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Attachment C: Data Usability Summary and Laboratory Analytical Reports <br /> Completeness <br /> ' Completeness is defined as the number of valid results (i.e., those not rejected) divided by the <br /> total number rejected. Evaluation of the data against the QC objectives determined that the <br /> percentages of valid data for each method are 100 percent, with no data rejected for this <br /> investigation. <br /> Comparability <br /> The data evaluation determined that 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 on this project. <br /> SUMMARY <br /> SAIC's evaluation concluded that all analytical data contained in sample delivery groups (SDGs) <br /> 1128527 and 1128950 are usable as qualified for the purpose of determining chemical <br /> concentrations in groundwater at the Alden Park location in Tracy, California. <br /> Data associated with SDGs for this sampling event were qualified for method blank, holding <br /> time exceedances, and extraneous peaks in the TPH chromatography. Qualified data with <br /> applicable reason codes are shown in Table C-1. <br /> Analytical data collected in support of this investigation are considered precise, accurate, <br /> representative, complete, and comparable, and they may be used for their intended purposes <br /> unless noted otherwise. <br />