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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 2.14 <br />2.5.2.3 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 C-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 3 8 0.0024 (MW-66) 0.0093 (MW-64) <br />tert-butyl benzene 1 8 --- 0.00091 (MW-65) <br />sec-butyl benzene 4 8 0.0016 (MW-66) 0.0059 (MW-64) <br />Isopropyl benzene 5 8 0.00052 (MW-63) 0.026 (MW-64) <br />n-propyl benzene 3 8 0.0048 (MW-54) 0.076 (MW-64) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per liter <br />MRL = Method reporting limit <br />--- = Not applicable <br />2.5.2.4 Semi-volatile Organic Compounds <br />There were no SVOCs with concentrations at or above the MRLs in the eight C-Zone wells <br />sampled during 1Q12. <br />2.5.2.5 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 C-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 7 8 0.0094 (MW-61) 0.023 (MW-65) <br />Copper 1 8 -- 0.0070 (MW-62) <br />Zinc 3 8 0.011 (MW-64) 0.033 (MW-62) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit <br />-- = Not Applicable