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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 2.5 <br />2.3.2.3 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 A-Zone <br />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 />n-butyl benzene 3 14 0.00085 (MW-18) 0.0048 (MW-9) <br />tert-butyl benzene 5 14 0.00074 <br />(2AMW-12)0.0029 (MW-30) <br />sec-butyl benzene 3 14 0.0022 (MW-20) 0.013 (MW-18) <br />Isopropyl benzene 4 14 0.00068 (MW-30) 0.065 (MW-18) <br />p-isopropyl toluene 1 14 -- 0.0021 (MW-18) <br />n-propyl benzene 3 14 0.0049 (MW-20) 0.059 (MW-18) <br />1,3,5-Tri-methyl benzene 1 14 -- 0.0007 (MW-18) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per liter <br />MRL = Method reporting limit <br />-- = Not applicable <br />2.3.2.4 Semi-volatile Organic Compounds <br />There were no SVOCs with concentrations at or above the MRLs in shallow zone wells during <br />1Q12. <br />2.3.2.5 Dissolved Metals <br />Dissolved metals with concentrations detected at or above the MRLs are summarized below. <br />Constituents <br />Number of <br />Detections <br />above the <br />MRL <br />Number <br />of A-Zone <br />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 />Arsenic 12 14 0.0054 (MW-21) 0.10 (MW-18) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit