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• <br /> rid E�V <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2798 <br /> Accuracy and Precision, Soil : <br /> Analysis Spike Recoveries* RPD** <br /> Benzene 93 ,88 6% <br /> Toluene 87,86 1% <br /> Ethyl Benzene 86 ,85 1% <br /> Xylenes 87,$7 0% <br /> TPH as Gasoline 117 ,120 3% <br /> TPH as Diesel 99, 100 1% <br /> Blank, Soil : <br /> Analysis Measuged 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 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 Drive Suite 3 <br /> Davis,CA 95616 <br /> 916 753-9500 <br />