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LABORATORY CONTROL SAMPLE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Radu Reviewed By: J. Peralta <br />Twinina Laboratories. Inc. Examination Number: 69905996.1-5 <br />Constituent <br />MB <br />Result <br />Spike <br />Level <br />LCS <br />Result <br />LCSD <br />Result <br />LCS <br />% Rec <br />LCSDRPD <br />% Rec. <br />BENZENE <br /><0.005 <br />0.05 <br />0.0482 <br />0.0501 <br />96.4 <br />100 <br />3.9 <br />TOLUENE <br /><0.005 <br />0.05 <br />0.0561 <br />0.0567 <br />112 <br />113 <br />1.1 <br />ETHYLBENZENE <br /><0.005 <br />0.05 <br />0.0568 <br />0.0558 <br />114 <br />112 <br />1.8 <br />XYLENES <br /><0.005 <br />0.15 <br />0.170 <br />0.173 <br />113 <br />115 <br />1.7 <br />MTBE <br /><0.05 <br />0.25 <br />0.212 <br />0.210 <br />84.9 <br />84.1 <br />0.95 <br />TPH-GASOLINE <br /><1.0 <br />2.5 <br />2.87 <br />2.79 <br />115 <br />112 <br />2.8 <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 <br />interferences are present in the laboratory environment, the reagents or <br />apparatus. <br />Laboratory Control Sample: A laboratory control sample is generated by spiking the analyte <br />into a relatively inert matrix (clean sand or blank water). The <br />laboratory control sample is analyzed exactly like a sample, and <br />its purpose is to determine whether the methodology is in <br />control and whether the laboratory is capable of making accurate <br />and precise measurements. <br />Rev. 3 05197 (QC.WKS) <br />