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S E C OR - M <br /> • Duplicate samples QCDUP-1, QCDUP-3 and QCDUP-4 were collected from L&M OU shallow <br /> zone wells MW-33, MW-21 and MW-4, respectively, during the first quarter 2008 sampling <br /> event. A comparison of the samples is shown below. <br /> Analyte Sample#' Sample# ° <br /> -�r <br /> MW-33 QCDUP-1 /° Difference <br /> TPH (mg/L <0.05 <0.05 0% <br /> TPHd (mg/L) <0.05 <0.05 0% <br /> TPHo (mg/L <0.05 <0.05 0% <br /> Benzene (mg/L <0.0005 <0.0005 0% <br /> MtBE (mg/L <0.0005 <0.0005 0% <br /> TBA m /L <0.005 <0.005 0% <br /> Analyte Sample # Sample# o <br /> yt I° Difference <br /> MW-21 QCDUP-3 - <br /> TPH (mg/L 0.095 0.086 9.94% <br /> TPHd (mg/L 1.7 1.6 6.06% <br /> TPHo (mg/L <0.05 <0.05 0% <br /> Benzene (mg/L <0.0005 <0.0005 0% <br /> MtBE (mg/L <0.0005 <0.0005 0% <br /> TBA (mg/L 0.024 0.026 8.00% <br /> Analyte Sample # Sample # <br /> MW-4 QCDUP-4 °I° Difference <br /> • TPH (mg/L 16 19 17.11% <br /> TPHd (mg/L <8.0 < 00.0 0% <br /> TPHo (mg/L <0.05 <0.05 0% <br /> Benzene (mg/L 0.023 0.03 26.4% <br /> MtBE (mg/L 0.0093 0.0099 6.25% <br /> TBA (mg/L <0.025 0.0076 N/A <br /> 4.3.3.6 General Laboratory Notes <br /> The following validation issues are consistent with the shallow zone quality assurance and <br /> quality control. Each set of issues corresponds directly with the denoted report (Appendix C). <br /> Validation issues with report number 60709• <br /> Values reported for p,m-xylene that are below the MRL should be considered estimates. Values <br /> for p,m-xylene are reported to the lower Client Required Detection Limit (CRDL) of 0.50 µg/L. <br /> Surrogate nitrobenzene-d5 was outside of quality control (QC) limits in samples MW-33 and <br /> MW-34. All other surrogates were with QC limits, including nitrobenzene in several other <br /> samples. No analytes were detected in both MW-33 and MW-34; thus, it is not anticipated to <br /> • affect the reported values. <br /> 1Q08QSSRQRSRQMR.Final.dcc 14 April 30,2008 <br /> 77Tw.26397.42.1307 <br />