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' Attachment D: Data Usability Summary <br /> ' MS/MSDs <br /> Project-specific MS and MSD samples were not collected as part of this data set; however, the <br /> laboratory selected some project samples as part of the batch QC for PAHs and BTEX analyses. <br /> Data were not qualified if the%R for an MS or MSD was above the control limit and the <br /> associated sample result was non-detect. In these cases, the result would not have been affected <br /> ' by a potential high bias due to matrix interference. The MSD for fluorene was 123 percent in the <br /> MSD prepared from sample SB-30-5' and the analyte was detected in the unspiked sample. The <br /> result was not qualified however,because the concentration was between the MDL and RL and <br /> ' was already qualified J as estimated. One result in this data set was qualified for MS and MSD <br /> recoveries. The result for phenanthrene in SB-45-4' was qualified E as estimated because the <br /> recoveries in the MS and MSD prepared from the sample were below the laboratory control <br /> ' limits. The result may be biased low due to matrix interferences. <br /> The MS/MSD RPDs were all within laboratory control limits for the MS and MSD samples <br /> ' prepared from project samples in this data set with one exception. The RPD for naphthalene was <br /> 25 percent, above the control limit of 20 percent for the MS and MSD prepared from sample <br /> SB-43-9'. The LCS/LCSD RPD was within the control limits. Data were not qualified because <br /> ' the MS and MSD %Rs were within the control limit, and the actual RPD was not significantly <br /> above the control limit. <br /> REPRESENTATIVENESS <br /> ' Representativeness was assessed through the evaluation of method blank samples, equipment <br /> blank samples, chain-of-custody forms, preservation, and holding times. <br /> ' Method Blank Results <br /> Laboratory method blanks were evaluated for any detection above the laboratory MDL. No <br /> target analytes were detected in any of the method blanks analyzed as part of this data set,with <br /> one exception. Chrysene was detected at 0.00021 milligrams per kilogram (mg/kg) in the <br /> method blank associated with 14 of the samples analyzed for PAHs in this data set. The results <br /> for chrysene were qualified E in sample SB-39-9.5', SB-42-9.5', and SB-47-3' because the <br /> ' results were within 5 times the concentration detected in the method blank. Chrysene was either <br /> not detected in the remaining samples or the analyte was detected at a concentration above <br /> 5 times and would not likely be biased by any laboratory contamination. <br /> ' Chain-Of-Custody Forms <br /> Sample analytical results were evaluated for agreement with the chain-of-custody form. Based <br /> ' on the evaluation, all samples were received at the laboratory in the appropriate containers and in <br /> good condition with the chain-of-custody form filled out properly. <br /> Preservation and Holding Times <br /> ' All samples were received at the laboratory within the acceptance temperature criterion of <br /> 4+2°C and were analyzed within specified holding times. <br /> ' Reporting Limits <br /> Data reported for this sampling event were reported at the laboratory RLs. The RL is the lowest <br /> 1 concentration of an analyte in a sample that the laboratory can report with precision and <br /> accuracy. The laboratory report also listed the MDLs for each result. The MDL represents the <br /> lowest concentration point where an analyte can be positively identified,but the quantitation is <br />