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Data Usability Summary Page 2 of 3 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 relative percent differences(RPDs)for laboratory control sample samples/laboratory control sample duplicates (LCS/LCSDs)provided information on the precision of the analytical procedures. Evaluation of the percent recoveries(%Rs) of LCS/LCSDs,and surrogates provided information on accuracy. Project- specific matrix spike/matrix spike duplicate(MS/MSD) samples were collected for this data set. All LCS/LCSD%Rs,LCS/LCSD RPDs, and surrogate%Rs were within the required laboratory control limits. Representativeness Representativeness was assessed through the evaluation of method blank samples, equipment rinsate blank sample, chain-of-custody forms,preservation, and holding times. Field Duplicate Samples Field duplicate pairs were not collected with this data set. Method Blank Results All laboratory method blanks were free of contamination. Chain-Of-Custody Forms Sample analytical results were evaluated for agreement with the chain-of-custody form. Based on the evaluation, all samples were received at the laboratory in the appropriate containers and in good condition with the chain-of-custody form filled out properly. Preservation and Holding Times Samples were preserved in the field as appropriate,were received at the laboratory within the acceptance temperature criterion of 4+2 °C,and were prepared and analyzed within specified holding times. The sample preservations,when required by the analysis,were less than the acceptance pH limit of 2. Reporting Limits Data reported for this sampling event were reported with the laboratory MDLs. The MDL represents the lowest concentration point where an analyte can be positively identified,but the quantitation is an estimate. The LOQ is the lowest concentration of an analyte in a sample that the laboratory can report with precision and accuracy. Analytes that were reported between the MDL and LOQ for this data set were qualified J as estimates. Laboratory Fuel Notes for TPHd Analysis The laboratory noted that the observed hydrocarbon fuel pattern for TPHd analysis in sample WFSMW-1- W-070430 was#2 fuel/diesel and an additional pattern that elutes later in the target carbon range. The samples were also silica-gel cleaned prior to the analysis and TPHd were not detected after the silica-gel cleanup. This indicates the TPHd results were likely biased high due to biogenic material that was removed during silica-gel analysis. Completeness Completeness is defined as the number of valid results(i.e.,those not rejected)divided by the total number rejected. Based on this evaluation of the data against the QC objectives,the percentages of valid data for each method and matrix are 100 percent.