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Client: Coors Energy Company <br />Project/Site: Coors - Keenesburg Mine, CO 80643 <br />J_ b ID: 280 - 46536 -1 <br />Laboratory: TestAmerica Denver <br />Case Narrative <br />CASE NARRATIVE <br />Client: Coors Energy Company <br />Project: Keenesburg Mine, CO <br />Report Number: 280 - 46536 -1 <br />TestAmerica Job ID: 280 - 46536 -1 <br />- a <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 <br />control limits, with any exceptions noted below. Each sample was analyzed to achieve the lowest possible reporting limit within <br />the constraints of the method. In some cases, due to interference or analytes present at high concentrations, samples were <br />diluted. For diluted samples, 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 <br />in the individual sections below. <br />RECEIPT <br />Six water samples were received under chain of custody on September 12, 2013. The samples were received in good condition at <br />a temperature of 0.5 °C. <br />No anomalies were encountered during sample receipt. <br />DISSOLVED METALS (ICP) <br />No anomalies were observed. <br />GENERAL CHEMISTRY <br />Each sample is analyzed to achieve the lowest possible reporting limits within the constraints of the method. Due to elevated <br />concentrations, the following samples had to be analyzed at a dilution as indicated below. The reporting limits have been adjusted <br />relative to the dilutions required. <br />FPW (280- 46536 -1) was analyzed at a 1 O dilution for Sulfate <br />AMW -1 (280- 46536 -2) was analyzed at a 1 OX dilution for Sulfate <br />DH -96 (280- 46536 -3) was analyzed at a 20X dilution for Sulfate <br />DH -122 (280- 46536 -4) was analyzed at a 20X dilution for Sulfate <br />AMW -2 (280- 46536 -5) was analyzed at a 10X dilution for Chloride <br />AMW -2 (280- 46536 -5) was analyzed at a 20OX dilution for Sulfate <br />SMW -2 (280- 46536 -6) was analyzed at a 20X dilution for Chloride <br />SMW -2 (280- 46536 -6) was analyzed at a 20OX dilution for Sulfate <br />No other anomalies were observed. <br />REVISION 1 (10/23/2013) <br />This report has been revised to correctly report the Chloride result for sample AMW -1 (280- 46536 -2), as a 10X dilution factor was <br />incorrectly applied to this result in the original submission of this report. <br />Page 3 of 32 TestAmerica Denver <br />