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Appendix F:Data Usability Summary <br /> Representativeness <br /> Representativeness was assessed through the evaluation of method blank samples, trip and <br /> equipment 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. <br /> Field QC Results <br /> Two trip blanks(QA-T-100720, QA-T-100721), one field blank(QA-Field-R-100720), and two <br /> equipment rinsate blanks(QA-Tubing-R-100720, QA-Screen-R-100720)were submitted with <br /> the samples. Phenanthrene was detected in equipment rinsate blank QA-Tubing-R-100720 and <br /> at a similar concentration in associated sample SB-44-W-100720. The result for phenanthrene <br /> was qualified E as estimated. <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 4+2 <br /> °C and were analyzed within specified holding times. Sample preservations,when required by <br /> the analysis,were less than the acceptance pH limit of 2. <br /> Reporting Limits <br /> Data reported for this sampling event were reported with the laboratory MDLs for soil samples <br /> and program-specified reporting limits for groundwater samples. The MDL represents the <br /> lowest concentration point where an analyte can be positively identified,but the quantitation is <br /> an estimate. The program reporting limits were used to report data below the applicable action <br /> levels. In some cases,the action levels for compounds may be below the analytical capabilities <br /> of the instruments used to determine the concentration of target compounds in environmental <br /> samples. The LOQ is the lowest concentration of an analyte in a sample that the laboratory can <br /> report with precision and accuracy. Analytes that were reported between the MDL and LOQ in <br /> soil samples were qualified J as estimates. The qualified data are shown on Table F-1. <br /> Completeness <br /> Completeness is defined as the number of valid results (i.e., those not rejected) divided by the <br /> total number rejected. Based on this evaluation of the data against the QC objectives,the <br /> percentages of valid data for each method and matrix are 100 percent. <br /> Comparability <br /> Comparability is defined as the confidence with which one data set can be evaluated against <br /> another. Based on the data evaluation, the data are comparable with other laboratory data for <br /> similar samples and sample conditions. The sample collection techniques,EPA test methods, <br /> detection limits, analytical laboratory, units of measure, and sample preparation procedures were <br /> selected to ensure data comparability between sampling events. <br /> F-4 ;;Mz =9 The Benham Companies,LLC <br /> �+rL;�, A Y1hoF�4+.ned 5u6a5,vy <br />