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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 /> TPHd was detected at a concentration of 0.0081 mg/L in QCEB-1-RM, just slightly above the <br /> method reporting limit of 0.005 mg/L; this low exceedence level is not indicative of cross- <br /> contamination. The remaining tested constituents were reported as non-detect at or above the <br /> laboratory MRL in the other five equipment blanks, indicating that no cross-contamination <br /> occurred during the sampling activities. <br /> Duplicate samples QCDUP-1 and QCDUP-3 were collected from L&M OU shallow zone wells <br /> MW-18 and MW-21, during 3Q13 sampling event. A comparison of the samples is shown on <br /> the following table. <br /> Analyte Sample # Sample# % Difference <br /> MW-18 QCDUP-1 <br /> TPHg (mg/L) 3.5 0.58 +/- 143.1% <br /> TPHd (mg/L) 0.97 0.61 +/-45.6% <br /> TPHo (mg/L) 0.059 0.056 +/- 5.2% <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-21 QCDUP-3 <br /> TPHg (mg/L) <0.05 <0.05 0% <br /> TPHd (mg/L) 0.34 0.41 +/- 18.7% <br /> TPHo (mg/L) <0.05 0.054 +/- 7.7% <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-18 and QCDUP-1 were within the acceptable limit <br /> (20%) with the exception of TPHg and TPHd. The RPD for TPHg was calculated at +/- 143.1%, <br /> approximately 123.1% outside the acceptable limit and the RPD for TPHd was calculated at +/- <br /> 45.6%, approximately 25.6% outside the acceptance limit; however, the reported analytical <br /> values for TPHg and TPHd in MW-18 are relatively consistent with historical values. The data <br /> can be considered representative. <br /> 2.3.2.5 General Laboratory Notes <br /> The following validation notes are consistent with the shallow zone quality assurance and <br /> quality control. Each set of issues corresponds directly with the denoted report (Appendix E). <br /> Laboratory Validation, report number 85467: <br /> There was no observed validation issues with A-Zone monitoring wells. <br /> 5tantec 2.4 <br />