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Case Narrative <br />Client: Coors Energy Company <br />Project/Site: Coors - Keenesburg Mine, CO 80643 <br />Job ID: 280 - 36986 -1 (Continued) <br />Laboratory: TestAmerica Denver (Continued) <br />No difficulties were encountered during the SAR analyses. <br />All quality control parameters were within the acceptance limits. <br />TestAmerica Job ID: 280 - 36986 -1 <br />ALKALINITY <br />Samples FPW (280- 36986 -1), AMW -1 (280- 36986 -2), DH -96 (280- 36986 -3), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and <br />AMW -2 (280- 36986 -6) were analyzed for Alkalinity in accordance with SM 2320B. The samples were analyzed on 12/15/2012, <br />12/20/2012 and 12/21/2012. <br />Alkalinity and Bicarbonate Alkalinity as CaCO3 were detected in the method blank associated with batch 280 - 152420. The <br />associated positive results in the analytical report have been flagged with a "B ". <br />No other difficulties were encountered during the alkalinity analyses. <br />All other quality control parameters were within the acceptance limits. <br />SPECIFIC CONDUCTIVITY <br />Samples FPW (280- 36986 -1), AMW -1 (280- 36986 -2), DH -96 (280- 36986 -3), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and <br />AMW -2 (280- 36986 -6) were analyzed for specific conductivity in accordance with SM 2510B. The samples were analyzed on <br />12/14/2012. <br />No difficulties were encountered during the conductivity analyses. <br />All quality control parameters were within the acceptance limits. <br />TOTAL DISSOLVED SOLIDS <br />Samples FPW (280- 36986 -1), AMW -1 (280- 36986 -2), DH -96 (280- 36986 -3), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and <br />AMW -2 (280- 36986 -6) were analyzed for total dissolved solids in accordance with SM 2540C. The samples were analyzed on <br />12/19/2012 and 12/20/2012. <br />Each sample is analyzed to achieve the lowest possible reporting limits within the constraints of the method. Due to the matrix, <br />samples AMW -1 (280- 36986 -2), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and AMW -2 (280- 36986 -6) required a dilution (using <br />a reduced aliquot size). The reporting limits (RLs) have been adjusted proportionately. <br />No difficulties were encountered during the TDS analyses. <br />All quality control parameters were within the acceptance limits. <br />ANIONS (28 DAYS) <br />Samples FPW (280- 36986 -1), AMW -1 (280- 36986 -2), DH -96 (280- 36986 -3), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and <br />AMW -2 (280- 36986 -6) were analyzed for anions (28 days) in accordance with EPA Method 300.0. The samples were analyzed on <br />12/18/2012. <br />Each sample is analyzed to achieve the lowest possible reporting limits within the constraints of the method. Samples FPW <br />(280- 36986 -1), AMW -1 (280- 36986 -2), DH -96 (280- 36986 -3), DH -122 (280- 36986 -4), SMW -2 (280- 36986 -5) and AMW -2 <br />(280- 36986 -6) required a dilution prior to analysis due to the nature of the sample matrix. The reporting limits have been adjusted <br />accordingly. <br />No difficulties were encountered during the anions analyses. <br />All quality control parameters were within the acceptance limits. <br />TestAmerica Denver <br />Page 4 of 34 1/11/2013 <br />