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• <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2805 <br /> Accuracy and Precision, Soil: <br /> Analysis SIDI e Recoveries* RPD** <br /> Benzene 100 , 90 10% <br /> Toluene 95 , 87 8% <br /> Ethyl Benzene 93 ,93 0% <br /> Xylenes 93 , 93 0% <br /> TPH as Gasoline 107 ,100 7% <br /> TPH as Diesel 94,96 2% <br /> Blank, Soil: <br /> Analysis Measured Value <br /> Benzene - <. 005 mg/kg <br /> Toluene <.005 mg/kg <br /> Ethylbenzene <. 005 mg/kg <br /> Xylenes <. 005 mg/kg <br /> . TPH as Gasoline <.5 mg/kg <br /> TPH as Diesel <10 mg/kg <br /> * 100 is the optimum value for a spike recovery. <br /> ** RPD is "Relative Percent Difference" , which as defined as <br /> the difference of two values divided by their mean, expressed <br /> as a percentage. <br /> Western Environmental <br /> Science&Technology <br /> 1446 Olive Drive Suite 3 <br /> Davis CA 95616 <br /> 9167639500 <br />