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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 /> 2.3.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPHg, TPHd, TPHo, and Fuel Oxygenates with concentrations at or above the laboratory <br /> method reporting limits (MRLs) are summarized below. <br /> Number of Number of Minimum Maximum <br /> Constituents Detections A-Zone Wells CDetected <br /> onceDetectedntration in <br /> above the MRL Analyzed Concentration <br /> ID) Concentration in <br /> mg/L (Well ID) <br /> TPHg 5 14 0.078 (MW-22) 3.2 (MW-18) <br /> TPHd 8 14 0.052 (MW-31) 3.5 (MW-9) <br /> TPHo 3 14 0.089 (MW-23) 0.12 (MW-9) <br /> Benzene 1 14 --- 0.042 (MW-9) <br /> Toluene 1 14 --- 0.00 13 (MW-9) <br /> Ethylbenzene 1 14 --- 0.00072 (MW-18) <br /> Xylenes 2 14 0.00253 (MW-18) 0.00263 (MW-9) <br /> MtBE 1 14 --- 0.0028 (MW-9) <br /> TBA 2 14 0.0061 (2AMW-12) 0.060 (MW-9) <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 /> 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 /> I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3011 QSSR QRSR QMR Stockton_FINAL.doc 2.4 <br />