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y <br />LABORATORY CONTROL SAMPLE <br />QUALITY CONTROL REPORT <br />Analyzed By: D. Radu Reviewed By: J. Peralta <br />Twining Laboratories, Inc. Examination Number: 69905581.1-2 <br />Constituent <br />MB <br />Result <br />Spike <br />Level <br />LCS <br />Result <br />LCSD <br />Result <br />LCS <br />% Rec <br />LCSD <br />% Rec. <br />RPD <br />BENZENE <br /><0.005 <br />0.05 <br />0.0560 <br />0.0589 <br />112 <br />118 <br />5.0 <br />TOLUENE <br /><0.005 <br />0.05 <br />0.0605 <br />0.0597 <br />121 <br />119 <br />1.3 <br />ETHYLBENZENE <br /><0.005 <br />0.05 <br />0.0627 <br />0.0618 <br />125 <br />124 <br />1.4 <br />XYLENES <br /><0.005 <br />0.15 <br />0.176 <br />0.183 <br />117 <br />122 <br />3.9 <br />MTBE <br /><0.05 <br />0.25 <br />0.272 <br />0.265 <br />109 <br />106 <br />2.6 <br />TPH-GASOLINE <br />< 1.0 <br />2.5 <br />2.62 <br />2.56 <br />105 <br />102 <br />2.3 <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 />Rev. 3 05/87 (QC.WKS) <br />