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Case Narrative <br />Client: Coors Energy Company <br />Project/Site: Keenesburg Mine, CO <br />Job ID: 280 - 26708 -1 (Continued) <br />TestAmerica Job ID: 280 - 26708 -1 <br />Laboratory: TestAmerica Denver (Continued) <br />SPECIFIC CONDUCTIVITY , <br />Samples FPW (280- 26708 -1), DH -96 (280- 26708 -2), DH -122 (280- 26708 -3), AMW -1 (280- 26708 -4), AMW -2 (280- 26708 -5), and SMW -2 <br />(280- 26708 -6) were analyzed for specific conductivity in accordance with SM20 2510B. The samples were analyzed on 03/26/2012. <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- 26708 -1), DH -96 (280- 26708 -2), DH -122 (280- 26708 -3), AMW -1 (280- 26708 -4), AMW -2 (280- 26708 -5), and SMW -2 <br />(280- 26708 -6) were analyzed for total dissolved solids in accordance with SM20 2540C. The samples were analyzed on 03/22/2012. <br />The following TDS sample of batch 112627 used a lower volume due to the nature of the sample matrix: AMW -1 (280- 26708 -4). Elevated <br />reporting limits (RLs) are provided. <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- 26708 -1), DH -96 (280- 26708 -2), DH -122 (280- 26708 -3), AMW -1 (280- 26708 -4), AMW -2 (280- 26708 -5), and SMW -2 <br />(280- 26708 -6) were analyzed for anions (28 days) in accordance with EPA Method 300.0. The samples were analyzed on 03/19/2012. <br />Samples FPW (280- 26708 -1) [5X], DH -96 (280- 26708 -2) [20X], DH -122 (280- 26708- 3)[5X] and [20X], AMW -1 (280- 26708 -4) [10X], AMW -2 <br />(280- 26708 -5) [10X] and [100X], and SMW -2 (280- 26708 -6) [20X] and [100X] required dilution prior to analysis. The reporting limits have <br />been adjusted accordingly. <br />No difficulties were encountered during the anions analyses. <br />All quality control parameters were within the acceptance limits. <br />HARDNESS <br />Samples FPW (280- 26708 -1), DH -96 (280- 26708 -2), DH -122 (280- 26708 -3), AMW -1 (280- 26708 -4), AMW -2 (280- 26708 -5), and SMW -2 <br />(280- 26708 -6) were analyzed for hardness in accordance with a calculated method. The samples were analyzed on 03/26/2012. <br />No difficulties were encountered during the Hardness analyses. <br />All quality control parameters were within the acceptance limits. <br />CORROSIVITY (PH) <br />Samples FPW (280- 26708 -1), DH -96 (280- 26708 -2), DH -122 (280- 26708 -3), AMW -1 (280- 26708 -4), AMW -2 (280- 26708 -5), and SMW -2 <br />(280- 26708 -6) were analyzed for corrosivity (pH) in accordance with SM20 4500 H+ B. The samples were analyzed on 03/17/2012. <br />No other difficulties were encountered during the pH analyses. <br />All other quality control parameters were within the acceptance limits <br />TestAmerica Denver <br />Page 5 of 31 3/27/2012 <br />