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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> January 31, 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 0.10 (MW-22) 3.8 (MW-18) <br /> TPHd 8 14 0.32 (MW-23) 4.5 (MW-9) <br /> TPHo 1 14 --- 0.30 (MW-9) <br /> Benzene 1 14 --- 0.025 (MW-9) <br /> Toluene 2 14 0.00054 (MW-18) 0.00095 (MW-9) <br /> Ethylbenzene 2 14 0.00064 (MW-9) 0.00077 (MW-18) <br /> Xylenes 2 14 0.00226 (MW-18) 0.0026 (MW-9) <br /> MtBE 3 14 0.00053 (MW-20) 0.002 (MW-9) <br /> TBA 3 14 0.0059 (MW-21) 0.062 (MW-9) <br /> DIPE 1 14 --- 0.0006 (MW-9) <br /> Definitions: <br /> DIPE = Di-isopropyl ether <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(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.4 <br />