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Stantec <br /> ' L 8r M OPERABLE UNIT-THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 27, 2010 <br /> TPH (mg/L <0.05 <0.05 0% <br /> ' TPHd (mg/L 0.41 0.31 NA <br /> TPHo (mg/L 0.13 0.07 NA <br /> Benzene (mg/L <0.0005 <0.0005 0% <br /> MtBE [mg/L) 0.0005 0.00051 +1- 2.0% <br /> TBA (mg/L <0.005 <0.005 0% <br /> ' TPH (mg/L <0.05 <0.05 0% <br /> TPHd (mg/L 0.30 <0.05 +/- 142.9% <br /> TPHo (mg/L 0.64 <0.05 +/- 171.0% <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 /> ' 2.3.3.6 General Laboratory Notes <br /> The following validation issues are consistent with the shallow zone quality assurance and <br /> quality control. Each set of issues corresponds directly with the denoted report (Appendix C). <br /> ' Validation issues with report number 73822: <br /> Relative percent difference (RPD) values associated with samples 2AMW-12, MW-21, MW-22, <br /> MW-28, MW-31, MW-34, and QCDUP-7 for the analytes 1,2,4-Trimethylbenzene and Styrene <br /> were outside of the stated quality control (QC) limits. This may indicate a possible bias for the <br /> ' reporting precision. The Matrix Spike (MS) and Matrix Spike Duplicate (MSD) results and <br /> laboratory control sample recoveries were within QC limits indicating accuracy in reporting. <br /> Because RPD was not run in the laboratory controlled spike (LCS) for these analytes, precision <br /> could not be confirmed. However, since neither analyte was detected in site samples, during <br /> this event and historically, the reported values are not considered to be affected. <br /> Validation issues with report number 73851 <br /> Relative percent difference values associated with samples MW-23 and MW-30 for the analytes <br /> Methanol and Vinyl Chloride were outside of the stated QC limits. This may indicate a possible <br /> bias for the reporting precision. The MS/MSD results and laboratory control sample recoveries <br /> were within QC limits indicating accuracy in reporting. Because RPD was not run in the LCS for <br /> these analytes, precision could not be confirmed. However, since neither analyte was detected <br /> in site samples, during this event and historically, the reported values are not considered to be <br /> affected. <br />' B ndE teAW StoaE n(Pare 2"415)%RePort QMRt2010ZQIO CIIGQSSRORSROMR StMkron_FINAL.dm 2,7 <br />