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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 /> 2.5.2.4 Semi-volatile Organic Compounds <br /> There were no SVOCs with concentrations at or above the MRLs in the eight C-Zone wells <br /> sampled during 3Q11. <br /> 2.5.2.5 Dissolved Metals <br /> Dissolved metals with concentrations detected at or above the MRLs are summarized below. <br /> Number of Number Minimum Maximum <br /> Detections of C-Zone Detected Detected <br /> Constituents above the Wells Concentration in Concentration in <br /> MRL Analyzed mg/L (Well ID) mg/L (Well ID) <br /> Arsenic 7 8 0.011 (MW-61) 0.026 (MW-64) <br /> Lead 1 8 -- 0.0061 (MW-62) <br /> Zinc 1 8 -- 0.061 MW-62 <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per Liter <br /> MRL = Method Reporting Limit <br /> -- = Not Applicable <br /> 2.5.2.6 Quality Assurance/Quality Control Samples <br /> Duplicate sample QCDUP-5 was collected from L&M OU C-Zone well MW-61 during 3Q11 <br /> sampling event. A comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-61 QCDUP-5 <br /> TPHg (mg/L) <0.05 <0.05 0% <br /> TPHd (mg/L) 0.32 0.28 +/- 13.3% <br /> TPHo (mg/L) 0.12 <0.05 NA <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 /> 2.5.2.7 General Laboratory Notes <br /> The laboratory validation issues are consistent with the C-Zone quality assurance and quality <br /> control. No issues were reported for the C-Zone in the reports. All laboratory reports are <br /> included in Appendix D. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.14 <br />