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P, <br /> 40ALO=� <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2788 <br /> Accuracy and Precision, Soil: <br /> Analysis % Spike Recoveries* RPD** <br /> Benzene 86 ,94 9% <br /> Toluene 79,85 7% <br /> Ethyl Benzene 69,82 17% <br /> Xylenes 63 ,77 20% <br /> TPH as Gasoline 70 , 67 4% <br /> TPH as Diesel 98, 98 0% <br /> Blank, Soil: <br /> nal is 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 8 Technology <br /> 1048 Olive Drive Suite 3 <br /> Davis CA 95616 <br /> 916 753-9500 <br />