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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 /> TPHo 4 13 0.06 (MW-26) 0.29 (MW-24) <br /> Ethylbenzene 1 13 --- 0.00 13 (MW-59) <br /> MTBE 3 13 0.0006 (MW-59) 0.00076 (MW-44) <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 /> TPHg = 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 and <br /> MW-58. Comparison of the samples are shown below. <br /> Analyte Sample # Sample # oda Difference <br /> MW-24 QCDUP-2 <br /> TPHg (mg/L) <0.05 <0.05 0% <br /> TPHd (mg/L) 0.28 0.22 +/-24.0% <br /> TPHo (mg/L) 0.29 0.22 +/-27.5% <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 /> Analyte Sample # Sample # oda Difference <br /> MW-58 QCDUP-4 <br /> TPHg (mg/L) <0.05 <0.05 0% <br /> TPHd (mg/L) 0.07 0.065 +/- 7.4% <br /> TPHo (mg/L) <0.05 <0.05 0% <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 /> The calculated TPD between sample MW-24 and QCDUP-2 were within the acceptable limit <br /> (20%) with the exception of TPHd and TPHo. The RPD for TPHd was calculated at +/- 24.0%, <br /> approximately 4.0% outside the acceptable limit and the RPD for TPHo was calculated at +/- <br /> 27.5%, approximately 7.5% outside the acceptance limit; however, the reported analytical <br /> 5tanw-L 2.6 <br />