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laboratory control spike/laboratory control spike duplicate recoveries ' (LCS/LCSDs) ' Following review of the data, some of the results were flagged with a qualifier because of exceedances in the QC criteria for the parameters listed in the preceding paragraph. ' In accordance with EPA Guidance, the flag denotes the following datum qualifier: "K" Estimated value, based on non-compliant RPD. ' This issue and associated data are discussed in further detail in the following text. ' Data Completeness The SDG analytical report from Curtis & Tompkins was reviewed for completeness. ' All samples were received by Curtis & Tompkins, under chain-of-custody protocols and analyzed in accordance with the instructions on the chain-of-custody form. I Holding Time All samples were prepared and analyzed within the recommended holding times ' outlined in the U.S. EPA Guidance. Blanks I No field blanks were collected as part of this investigation. Laboratory blanks were the I only blanks evaluated. N-Butylbenzene was detected in the laboratory blank at 0.9 microgram per liter (µg/l). However, none of the field samples had n-butybenzene detected above laboratory reporting limits. Therefore, the detection in the laboratory I blank did not cause data to be qualified. Surrogate Spikes ' Surrogate spike evaluation is only applicable for EPA Methods 8260B, 8270C, and I 8015. The surrogate recovery for U.S. EPA method 8270C was non-compliant for sample MW-7. The surrogate toluene-d8 was recovered above acceptance criterion. However, because no target SVOCs were detected above analytical reporting limits in I sample MW-7 and the surrogate recovery was biased high, no data was qualified. The remaining surrogate recoveries were compliant. Relative Percent Difference I Duplicate results are assessed using the relative percent difference (RPD) between I duplicate measurements. If the RPD between primary and duplicate field samples I I