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• <br /> QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 3269 <br /> Accuracy and Precision, Water: <br /> Analysis I Spike e ove ies* RPD** <br /> Benzene SAMPLE CONTAINED BENZENE--NO SPIKE RECOVERY <br /> Toluene 106 ,110 4% <br /> Ethyl Benzene 104 ,110 6% <br /> Xylenes 100 ,100 0% <br /> TPH as Gasoline 73 , 80 9% <br /> TPH as Diesel 92 ,98 6% <br /> Blank, Water: <br /> Analysis Measured Value <br /> Benzene < . 5 ug/1 <br /> Toluene < . 5 ug/1 <br /> Ethylbenzene <. 5 ug/l <br /> Xylenes <. 5 ug/1 <br /> TPH as Gasoline <50 ug/1 <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 /> 0 <br /> Western Environmental <br /> Science&Technology <br /> 1046 Olive Drive Suite 3 <br /> Davis CA 95616 <br /> 916 753-9500 <br />