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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 /> 2.4.2.3 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 B-Zone 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 1 15 -- 0.0025 (MW-58) <br /> tert-butyl benzene 2 15 0.00068 (MW-58) 0.0012 (MW-29) <br /> sec-butyl benzene 2 15 0.0010 (MW-59) 0.0046 (MW-58) <br /> Isopropyl benzene 3 15 0.0015 (MW-42) 0.026 (MW-58) <br /> p-isopropyl toluene 1 15 -- 0.00066 (MW-58) <br /> n-propyl benzene 3 15 0.0011 (MW-42) 0.016 (MW-58) <br /> 1,3,5-tri-methyl benzene 1 15 -- 0.00085 (MW-58) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> -- = Not applicable <br /> 2.4.2.4 Semi-volatile Organic Compounds <br /> There were no SVOCs with concentrations at or above the MRLs in the 15 B-Zone wells <br /> sampled during 3Q11. <br /> 2.4.2.5 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 B-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 15 0.0062 (MW-56) 0.066 (MW-58) <br /> Copper 1 15 -- 0.0059 MW-16 <br /> Zinc 2 15 0.012 MW-57 0.050 MW-24 <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\3Q11 QSSR QRSR QMR Stockton_FINAL.doc 2.10 <br />