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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> January 31, 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 0.002 (MW-20) 0.012 (MW-9) <br /> tert-butyl benzene 5 14 0.00063 0.0029 (MW-30) <br /> (2AMW-12) <br /> sec-butyl benzene 4 14 0.00061 0.013 (MW-18) <br /> (2AMW-12) <br /> Isopropyl benzene 5 14 0.00065 (MW-22) 0.068 (MW-18) <br /> p-isopropyl toluene 1 14 -- 0.0021 (MW-18) <br /> n-propyl benzene 3 14 0.0043 (MW-20) 0.068 (MW-18) <br /> 1,3,5-Trimethyl benzene 1 14 -- 0.00078 (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 /> SVOCs 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 Concentration in <br /> MRL Analyzed in mg/L (Well ID) mg/L (Well ID) <br /> 1-Methyl naphthalene 1 14 -- 0.020 (MW-9) <br /> Naphthalene 1 14 -- 0.027 (MW-28) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> -- = Not applicable <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.5 <br />