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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 /> 2.6.2.3 Volatile Organic Compounds <br /> VOCs with concentrations at or above the MRLs are summarized below. <br /> Number of Number Minimum Detected Maximum <br /> Detections of D-ZoneDetected <br /> Constituents above the Wells Concentration/L (Well ID)in Concentration in <br /> MRL Analyzed mg mg/L (Well ID) <br /> n-butyl benzene 3 8 0.0014 (MW-70) 0.003 (MW-71) <br /> tert-butyl benzene 1 8 -- 0.00062 (MW-55) <br /> sec-butyl benzene 4 8 0.00095 (MW-70) 0.003 (MW-55) <br /> Iso-propyl benzene 4 8 0.0012 (MW-72) 0.014 (MW-71) <br /> n-propyl benzene 3 8 0.005 (MW-55) 0.034 (MW-71) <br /> 1,3,5-tri-methyl benzene 1 8 -- 0.00056 (MW-70) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> -- = Not applicable <br /> 2.6.2.4 Semi-volatile Organic Compounds <br /> There were no SVOCs with concentrations at or above the MRLs during 4Q10. <br /> 2.6.2.5 Dissolved Metals <br /> Analysis for dissolved metals is not required during the second and fourth quarter per MRP <br /> No. R5-2004-0820. <br /> 2.6.2.6 Quality Assurance/Quality Control Samples <br /> Duplicate sample QCDUP-6 was collected from L&M OU D-Zone well MW-68 during 4Q10 <br /> sampling event. A comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-68 QCDUP-6 <br /> TPH (mg/L <0.05 <0.05 0% <br /> TPHd (m /L) 0.45 0.38 +/- 16.9% <br /> TPHo (mg/L 0.094 0.052 +/- 57.5% <br /> Benzene (mg/L) 0.0005 <0.0005 NA <br /> MtBE (mg/L <0.0005 <0.0005 0% <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 2.16 <br />