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Stantec <br /> L & M OPERABLE UNIT-THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 28, 2011 <br /> 2.4.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPI-Ig, TPI-Id, TPHo, and Fuel Oxygenates with concentrations at or above the MRLs are <br /> summarized below. <br /> Number of Number ofMinimum Detected Maximum Detected <br /> B-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 15 0.15 (MW-29) 2.5 (MW-58) <br /> TPI-Id 10 15 0.069 (MW-16) 0.82 (MW-51) <br /> TPHo 6 15 0.069 (MW-56) 0.21 (MW-57) <br /> Benzene 1 15 --- 0.0083 (MW-58) <br /> Toluene 1 15 --- 0.0026 (MW-58) <br /> Ethylbenzene 1 15 --- 0.0011 (MW-58) <br /> Xylenes 2 15 0.00051 (MW-42) 0.00780 (MW-58) <br /> MtBE 6 15 0.00060 (MW-51) 0.00099 (MW-59) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> MtBE= Methyl tertiary butyl ether <br /> TPHd = 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(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.9 <br />