />A� <br />Meg Burt <br />Senior Environmental Manager <br />Cripple Creek and Victor Gold Mine <br />MBlcrm <br />ec: Tim Cazier — DRMS <br />Wally Erickson - DRMS <br />File <br />