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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 3614 <br /> Accuracy and Precision, Water: <br /> Analysis $ Spike Recoveries* RPD** <br /> Benzene 130 ,90 36% <br /> Toluene 124 ,96 25% <br /> Ethyl Benzene 124 ,96 25% <br /> Xylenes 133 ,100 28% <br /> TPH as Gasoline 100 ,97 3% <br /> TPH as Diesel 91,95 4% <br /> Blank, Water: <br /> Analysis Measured Value <br /> Benzene <. 5 ug/1 <br /> Toluene <.5 ug/l <br /> Ethylbenzene <. 5 ug/l <br /> . Xylenes <. 5 ug/l <br /> TPH as Gasoline <50 ug/l <br /> TPH as Diesel <50 ug/1 <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 />