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Stantec <br /> L & M OPERABLE UNIT- THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 27, 2010 <br /> 2.5.2.4 Semi-volatile Organic Compounds <br /> There were no SVOCs with concentrations at or above the MRLs during the third quarter 2010. <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 0.0070 MW-61 0.031 MW-54 <br /> Chromium 1 8 -- 0.0088 (MW-63) <br /> Copper 1 8 -- 0.0054 MW-63 <br /> Zinc 3 8 0.010 MW-63 0.017 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 the third <br /> quarter 2010 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) 0.054 <0.05 NA <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 /> 2.5.2.7 General Laboratory Notes <br /> The laboratory validation issues are consistent with the C-Zone quality assurance and quality <br /> control. Each set of issues corresponds directly with the denoted report. All laboratory reports <br /> are included in Appendix C. <br /> IA-Fidewater7W Stockton(Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.14 <br />