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Attachment B: Data Usability Summary and Laboratory Analytical Results(October 2007) <br /> Preservation and Holding Times <br /> Samples were preserved in the field as appropriate,were received at the laboratory within the acceptance <br /> temperature criterion of 4 f 2 °C, and were prepared and analyzed within specified holding times. <br /> Sample preservations,when required by 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. The MDL represents the <br /> lowest concentration point where an analyte can be positively identified,but the quantitation is an <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. Evaluation of the data against the QC objectives indicated that the percentages of valid <br /> data for each method are 100 percent,with no data rejected for this investigation. <br /> Comparability <br /> The data evaluation determined that the data are comparable with other laboratory data for similar <br /> samples and sample conditions. The sample collection techniques,EPA test methods, detection limits, <br /> analytical laboratory,units of measure, and sample preparation procedures were selected to ensure data <br /> comparability on this project. <br /> SUMMARY <br /> SAIC's evaluation concluded that all analytical data contained in sample group 1063247 are usable as <br /> qualified for the purpose of determining chemical concentrations in groundwater at the Vernalis Pump <br /> Station site in Vernalis, California. <br /> Data associated with SDGs for this sampling event were qualified for results reported between the <br /> laboratory MDL and LOQ, surrogate percent recoveries and blank detections. Qualified data with <br /> applicable reason codes are shown 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 /> Page E.1-3 - - <br /> �mii <br /> From Science[osolullons <br />