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Stantec <br /> L & M OPERABLE UNIT- THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 28, 2011 <br /> 2.3.2.6 Quality Assurance/Quality Control Samples <br /> TPHd, TPHo, TPHg, BTEX compounds, fuel oxygenates (MtBE, TAME, DIPE, EtBE, TBA), and <br /> VOCs were not detected at or above laboratory MRLs within Stantec's equipment blanks <br /> QCEB-1-RG, QCEB-1-PV, QCEB-2-RG, QCEB-2-PV, and QCEB-3-RG. <br /> Duplicate samples QCDUP-1, QCDUP-3 and QCDUP-7 were collected from L&M OU shallow <br /> zone wells MW-45, MW-23, and MW-31, respectively, during 3Q11 sampling event. A <br /> comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-45 QCDUP-1 <br /> TPHg (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 (m /L) <0.0005 <0.0005 0% <br /> MtBE (mg/L <0.0005 <0.0005 0% <br /> TBA (mg/L <0.005 <0.005 0% <br /> Analyte Sample # Sample # % Difference <br /> MW-23 QCDUP-3 <br /> TPHg (mg/L) <0.05 <0.05 0% <br /> TPHd (mg/L) 0.42 0.39 +/- 7.4% <br /> TPHo (mg/L) 0.089 0.084 +/- 5.8% <br /> Benzene (mg/L <0.0005 <0.0005 0% <br /> MtBE (mg/L <0.0005 <0.0005 0% <br /> TBA (mg/L <0.005 <0.005 0% <br /> AnalyteA L Sample #9 Sample # % Difference <br /> MW-31 QCDUP-7 <br /> TPHg (mg/L <0.05 <0.05 0% <br /> TPHd (mg/L) 0.052 0.053 +/- 1.9% <br /> TPHo (mg/L) <0.05 <0.05 0% <br /> Benzene m /L) <0.0005 <0.0005 0% <br /> MtBE (mg/L <0.0005 <0.0005 0% <br /> TBA (mg/L <0.005 <0.005 0% <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3Q11 QSSR QRSR QMR Stockton_FINAL.doc 2.6 <br />