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Attachment B: Data Usability Summary <br /> estimate. The LOQ is the lowest concentration of an analyte in a sample that the laboratory can report <br /> with precision and accuracy. Analytes that were reported between the MDL and LOQ for this data set <br /> were qualified J as estimates. <br /> Completeness <br /> Completeness is defined as the number of valid results(i.e.,those not rejected)divided by the total <br /> number rejected. The evaluation of the data against the QC objectives determined that the percentages of <br /> valid data for each method and matrix are 100 percent. <br /> Comparability <br /> The data evaluation concluded that the data are comparable with other laboratory data for similar samples <br /> and sample conditions. The sample collection techniques,EPA test methods, detection limits, analytical <br /> laboratory,units of measure, and sample preparation procedures were selected to ensure data <br /> comparability. <br /> SUMMARY <br /> SAIC's evaluation concluded that all analytical data are usable as qualified for the purpose of determining <br /> chemical concentrations in groundwater at the site. <br /> Data associated with laboratory report 1075638 for this sampling event were qualified J for results <br /> reported between the laboratory's MDL and LOQ. Qualified data with applicable reason codes are shown <br /> in Table B-1. <br /> Analytical data collected in support of this investigation are considered precise, accurate,representative, <br /> complete, and comparable, and they may be used for their intended purposes unless noted otherwise. <br />