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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 /> 2.5.2.2 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 /> C-Zone <br /> Constituents Detections Wells Concentration in mg/L Concentration in mg/L <br /> above the MRL Analyzed (Well ID) (Well ID) <br /> TPHg 6 8 0.065 (MW-62) 3.0 (MW-64) <br /> TPHd 6 8 0.10 (MW-61) 2.2 (MW-54) <br /> TPHo 2 8 0.20 (MW-62) 0.59 (MW-63) <br /> Benzene 4 8 0.00086 (MW-64) 0.0054 (MW-66) <br /> Toluene 4 8 0.00052 (MW-64) 0.0009 (MW-66) <br /> Ethylbenzene 1 8 --- 0.00095 (MW-64) <br /> Total Xylenes 4 8 0.00051 (MW-63) 0.00418 (MW-54) <br /> MtBE 2 8 0.004 (MW-54) 0.013 (MW-64) <br /> TBA 3 8 0.0054 (MW-63) 0.064 (MW-54) <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(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.12 <br />