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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 /> 2.4.2.2 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 /> Number of Number ofMinimum Detected Maximum Detected <br /> B-Zone <br /> Constituents Detections Wells Concentration in mg/L Concentration in mg/L <br /> above the MRL Analyzed (Well ID) (Well ID) <br /> TPI-Ig 5 15 0.05 (MW-56) 1.0 (MW-59) <br /> TPHd 8 15 0.088 (MW-60) 1.1 (MW-51) <br /> TPHo 2 15 0.078 (MW-60) 0.29 (MW-59) <br /> MtBE 5 15 0.00065 (MW-51) 0.00 13 (MW-58) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> MtBE= Methyl tertiary butyl ether <br /> TPHd = Total petroleum hydrocarbons as diesel <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> TPHo = Total petroleum hydrocarbons as motor oil <br /> 2.4.2.3 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 B-Zone Concentration in Detected <br /> Constituents above the Wells mg/L (Well ID) Concentration in <br /> MRL Analyzed mg/L (Well ID) <br /> tert-butyl benzene 1 15 -- 0.0012 (MW-29) <br /> sec-butyl benzene 1 15 -- 0.00054 (MW-59) <br /> Isopropyl benzene 1 15 -- 0.00058 (MW-59) <br /> n-propyl benzene 1 15 -- 0.0019 (MW-59) <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> -- = Not applicable <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 2.9 <br />