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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 /> Number of Number ofMinimum Detected Maximum Detected <br /> D-Zone <br /> Constituents Detections Wells Concentration in mg/L Concentration in mg/L <br /> above the MRL Analyzed (Well ID) (Well ID) <br /> TPHg 4 8 0.22 (MW-72) 1.6 (MW-71) <br /> TPHd 7 8 0.13 (MW-73) 1.7 (MW-55) <br /> TPHo 6 8 0.056 (MW-73) 0.53 (MW-74) <br /> Benzene 2 8 0.00065 (MW-71) 0.24 (MW-70) <br /> Toluene 1 8 -- 0.0059 (MW-70) <br /> Ethylbenzene 1 8 -- 0.0014 (MW-70) <br /> Total Xylenes 2 8 0.00056 (MW-71) 0.00670 (MW-70) <br /> MtBE 1 8 -- 0.00 19 (MW-55) <br /> TBA 3 8 0.0080 (MW-70) 0.026 (MW-55) <br /> Definitions: <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 2.16 <br />