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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 2.9 <br />2.4.2.2 Petroleum Hydrocarbons and Fuel Oxygenates <br />TPHg, TPHd, TPHo, and Fuel Oxygenates with concentrations at or above the MRLs are <br />summarized below. <br />Constituents <br />Number of <br />Detections <br />above the MRL <br />Number of <br />B-Zone <br />Wells <br />Analyzed <br />Minimum Detected <br />Concentration in mg/L <br />(Well ID) <br />Maximum Detected <br />Concentration in mg/L <br />(Well ID) <br />TPHg 5 15 0.059 (MW-29) 2.0 (MW-58) <br />TPHd 15 15 0.054 (MW-35) 0.75 (MW-51) <br />TPHo 9 15 0.051 (MW-27) 0.13 (MW-60) <br />Benzene 1 15 --- 0.0067 (MW-58) <br />Toluene 2 15 0.00052 (MW-32) 0.0022 (MW-58) <br />Ethylbenzene 1 15 --- 0.00083 (MW-58) <br />Xylenes 3 15 0.00058 (MW-42) 0.0064 (MW-58) <br />MtBE 6 15 0.00050 (MW-59) 0.0013 (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 />TPHd = Total petroleum hydrocarbons as diesel <br />TPHg = Total petroleum hydrocarbons as gasoline <br />TPHo = Total petroleum hydrocarbons as motor oil <br />--- = Not applicable