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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 /> 2.3.2.3 Volatile Organic Compounds <br /> VOCs with concentrations at or above the MRLs are summarized below. <br /> Number of Number Minimum Maximum <br /> Detections of A-Zone Detected Detected <br /> Constituents above the Wells Concentration in Concentration in <br /> MRL Analyzed mg/L (Well ID) mg/L (Well ID) <br /> n-butyl benzene 3 14 0.00 16 (MW-20) 0.0087 (MW-9) <br /> tert-butyl benzene 5 14 0.00065 (MW-20) 0.0014 (MW-18) <br /> sec-butyl benzene 3 14 0.0026 (MW-20) 0.0099 (MW-18) <br /> Isopropyl benzene 3 14 0.0060 (MW-20) 0.049 (MW-18) <br /> p-isopropyl toluene 1 14 -- 0.0020 (MW-18) <br /> n-propyl benzene 3 14 0.0054 (MW-20) 0.046 (MW-18) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> -- = Not applicable <br /> 2.3.2.4 Semi-volatile Organic Compounds <br /> There were no SVOCs with concentrations at or above the MRLs during 3Q11. <br /> 2.3.2.5 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 A-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 13 14 0.011 (MW-21 & 0.24 (MW-9) <br /> MW-23 <br /> Nickel 3 14 0.0051 MW-31 0.0060 MW-34 <br /> Zinc 1 14 -- 0.029 (MW-21) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per Liter <br /> MRL = Method Reporting Limit <br /> -- = Not Applicable <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.5 <br />