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METHODS - 8021 <br />MATRIX SPIKE / MATRIX SPIKE DUPLICATE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Radu Reviewed By: J. Peralta <br />Twinina LahoratnriPs. Inc. Examinatinn Namhar- R90PiFiiR1.1-7 <br />Constituent <br />Method <br />Spike <br />LCS <br />LCS <br />LCS <br />LCS <br />RANGE <br />Blank <br />Level <br />Result <br />Duplicate <br />% Rec <br />Duplicate <br />Result <br />(ug/L) <br />(ug/L) <br />Result <br />% Rec. <br />(ug/L) <br />(u /L) <br />Vinyl Chloride <br /><0.02 <br /><0.125 <br />0.159 <br />0.141 <br />127 <br />113 <br />28-163 <br />Benzene <br /><0.02 <br /><0.125 <br />0.153 <br />0.147 <br />122 <br />118 <br />39-150 <br />1,2-Dichloroethane <br /><0.02 <br /><0.125 <br />0.175 <br />0.173 <br />140 <br />138 <br />51-147 <br />1, 1 -Dichloroethene <br /><0.02 <br /><0.125 <br />0.143 <br />0.124 <br />114 <br />99.2 <br />28-167 <br />Carbon Tetrachloride <br /><0.02 <br /><0.125 <br />0.145 <br />0.159 <br />116 <br />127 <br />43-143 <br />1,1,1 -Trichloroethane <br /><0.02 <br /><0.125 <br />0.142 <br />0.153 <br />114 <br />122 <br />41-138 <br />Trichloroethene <br /><0.02 <br /><0.125 <br />0.154 <br />0.168 <br />123 <br />134 <br />35-146 <br />1,4 -Dichlorobenzene <br /><0.02 <br /><0.125 <br />0.157 <br />0.159 <br />126 <br />127 <br />42-143 <br />EXPLANATIONS: <br />Method Blank: The method blank is used to determine if method analytes or other interferences are <br />present in the laboratory environment, the reagents or apparatus. <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 />