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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 />2.3.3.4 Dissolved Metals <br />Dissolved metals with concentrations detected at or above the MRLs are summarized below. <br />2.3.3.5 Quality Assurance/Quality Control Samples <br />TPHd, TPHo, TPHg, BTEX compounds, fuel oxygenates (MtBE, TAME, DIPE, EtBE, TBA), and <br />VOCs were not detected at or above laboratory MRLs within Stantec's equipment blanks <br />QCEB-1-RG, QCEB-1-RM, QCEB-2-RG, QCEB-2-RM, and QCEB-3-RG. <br />Duplicate samples QCDUP-1, QCDUP-3 and QCDUP-7 were collected from L&M OU shallow <br />zone wells MW -45, MW -23 and MW -31, respectively, during the third quarter 2010 sampling <br />event. A comparison of the samples is shown below. <br />Analyte <br />Number of <br />Number <br />Minimum <br />Maximum <br /><0.05 <br />Detections <br />of A -Zone <br />Detected <br />Detected <br />Constituents <br />above the <br />Wells <br />Concentration in <br />Concentration in <br />0% <br />MRL <br />Analyzed <br />mg/L (Well ID) <br />mg/L (Well ID) <br />Arsenic <br />12 <br />14* <br />0.011 (MW -21) <br />0.24 (MW -18) <br />Cadmium <br />1 <br />14* <br />-- <br />0.0011 MW -31 <br />Nickel <br />1 <br />14* <br />-- <br />0.0068 MW -34 <br />Zinc <br />3 <br />14* <br />0.012 (MW -9 & <br />0.019 (MW -21) <br />MW -34 <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit <br />-- = Not Applicable <br />* = The RDA did not sample during <br />31010 <br />2.3.3.5 Quality Assurance/Quality Control Samples <br />TPHd, TPHo, TPHg, BTEX compounds, fuel oxygenates (MtBE, TAME, DIPE, EtBE, TBA), and <br />VOCs were not detected at or above laboratory MRLs within Stantec's equipment blanks <br />QCEB-1-RG, QCEB-1-RM, QCEB-2-RG, QCEB-2-RM, and QCEB-3-RG. <br />Duplicate samples QCDUP-1, QCDUP-3 and QCDUP-7 were collected from L&M OU shallow <br />zone wells MW -45, MW -23 and MW -31, respectively, during the third quarter 2010 sampling <br />event. A comparison of the samples is shown below. <br />Analyte <br />Sample # <br />MW -45 <br />Sample # <br />QCDUP-1 <br />% Difference <br />TPHg (mg/L) <br /><0.05 <br /><0.05 <br />0% <br />TPHd (mg/L) <br /><0.05 <br /><0.05 <br />0% <br />TPHo (mg/L) <br /><0.05 <br /><0.05 <br />0% <br />Benzene (mg/L) <br /><0.0005 <br /><0.0005 <br />0% <br />MtBE (mg/L) <br /><0.0005 <br /><0.0005 <br />0% <br />TBA (mg/L) <br /><0.005 <br /><0.005 <br />0% <br />IA-Fidewater7W Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.6 <br />