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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 /> 2.6.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPI-Ig, 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 /> TPI-Ig 4 8 0.20 (MW-72) 0.87 (MW-70) <br /> TPI-Id 8 8 0.093 (MW-69) 1.9 (MW-55) <br /> TPHo 6 8 0.056 (MW-69) 0.90(MW-68) <br /> Benzene 2 8 0.0011 (MW-71) 0.20 (MW-70) <br /> Toluene 1 8 -- 0.0049 (MW-70) <br /> Ethylbenzene 1 8 -- 0.00082 (MW-70) <br /> Total Xylenes 2 8 0.00070 (MW-55) 0.0070 (MW-70) <br /> MtBE 1 8 -- 0.002 (MW-55) <br /> TBA 3 8 0.0064 (MW-70) 0.034 (MW-55) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per Liter <br /> MRL = Method Reporting Limit <br /> MtBE= Methyl tertiary butyl ether <br /> TBA = Tertiary butyl alcohol <br /> TPI-Id = Total petroleum hydrocarbons as diesel <br /> TPI-Ig = Total petroleum hydrocarbons as gasoline <br /> TPHo = Total petroleum hydrocarbons as motor oil <br /> -- = Not applicable <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\3Q10\3Q10QSSRQRSRQMR Stockton_FINAL.doc 2.16 <br />