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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 />2.4.2.1 Separate Phase Hydrocarbons <br />During the third quarter 2010, measurable SPH or SPH -sheen was observed in eight wells. <br />SPH thicknesses for deep zone wells are summarized below. <br />Well Identification <br />SPH Thickness <br />(feet) <br />MW -17 <br />Sheen <br />MW -43 <br />0.31 <br />MW -46 <br />Sheen <br />MW -47 <br />0.01 <br />MW -48 <br />0.03 <br />MW -49 <br />0.72 <br />MW -50 <br />30.03 <br />MW -52 <br />0.01 <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 />I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.9 <br />Number of <br />Number ofMinimum <br />B -Zone <br />Detected <br />Maximum Detected <br />Constituents <br />Detections <br />Wells <br />Concentration in mg/L <br />Concentration in mg/L <br />above the MRL <br />Analyzed <br />(Well ID) <br />(Well ID) <br />TPI -Ig <br />4 <br />15 <br />0.072 (MW -29) <br />0.95 (MW -59) <br />TPI -Id <br />11 <br />15 <br />0.062 (MW -44) <br />0.68 (MW -51) <br />TPHo <br />5 <br />15 <br />0.061 (MW -16) <br />0.52 (MW -58) <br />Benzene <br />1 <br />15 <br />-- <br />0.0049 (MW -58) <br />Toluene <br />2 <br />15 <br />0.00078 (MW -24) <br />0.0013 (MW -58) <br />Ethylbenzene <br />1 <br />15 <br />-- <br />0.00053 (MW -58) <br />Total Xylenes <br />2 <br />15 <br />0.0010 (MW -24) <br />0.00371 (MW -58) <br />MtBE <br />4 <br />15 <br />0.00063 (MW -29) <br />0.00098 (MW -44) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit <br />MtBE= Methyl tertiary butyl ether <br />TPI -Id = 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 (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.9 <br />