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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 3329 <br /> Accuracy and Precision, Water: <br /> Analysis Spike Recoveries* EP <br /> Benzene 98 ,94 4% <br /> Toluene 106, 106 0% <br /> Ethyl Benzene 118 ,114 4%- <br /> Xylenes <br /> %Xylenes 113 , 107 6% <br /> TPH as Gasoline 90 , 110 20% <br /> TPH as Diesel 101 ,112 10% <br /> Blank, Water: <br /> Analysjs Measured Value <br /> Benzene <. 5 ug/l <br /> Toluene <.5 ug/l <br /> Ethylbenzene <. 5 ug/l <br /> Xylenes <.5 ug/l <br /> TPH as Gasoline <50 ug/1 <br /> TPH as Diesel <50 ug/l <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 /> 7046 Olive Dave Suite 3 <br /> Davis CA 95616 <br /> 916 753-9500 <br />