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QUALITY CONTROL DATA PERTAINING TO SAMPLE LOG 2819 <br /> Accuracy and Precision, Soil: <br /> Analysis a Spike Re ovgries* P�** <br /> Benzene 1.00 ,100 0% <br /> Toluene 110 ,100 10% <br /> Ethyl Benzene 110 ,110 0% <br /> Xylenes 113 ►11.3 0% <br /> TPH as Gasoline 90 , 83 8% <br /> TPH as Diesel 103 ,105 2% <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 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 /> 1046 Olive Drive,Suite 3 <br /> Davis CA 95616 <br /> 976 753 9500 <br />