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LABORATORY CONTROL SAMPLE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Rau Reviewed By: J. Peralta <br />Method: 8021 Sample Matrix: Soil <br />Twinlnq Laboratories. Inc. Examinatinn N//mhar• C,QQ-FQQR t_G <br />Constituent <br />MB <br />Result <br />Spike <br />Level <br />LCS <br />Result <br />LCSD <br />I Result <br />LCS <br />% Ree <br />LCSD <br />% Rec. <br />RANGE <br />VINYL CHLORIDE <br /><0.5 <br />0.125 <br />0.148 <br />0.148 <br />118 <br />118 <br />80-120 <br />BENZENE <br /><0.5 <br />0.125 <br />0.146 <br />0.139 <br />117 <br />111 <br />80-120 <br />1,2-DICHLOROETHANE <br /><0.5 <br />0.125 <br />0.138 <br />0.141 <br />110 <br />113 <br />80-120 <br />1,1-DICHLOROETHENE <br /><0.5 <br />0.125 <br />0.144 <br />0.145 <br />115 <br />116 <br />80-120 <br />CARBON TETRACHLORIDE <br /><0.5 <br />0.125 <br />0.132 <br />0.147 <br />106 <br />118 <br />80-120 <br />1,1,1 -TRICHLOROETHANE <br /><0.5 <br />0.125 <br />0.124 <br />0.147 <br />99.2 <br />118 <br />80-120 <br />TRICHLOROETHENE <br /><0.5 <br />0.125 <br />0.143 <br />0.143 <br />114 <br />114 <br />80-120 <br />1,4 -DICHLOROBENZENE <br /><0.5 <br />0.125 <br />0.134 <br />0.130 <br />107 <br />104 <br />80-120 <br />EXPLANATIONS: <br />All concentrations in mg/Kg: Milligrams per kilogram (ppm) <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 />8.v. 3 05/97 IOC.WKSI <br />