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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />Groundwater Monitoring and Sampling <br />April 30, 2012 <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc 2.4 <br />2.3.2.2 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 />Constituents <br />Number of <br />Detections <br />above the MRL <br />Number of <br />A-Zone Wells <br />Analyzed <br />Minimum <br />Detected <br />Concentration in <br />mg/L (Well ID) <br />Maximum <br />Detected <br />Concentration in <br />mg/L (Well ID) <br />TPHg 5 14 0.076 (MW-22) 3.7 (MW-18) <br />TPHd 11 14 0.057 (MW-34) 2.9 (MW-9) <br />TPHo 2 14 0.06 (MW-23) 0.15 (MW-9) <br />Benzene 1 14 --- 0.038 (MW-9) <br />Toluene 1 14 --- 0.0013 (MW-9) <br />Ethylbenzene 1 14 --- 0.00076 (MW-18) <br />Xylenes 2 14 0.00219 (MW-18) 0.00259 (MW-9) <br />MtBE 1 14 --- 0.0031 (MW-9) <br />TBA 1 14 --- 0.055 (MW-9) <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 />--- = Not applicable