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MATRIX SPIKE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Radu Reviewed By: J. Peralta <br />Sample Matrix: Soil Method: 8021 <br />Twininq Laboratories, Inc. Examination Number: 699-5996.1-5 <br />Constituent <br />MB <br />Result <br />Spike <br />Level <br />MS <br />Result <br />MSD <br />Result <br />MS % <br />Rec. <br />MSD% <br />Rec. <br />RPD <br />VINYL CHLORIDE <br /><0.5 <br />0.125 <br />0.132 <br />0.135 <br />106 <br />108 <br />80-120 <br />BENZENE <br /><0.5 <br />0.125 <br />0.12 <br />0.121 <br />96.8 <br />96.8 <br />80-120 <br />1,2-DICHLOROETHANE <br /><0.5 <br />0.125 <br />0.137 <br />0.142 <br />110 <br />114 <br />80-120 <br />1,1-DICHLOROETHENE <br /><0.5 <br />0.125 <br />0.125 <br />0.126 <br />100 <br />101 <br />80-120 <br />CARBON TETRACHLORIDE <br /><0.5 <br />0.125 <br />0.127 <br />0.125 <br />102 <br />100 <br />80-120 <br />1,1,1 -TRICHLOROETHANE <br /><0.5 <br />0.125 <br />0.133 <br />0.132 <br />106 <br />106 <br />j 80-120 <br />TRICHLOROETHENE <br /><0.5 <br />0.125 <br />0.121 <br />0.121 <br />96.8 <br />96.8 <br />80-120 <br />1,4 -DICHLOROBENZENE <br /><0.5 <br />0.125 <br />0.109 <br />0.106 <br />87.2 <br />84.8 <br />80-120 <br />EXPLANATIONS: <br />Method Blank: The method blank is used to determine if method analytes or other interferences are present in the <br />laboratory environment, the reagents or apparatus. <br />All concentrations in mg/Kg: Milligrams per kilogram (ppm) <br />Matrix Spike and <br />Matrix Spike Duplicate: A matrix spike is a sample to which a known amount of analyte has been added. <br />The percent recovery and the relative percent difference are assessed to determine <br />the accuracy and precision of the analytical procedure. <br />nev. E °9/9 <br />