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METHODS - 8021 <br />LABORATORY CONTROL SAMPLE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Radu <br />Ms/Msd: 5581.1 <br />Twinina Laboratories. Inc. Examination Number: 699 -5581_.1_ - <br />Reviewed By: J. Peralta <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 />0.139 <br />0.124 <br />111 <br />99.2 <br />28-163 <br />Benzene <br /><0.02 <br />0.125 <br />0.133 <br />0.108 <br />106 <br />86.4 <br />39-150 <br />1,2-Dichloroethane <br /><0.02 <br />0.125 <br />0.133 <br />0.119 <br />106 <br />95.2 <br />51-147 <br />1,1-Dichloroethene <br /><0.02 <br />0.125 <br />0.100 <br />0.082 <br />80.0 <br />65.6 <br />28-167 <br />Carbon Tetrachloride <br /><0.02 <br />0.125 <br />0.126 <br />0.105 <br />101 <br />84.0 <br />43-143 <br />1,1,1 -Trichloroethane <br /><0.02 <br />0.125 <br />0.128 <br />0.107 <br />102 <br />85.641-138 <br />Trichloroethene <br /><0.02 <br />0.125 <br />0.147 <br />0.121 <br />118 <br />96.8 <br />35-146 <br />1,4 -Dichlorobenzene <br /><0.02 <br />0.125 <br />0.137 <br />0.123 <br />110 <br />98.4 <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 />Laboratory Control Sample: A laboratory control sample is generated by spiking the analyte into a relatively inert <br />matrix (clean sand or blank water). The laboratory control sample is analyzed <br />exactly like a sample, and its purpose is to determine whether the methodology is in <br />control and whether the laboratory is capable of making accurate and precise <br />measurements. <br />Mev. z 10/97 1D0CM15MTC901.QQ <br />