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Case Narrative <br />The results included in this report have been reviewed for compliance with STL's Quality <br />Assurance/Quality Control (QA/QC) plan. The test results shown in this report meet all <br />requirements of NELAC and any exceptions are noted below. <br />This report may include data with reporting limits (RLs) less than STL's standard reporting limit. <br />These data and reporting limits are being used specifically to meet the needs of this project. <br />Note that, data are not customarily reported to these levels without qualifiers, because they are <br />inherently less reliable and potentially less defensible than the latest industry standards require. <br />Dilution factors and footnotes have been provided to assist in the interpretation of the results. <br />Each sample was analyzed to achieve the lowest possible reporting limit within the constraints <br />of the method. In some cases, due to interferences or analytes present at concentrations <br />above the linear calibration curve, samples were diluted. For diluted samples, the reporting <br />limits are adjusted relative to the dilution required. <br />STL utilizes USEPA approved methods in all analytical work. The samples presented in this <br />report were analyzed for the parameters listed on the analytical methods summary page in <br />accordance with the methods indicated. A summary of quality control parameters is provided <br />below. <br />This report shall not be reproduced except in full, without the written approval of the laboratory. <br />Quality Control Summary for Lot D7D190399 <br />Sample Receivina <br />STL Denver received four aqueous samples under chain of custody on April 19, 2007. <br />The cooler temperatures at receipt were acceptable at 5.7°C and 5.4°C. <br />Holding Times <br />All analysis was performed within the prescribed holding times. <br />Method SW846 82608. GC/MS Volatile Oraanic Analysis <br />The LCS/LCSD exhibited percent recoveries outside the QC limits, biased high, for non-target <br />compound carbon tetrachloride. Carbon tetrachloride is not a constituent of interest for this <br />project, and all other associated QC is 100% in control. Acceptable precision and accuracy <br />have been demonstrated; therefore, corrective action is deemed unnecessary. <br />Laboratory generated MS/MSD analysis data have been provided. The MS/MSD exhibited spike <br />compound recoveries outside the QC limits for multiple non-target compounds. Precision and <br />accuracy have been verified by the acceptable LCS/LCSD analysis data; therefore, corrective <br />action is deemed unnecessary. <br />No other anomalies were encountered. <br />Method 80158 (Gasoline Ranae Oraanicsl, GC Volatile Organic Analysis <br />The MS/MSD performed on sample CRMW06 were in control. <br />No anomalies were encountered. <br />• <br />STL Denver 2 <br />