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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> February 1, 2013 <br /> 2.6.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPHg, TPHd, TPHo, and Fuel Oxygenates with concentrations at or above the MRLs are <br /> summarized below. <br /> Number of Number ofMinimum Detected Maximum Detected <br /> D-Zone <br /> Constituents Detections Wells Concentration in mg/L Concentration in mg/L <br /> above the MRL Analyzed (Well ID) (Well ID) <br /> TPHg 7 8 0.067 (MW-69) 1.6 (MW-71) <br /> TPHd 8 8 0.36 (MW-68) 2.1 (MW-55) <br /> TPHo 5 8 0.12 (MW-70) 0.7 (MW-74) <br /> Benzene 2 8 0.00071 (MW-71) 0.18 (MW-70) <br /> Toluene 1 8 -- 0.0041 (MW-70) <br /> Ethylbenzene 1 8 -- 0.00085 (MW-70) <br /> Total Xylenes 1 8 -- 0.0045 (MW-70) <br /> MtBE 1 8 -- 0.0013 (MW-55) <br /> TBA 3 8 0.0063 (MW-70) 0.025 (MW-55) <br /> Definitions: <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> MtBE= Methyl tertiary butyl ether <br /> TBA = Tertiary butyl alcohol <br /> TPHd = Total petroleum hydrocarbons as diesel <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> TPHo = Total petroleum hydrocarbons as motor oil <br /> -- = Not applicable <br /> 2.6.2.3 Quality Assurance/Quality Control Samples <br /> Duplicate sample QCDUP-4 was collected from L&M OU D-Zone well MW-71 during 4Q12 <br /> sampling event. A comparison of the samples is shown below. <br /> Analyte Sample # Sample# % Difference <br /> MW-71 QCDUP-4 <br /> TPHg (mg/L) 1.6 1.6 0% <br /> TPHd (mg/L) 0.82 0.88 +/-7.1% <br /> TPHo (mg/L) <0.05 0.08 +/-46.2% <br /> Benzene (mg/L) 0.00071 0.00071 0% <br /> MtBE (mg/L) <0.0005 <0.0005 0% <br /> TBA (mg/L) 0.011 0.0093 +/- 16.7% <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 2.11 <br />