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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 /> 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 4 8 0.16 (MW-65) 1.7 (MW-54) <br /> TPHd 7 8 0.054 (MW-61) 2.8 (MW-54) <br /> TPHo 6 8 0.070 (MW-66) 0.99 (MW-62) <br /> Benzene 2 8 0.0036 (MW-54) 0.0052 (MW-66) <br /> Toluene 2 8 0.0013 (MW-66) 0.0014 (MW-54) <br /> Total Xylenes 3 8 0.00209 (MW-64) 0.00504 (MW-54) <br /> MtBE 2 8 0.0037 (MW-54) 0.011 (MW-64) <br /> TBA 3 8 0.0056 (MW-63) 0.059 (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 /> 2.5.2.3 Volatile Organic Compounds <br /> VOCs with concentrations at or above the MRLs are summarized below. <br /> Number of Number Minimum Detected Maximum <br /> Detections of C-Zone Concentration in Detected <br /> Constituents above the Wells mg/L (Well ID) Concentration in <br /> MRL Analyzed mg/L (Well ID) <br /> n-butyl benzene 3 8 0.0018 (MW-66) 0.012 (MW-64) <br /> tert-butyl benzene 2 8 0.00054 (MW-54) 0.00064 (MW-65) <br /> sec-butyl benzene 3 8 0.0012 (MW-66) 0.0085 (MW-64) <br /> Isopropyl benzene 3 8 0.0055 (MW-66) 0.035 (MW-64) <br /> n-propyl benzene 3 8 0.013 (MW-66) 0.098 (MW-64) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per Liter <br /> MRL = Method Reporting Limit <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\3Q10\3Q10QSSRQRSRQMR Stockton_FINAL.doc 2.13 <br />