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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 /> 2.6.2.3 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 in Concentration in <br /> MRL Analyzed mg/L (Well ID) mg/L (Well ID) <br /> n-butyl benzene 2 8 0.0015 (MW-70) 0.011 (MW-71) <br /> tert-butyl benzene 1 8 -- 0.00069 (MW-71) <br /> sec-butyl benzene 4 8 0.00078 (MW-55) 0.012 (MW-71) <br /> Iso-propyl benzene 4 8 0.0010 (MW-55) 0.059 (MW-71) <br /> n-propyl benzene 2 8 0.0091 (MW-70) 0.14 (MW-71) <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 in the eight D-Zone wells <br /> sampled during 3Q11. <br /> 2.6.2.5 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 D-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 8 8 0.020 MW-69 0.037 MW-55 <br /> Zinc 1 8 -- 0.011 (MW-74) <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 2.17 <br />