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Case Narrative <br /> Client: Norwest Corporation TestAmerica Job ID: 280-70820-1 <br /> Project/Site: Colorado Springs Transit <br /> ID: 280-70820-1 <br /> Lauoratory: TestAmerica Denver <br /> Narrative <br /> CASE NARRATIVE <br /> Client: Norwest Corporation <br /> Project: Colorado Springs Transit <br /> Report Number: 280-70820-1 <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 /> 'IPT <br /> amples were received on 06/16/2015;the samples arrived in good condition, properly preserved and on ice. The temperature of the <br /> coolers at receipt was 2.2 C. <br /> Please note:the Metals volume was received at a neutral pH.The laboratory preserved additionally. <br /> TOTAL METALS(Method 200.7/200.8) <br /> MS/MSD analyses were performed on sample LTC-1.The MS/MSD for method 200.7 Boron exhibited spike compound recoveries outside <br /> the QC limits.The acceptable LCS analysis data indicated that the analytical system was operating within control;therefore,corrective <br /> action is deemed unnecessary. <br /> No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. <br /> GENERAL CHEMISTRY-VARIOUS <br /> Sample LTC-1 (280-70820-1)[2X]required dilution prior to analysis for Hexavalent Chromium. The reporting limits have been adjusted <br /> accordingly. <br /> The Total Alkalinity sample duplicate analysis data associated with QC batch 280-283205 exhibited RPD data outside the QC limits. The <br /> acceptable LCS analysis data indicated that the analytical system was operating within control;therefore, corrective action is deemed <br /> unnecessary. <br /> No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. <br /> TestAmerica Denver <br /> Page 3 of 24 6/30/2015 <br />