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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 />2.3.3.1 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 />I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.4 <br />Number of <br />Number of <br />Minimum <br />Maximum <br />Constituents <br />Detections <br />A -Zone Wells <br />onceDetectedntration in <br />Concentration <br />C <br />Detected <br />above the MRL <br />Analyzed <br />ID) <br />Concentration in <br />mg/L (Well ID) <br />TPHg <br />5 <br />14* <br />0.10 (MW -22) <br />2.6 (MW -18) <br />TPHd <br />9 <br />14* <br />0.30 (MW -31) <br />6.1 (2AMW-12) <br />TPHo <br />5 <br />14* <br />0.071 (2AMW-12) <br />0.64 (MW -31) <br />Benzene <br />1 <br />14* <br />--- <br />0.035 (MW -9) <br />Toluene <br />1 <br />14* <br />--- <br />0.00098 (MW -9) <br />Ethylbenzene <br />2 <br />14* <br />0.00073 (MW -18) <br />0.0012 (MW -9) <br />Xylenes <br />4 <br />14* <br />0.00060 (MW -20) <br />0.0027 (MW -9) <br />MtBE <br />3 <br />14* <br />0.0005 (MW -23) <br />0.0024 (MW -9) <br />TBA <br />2 <br />14* <br />0.0079 (2AMW-12) <br />0.065 (MW -9) <br />DIPE <br />1 <br />14* <br />--- <br />0.00055 (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 />* = The RDA did not sample during 3010 <br />I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.4 <br />