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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 />2.4.2.3 Volatile Organic Compounds <br />VOCs with concentrations at or above the MRLs are summarized below. <br />2.4.2.4 Semi -volatile Organic Compounds <br />There were no SVOCs with concentrations at or above the MRLs in the 15 wells sampled during <br />the third quarter 2010. <br />2.4.2.5 Dissolved Metals <br />Dissolved metals with concentrations detected at or above the MRLs are summarized below. <br />Number of <br />Number <br />Minimum Detected <br />Maximum <br />Detections <br />of B -Zone <br />Concentration in <br />Detected <br />Constituents <br />above the <br />Wells <br />mg/L (Well ID) <br />Concentration in <br />MRL <br />Analyzed <br />m /L (Well ID) <br />mg/L (Well ID) <br />n -butyl benzene <br />1 <br />15 <br />-- <br />0.0012 (MW -58) <br />tert-butyl benzene <br />1 <br />15 <br />-- <br />0.0008 (MW -29) <br />sec -butyl benzene <br />1 <br />15 <br />-- <br />0.002 (MW -58) <br />Isopropyl benzene <br />1 <br />15 <br />-- <br />0.011 (MW -58) <br />n -propyl benzene <br />1 <br />15 <br />-- <br />0.0067 (MW -58) <br />Definitions: <br />MRL = Method Reporting Limit <br />ID = Identification <br />-- = Not Applicable <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 wells sampled during <br />the third quarter 2010. <br />2.4.2.5 Dissolved Metals <br />Dissolved metals with concentrations detected at or above the MRLs are summarized below. <br />lATidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3Q10\3Q10QSSRQRSRQMR Stockton_FINAL.doc 2.10 <br />Number of <br />Number <br />Minimum <br />Maximum <br />Detections <br />of B -Zone <br />Detected <br />Detected <br />Constituents <br />above the <br />Wells <br />Concentration in <br />Concentration in <br />MRL <br />Analyzed <br />m /L (Well ID) <br />m /L (Well ID <br />Arsenic <br />12 <br />15 <br />0.0081 MW -35 <br />0.086 MW -59 <br />Copper <br />1 <br />15 <br />-- <br />0.0053 MW -58 <br />Zinc <br />4 <br />15 <br />0.013 MW -16 <br />0.025 MW -58 <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit <br />-- = Not Applicable <br />lATidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3Q10\3Q10QSSRQRSRQMR Stockton_FINAL.doc 2.10 <br />