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Data Usability Summary • Comparability. DATA USABILITY SUMMARY The following sections summarize the findings of the data evaluation process. The following data validation qualifiers were used in the data evaluation: ualifier Description E Indicates the reported value is estimated due to associated quality control results. J Indicates the reported value is an estimated concentration detected between the method detection limit(MDL)and limit of quantitation (LOQ). A summary of qualified data is provided in Table B-1. Data validation reason codes for all qualified data with the associated reasons for qualification are also presented and defined on Table B-1. Precision and Accuracy The precision and accuracy of field and laboratory QC samples were evaluated. The calculated relative percent differences(RPDs)for field duplicate and MS/MSD pairs provided information on the precision of sampling and analytical procedures. The RPDs for laboratory control samples and laboratory control sample duplicates (LCS/LCSDs)provided information on the precision of the analytical procedures. Evaluation of the percent recoveries(%Rs) of MS/MSDs,LCS/LCSDs, and surrogates provided information on accuracy. Field Duplicates Sample WFSMW-I-WD-060816 is a field duplicate of sample WFSMW-I-W-060816. TPHd and phenanthrene were detected in the field sample and field duplicate. The RPD for TPHd in the field sample and field duplicate was 63 percent. The field duplicate results indicate the samples are heterogeneous for TPHd(as compared to the other parameters analyzed in the field duplicate pairs). The heterogeneity may be due to matrix interferences based on the laboratory note that the sample chromatogram patterns included diesel and an additional pattern that elutes later in the diesel-hydrocarbon range. The results for TPHd in the samples were qualified"E"because the RPD exceeds the precision goal of 30 percent. The RPD for phenanthrene detected in the field sample and field duplicate was 0 percent. MS/MSDs Extra sample volume was collected for WFSMW-I-W-060816 for the laboratory to prepare a project- specific MS/MSD for all analyses. All%Rs and RPDs for MS/MSDs were within the required control limits,with the following exceptions. The%Rs for naphthalene, indeno(1,2,3-cd)pyrene, dibenz(a,h)anthracene, and benzo(g,h,i)perylene were above the upper control limit. The expected bias in associated sample results is high,but none of the compounds were detected in the samples. Therefore,the bias was not realized and no data were qualified. The RPD for TPHd with silica gel was 23 percent, which is above the required control limit of 20 percent. All associated sample results were non-detect for TPHd with silica gel and no data were qualified. LCS/LCSDs A LCS was analyzed with each analytical batch of samples. A LCSD was analyzed for TPHg and BTEX. All LCS and LCSD %Rs were within the required control limits,with one exception: the%R for pyrene was above the upper control limit. There were no detections of pyrene in any associated samples, and no data were qualified.