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L & M OPERABLE UNIT-THIRD QUARTER 2013 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> November 1, 2013 <br /> 2.6.2.1 Dissolved Arsenic <br /> B-Zone wells are not sampled for arsenic in accordance with MRP R-5-2012-0805. <br /> 2.6.2.2 Separate Phase Hydrocarbons <br /> During 3Q13, measurable SPH or SPH-sheen was not observed in the D-Zone wells. <br /> 2.6.2.3 Petroleum Hydrocarbons and Fuel Oxygenates <br /> TPHg, TPHd, TPHo, and Fuel Oxygenates with concentrations at or above the MRLs are <br /> summarized below. <br /> Number of Number ofMinimum Detected Maximum Detected <br /> D-Zone <br /> Constituents Detections Wells Concentration in mg/L Concentration in mg/L <br /> above the MRL Analyzed (Well ID) (Well ID) <br /> TPHg 3 8 0.14 (MW-72) 1.1 (MW-55) <br /> TPHd 8 8 0.10 (MW-70) 1.8 (MW-55) <br /> TPHo 5 8 0.055 (MW-69) 0.34 (MW-73) <br /> Benzene 4 8 0.00067 (MW-73) 0.0035 (MW-70) <br /> MTBE 1 8 -- 0.0016 (MW-55) <br /> TBA 2 8 0.009 (MW-71) 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 /> 2.6.2.1 Quality Assurance/Quality Control Samples <br /> Duplicate sample QCDUP-6 was collected from L&M OU D-Zone well MW-72 during 3Q13 <br /> sampling event. A comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-55 QCDUP-6 <br /> TPHg (mg/L) 0.14 0.12 +/- 15.4% <br /> TPHd (mg/L) 0.28 0.32 +/- 13.3% <br /> TPHo (mg/L) 0.069 0.054 +/-24.4% <br /> Benzene (mg/L) <0.0005 <0.0005 0% <br /> MTBE (mg/L) <0.0005 <0.0005 0% <br /> 5tantec 2.10 <br />