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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2890 <br /> Accuracy and Precision, Soil : <br /> Analysis I Spike Recoveries* RPD** <br /> Benzene 91 ,93 2% <br /> Toluene 90, 94 4% <br /> Ethyl Benzene 90 , 100 10% <br /> Xylenes 93 ,97 4%- <br /> TPH <br /> %TPH as Gasoline 90 ,90 0% <br /> TPH as Diesel 103 ,100 3% <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 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 Enwronmental <br /> Science&Technology <br /> 1046 Olive Drive,Suite 3 <br /> Davrs CA 95616 <br /> 916 753-9500 <br />