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L & M OPERABLE UNIT-THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 31, 2014 <br /> Number of <br /> Number of Minimum Detected Maximum Detected <br /> Constituents Detections B-Zone Concentration in mg/L Concentration in mg/L <br /> above the MRL Wells (Well ID) (Well ID) <br /> Analyzed <br /> TPHg 4 13 0.17 (MW-51) 2.0 (MW-59) <br /> TPHd 12 13 0.051 (MW-26) 1 .3 (MW-51) <br /> TPHo 7 13 0.067 (MW-42) 1 .7 (MW-60) <br /> Benzene 1 13 --- 0.0028 (MW-59) <br /> Toluene 1 13 --- 0.001 (MW-59) <br /> Ethylbenzene 1 13 --- 0.0057 (MW-59) <br /> Total Xylenes 1 13 --- 0.0018(MW-59) <br /> MTBE 2 13 0.00061 (MW-44) 0.00062 (MW-42) <br /> TBA 0 13 -- -- <br /> Definitions: <br /> ID = Identification <br /> mg/L = Milligrams per liter <br /> MRL = Method reporting limit <br /> MTBE= Methyl tertiary butyl ether <br /> TPHd = Total petroleum hydrocarbons as diesel <br /> TPI-Ig = Total petroleum hydrocarbons as gasoline <br /> TPHo = Total petroleum hydrocarbons as motor oil <br /> --- = Not applicable <br /> 2.4.2.3 Dissolved Arsenic <br /> B-Zone wells are not sampled for arsenic in accordance with MRP R-5-2012-0805. <br /> 2.4.2.4 Quality Assurance/Quality Control Samples <br /> Duplicate samples QCDUP-2 and QCDUP-4 were collected from L&M OU wells MW-24 <br /> and MW-58, respectively. Comparison of the samples is shown below. <br /> Analyte Sample # Sample # % Difference <br /> MW-24 QCDUP-2 <br /> TPH (mg/L <0.05 <0.05 0% <br /> TPHd (mg/L) 0.08 0.087 +/- 8.417o <br /> TPHo (mg/L) <0.05 <0.05 0% <br /> Benzene <0.0005 <0.0005 0% <br /> m /L <br /> MTBE (mg/L) <0.0005 <0.0005 Oho <br /> TBA (mg/L) <0.005 <0.005 Oho <br /> 5ta ntec 2.8 <br />