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4~ <br />Lot #: D2L050322 <br />Case Narrative <br />Enclosed is tl~e report for two samples received at STL's Denver laboratory on November 15, 2002 and <br />two samples received on November 21, 2002. The results included in this report have been reviewed for <br />compliance with STL's Quality Assurance/Quality Control (QA/QC) plan. The test results shown in this <br />report meet all 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. These <br />data and reporting limits are being used specitically to meet the needs of this project. Note that data are <br />not customarily reported to these levels without qualifiers, because they are inherently less reliable and <br />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. Each <br />sample was analyzed to achieve the lowest possible reporting limit within the constraints of the method. <br />In some cases, due to interferences or analytes present at concentrations above the linear calibration <br />curve, samples were diluted. For diluted samples, the reporting limits are adjusted relative to the dilution <br />required. <br />STL utilizes USEPA approved methods in all analytical work. The samples presented in this report were <br />analyzed for the parameters listed on the analytical methods summary page in accordance with the <br />methods indicated. A summary of quality control parameters is provided below. <br />This report shall not Ue reproduced except in full, without the written approval of the laboratory. <br />Quality Control Summary for Lot D2L050322 <br />Sample Receiving <br />The samples were received at temperatures of 13.4°C and 16.2°C. The sample containers were <br />received in acceptable condition. <br />Dioxin and fiiran analysis was deternlined on a total basis (not on a SPLP leachate) and was <br />subcontracted to STL Sacramento located at 880 Riverside Parkway, West Sacramento, CA 95605 <br />(916) 373-5600. This analysis was logged in and will be reported under STL Denver lot number <br />D2L050322. <br />H1tGC/HRIVIS Dibenzodioxins and Dibenzofuran Analysis, Method SW-846 8290 <br />The internal standard recovery for 13C-1,2,3,7,8-PeCDD was above the method recommended <br />recovery goal of 135%. Quantitation by isotope dilution generally precludes any adverse effect on <br />data quality due to elevated internal standard recoveries. The analytes associated with these internal <br />standards are reported ND well below the lower calibration limit. There is no chance of a false <br />negative result and no corrective action is necessary <br />No other anomalies were observed. <br />2 <br />