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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 2.18 <br />2.6.2.4 Semi-volatile Organic Compounds <br />Phenol was detected in samples collected from well MW-70 at a concentration of 0.013 mg/L. <br />There were no other SVOCs with concentrations at or above the MRLs in the eight D-Zone <br />wells sampled during 1Q12. <br />2.6.2.5 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 D-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 8 8 0.0079 (MW-73) 0.030 (MW-71) <br />Nickel 1 8 -- 0.0068 (MW-73) <br />Zinc 3 8 0.011 (MW-68 & <br />MW-70)0.034 (MW-73) <br />Definitions: <br />ID = Identification <br />mg/L = Milligrams per Liter <br />MRL = Method Reporting Limit <br />-- = Not Applicable <br />2.6.2.1 Quality Assurance/Quality Control Samples <br />Duplicate sample QCDUP-6 was collected from L&M OU D-Zone well MW-73 during 1Q12 <br />sampling event. A comparison of the samples is shown below. <br />Analyte Sample # <br />MW-73 <br />Sample # <br />QCDUP-6 % Difference <br />TPHg (mg/L)<0.05 <0.05 0% <br />TPHd (mg/L)0.60 0.55 +/-8.7% <br />TPHo (mg/L)0.16 0.17 +/-6.1% <br />Benzene (mg/L)<0.0005 <0.0005 0% <br />MtBE (mg/L)<0.0005 <0.0005 0% <br />TBA (mg/L)<0.005 <0.005 0% <br />2.6.2.2 General Laboratory Notes <br />The laboratory validation issues are consistent with the D-Zone quality assurance and quality <br />control. Each set of issues corresponds directly with the denoted report. All laboratory reports <br />are included in Appendix D.