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Attachment D: Data Usability Summary ' <br /> an estimate. Analytes that were reported between the MDL and RL were qualified J as , <br /> estimated. In some cases, the action levels for compounds may be below the analytical <br /> capabilities of the instruments used to determine the concentration of target compounds in ' <br /> environmental samples. <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 /> SUMMARY <br /> Based on SAIC's evaluation, all analytical data are usable as qualified for the purpose of , <br /> determining chemical concentrations in soil samples collected at the Tracy Pump Station in <br /> Tracy, California. ' <br /> Data evaluated for this report were qualified J for concentrations reported between the MDL and <br /> RL, and E for method blank contamination and MS/MSD recoveries. Qualified data with <br /> applicable reason codes are shown in Table D-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 otherwise noted. ' <br /> i <br />