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• <br /> 7 <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 3486 <br /> Accuracy and Precision, Water: <br /> Analysis Snake Recove ies* RPD** <br /> Benzene 98 ,90 8% <br /> Toluene 98 ,92 6% <br /> Ethyl Benzene 96,92 4% <br /> Xylenes 100,100 0% <br /> TPH as Gasoline 103 ,107 4% <br /> TPH as Diesel 107, 112 5% <br /> Blank, Water: <br /> Analysis Measured Value <br /> Benzene <.5 ug/l <br /> Toluene <.5 ug/l <br /> Ethylbenzene <.5 ug/l <br /> . Xylenes <. 5 ug/l <br /> TPH as Gasoline <50 ug/l <br /> TPH as Diesel <50 ug/1 <br /> * 100 is the optimum value for a spike recovery. <br /> ** RPD is "Relative Percent Difference" , which is defined as <br /> the difference of two values divided by their mean, expressed <br /> as a percentage. <br /> Western Environmental <br /> Science&Technology <br /> 1046 Olive Orive Suite 3 <br /> Davis CA 95616 <br /> 916 753-9500 <br />