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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> January 31, 2011 <br /> 2.3.2.5 Dissolved Metals <br /> Analysis for dissolved metals is not required during the second and fourth quarter per MRP <br /> No. R5-2004-0820. <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-RM, QCEB-2-RG, QCEB-2-RM, and QCEB-3-RG, except for a minor <br /> detection of toluene in QCEB-1-RM (0.00057 mg/L). <br /> Duplicate samples QCDUP-1, QCDUP-3 and QCDUP-7 were collected from L&M OU shallow <br /> zone wells MW-28, MW-21 and MW-20, respectively, during 4Q10 sampling event. A <br /> comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-28 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 (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 /> Analyte Sample # Sample # % Difference <br /> MW-21 QCDUP-3 <br /> TPHg (mg/L <0.05 <0.05 0% <br /> TPHd (mg/L) 0.95 1.0 +/- 5.1% <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) 0.0059 0.0068 +/- 14.2% <br /> Analyte Sample # Sample # % Difference <br /> MW-20 QCDUP-7 <br /> TPHg (mg/L) 0.49 0.5 +/- 2.0% <br /> TPHd (mg/L) 3.3 3.7 +/- 11.4% <br /> TPHo (mg/L <0.05 <0.05 0% <br /> Benzene (mg/L <0.0005 <0.0005 0% <br /> MtBE (mg/L 0.00053 0.00062 +/- 15.7% <br /> TBA (mg/L) <0.005 <0.005 0% <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4Q10-Annual\4Q10 and Annual QSSRQRSRQMR Stockton_FINAL.doc 2.6 <br />