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Case Narrative <br />Client: Coors Energy Company <br />Project/Site: Coors - Keenesburg Mine, CO 80643 <br />Job ID: 280 - 60014 -1 <br />Laboratory: TestAmerica Denver <br />TestAmerica Job ID: 280 - 60014 -1 <br />9 <br />Narrative <br />CASE NARRATIVE <br />Client: Coors Energy Company <br />Project: Coors - Keenesburg Mine, CO 80643 <br />Report Number: 280 - 60014 -1 <br />With the exceptions noted as flags or footnotes, standard analytical protocols were followed in the analysis of the samples and no <br />problems were encountered or anomalies observed. In addition all laboratory quality control samples were within established control <br />limits, with any exceptions noted below. Each sample was analyzed to achieve the lowest possible reporting limit within the constraints of <br />the method. In some cases, due to interference or analytes present at high concentrations, samples were diluted. For diluted samples, <br />the reporting limits are adjusted relative to the dilution required. <br />Calculations are performed before rounding to avoid round -off errors in calculated results <br />All holding times were met and proper preservation noted for the methods performed on these samples, unless otherwise detailed in the <br />individual sections below. <br />RECEIPT <br />The samples were received on 9/16/2014 1:13 PM; the samples arrived in good condition, properly preserved and, where required, on ice <br />The temperature of the cooler at receipt was 0.9° C. <br />A discrepancy was noted between the sample ID listed on the Chain of Custody and the sample ID listed on the sample container labels <br />for all samples. The sample container labels included a suffix of " -B ". The sample IDs were logged per the Chain of Custody. The client <br />was notified on September 17, 2014. <br />DISSOLVED METALS (ICP) <br />The MS /MSD associated with batch 280 - 243853 exhibited spike recoveries outside QC control limits for Calcium. The associated LCS <br />was in control and demonstrates that operating procedures were in control. No further action was required. <br />No additional analytical or quality issues were noted, other than those described above or in the Definitions /Glossary page. <br />SODIUM ABSORPTION RATIO <br />No analytical or quality issues were noted, other than those described above or in the Definitions /Glossary page. <br />GENERAL CHEMISTRY - VARIOUS METHODS <br />No analytical or quality issues were noted, other than those described above or in the Definitions /Glossary page. <br />TestAmerica Denver <br />Page 3 of 32 9/26/2014 <br />