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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 3183 <br /> Accuracy and Precision, Soil : <br /> Analysis Spike_ Recoveries* RPD** <br /> Benzene 92, 94 2% <br /> Toluene 98,96 2% <br /> Ethyl Benzene 94 ,96 20 <br /> Xylenes 87 ,93 7% <br /> TPH as Gasoline 110, 110 0% <br /> TPH as Diesel 98 , 100 20 <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 <10 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 /> 916 753-8500 <br />