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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 2.17 <br />Constituents <br />Number of <br />Detections <br />above the MRL <br />Number of <br />D-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 4 8 0.13 (MW-72) 1.3 (MW-71) <br />TPHd 8 8 0.24 (MW-69 & MW-74) 1.6 (MW-55) <br />TPHo 5 8 0.06 (MW-74) 0.16 (MW-73) <br />Benzene 2 8 0.0038 (MW-71) 0.12 (MW-70) <br />Toluene 1 8 -- 0.0030 (MW-70) <br />Total Xylenes 2 8 0.00122 (MW-71) 0.0057 (MW-70) <br />MtBE 1 8 -- 0.0016 (MW-55) <br />TBA 3 8 0.0062 (MW-70) 0.024 (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 />2.6.2.3 Volatile Organic Compounds <br />VOCs with concentrations at or above the MRLs are summarized below. <br />Constituents <br />Number of <br />Detections <br />above the <br />MRL <br />Number <br />of D-Zone <br />Wells <br />Analyzed <br />Minimum Detected <br />Concentration in <br />mg/L (Well ID) <br />Maximum <br />Detected <br />Concentration in <br />mg/L (Well ID) <br />n-butyl benzene 2 8 0.00077 (MW-55) 0.0082 (MW-71) <br />sec-butyl benzene 3 8 0.00064 (MW-72) 0.0084 (MW-71) <br />Iso-propyl benzene 4 8 0.00078 (MW-72) 0.045 (MW-71) <br />n-propyl benzene 3 8 0.0016 (MW-55) 0.11 (MW-71) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per liter <br />MRL = Method reporting limit <br />-- = Not applicable