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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2833 <br /> Accuracy and Precision, Soil : <br /> Analysis Spike Recoveries* RPD** <br /> Benzene 100 , 100 0% <br /> Toluene 100 , 100 0% <br /> Ethyl Benzene 100 , 100 0% <br /> Xylenes 103 , 103 0% <br /> TPH as Gasoline 100 , 103 3% <br /> TPH as Diesel 103 , 89 15% <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 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 95676 <br /> 916 753 9500 <br />