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Laboratory Fuel Notes for TPHd Analysis <br /> The laboratory noted that the observed hydrocarbon fuel patterns for TPHd analysis were <br /> atypical in groundwater samples MW-3-W-090211 and field duplicate MW-3-WD- <br /> 090211. The laboratory noted that the observed chromatogram patterns for TPHd and <br /> TPHd with silica-gel cleanup included hydrocarbons that eluted later than the diesel <br /> range. No data were qualified for the TPHd fuel pattern notes. <br /> COMPLETENESS <br /> Completeness is defined as the number of valid results (i.e., those not rejected) divided <br /> by the total number rejected. Evaluation of the data against the QC objectives concluded <br /> that the 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 <br /> against another. The data evaluation determined that the data are comparable with other <br /> laboratory data for similar samples and sample conditions. The sample collection <br /> techniques, EPA test methods, detection limits, analytical laboratory, units of measure, <br /> and sample preparation procedures were selected to ensure data comparability between <br /> sampling events. <br /> SUMMARY <br /> SAIC's evaluation concluded that all analytical data are usable as qualified for the <br /> purpose of determining chemical concentrations in groundwater collected at the US Can— <br /> Welty Road site in Vernalis, California. <br /> Data evaluated for this report were qualified E for results associated with surrogate <br /> recoveries, LCS recoveries, and MS/MSD recoveries. Qualified data with applicable <br /> 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 <br /> purposes unless otherwise noted. <br />