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LABORATORY CONTROL SAMPLE <br /> QUALITY CONTROL REPORT <br /> for <br /> Hydrocarbons <br /> Analyzed by: A. Slivkoff Reviewed by: G. Rodrigo <br /> Sample Matrix: Soil Spiked Sample ID: -Spiking Soil <br /> Twining Laboratories, Inc. Examination Number: 700- 7208.3 GAS ONLY and 7208.8 <br /> FrflResult <br /> Method LCS LCS LCS LCS LCS RPD <br /> Blank Expected Result Dup. % Rec Dup. oda <br /> Conc. (mglkg) Result % Rec. <br /> m f k ) (mg/kg) (m /k } <br /> Benzene ND 0.05 .045 .043 90.0 86.0 4.5 <br /> Toluene :::N:D:::d 0.05 .043 .044 86.0 88.0 2.3 <br /> Ethylbenzene ND 0.05 .043 .043 86.0 86.0 0 <br /> Xylenes ND 0.15 .136 .133 90.7 88.7 2.2 <br /> TPH-Gasoline Range ND 2.5 1.99 2.01 79.6 80.4 1.0 <br /> MTBE ND 0.25 .252 .256 101:j <br /> 102 1.6 <br /> EXPLANATIONS: <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(LCS): A laboratory control sample is generated by spiking the analyte into a <br /> relatively inert matrix (clean sand or blank water). The laboratory control <br /> sample is analyzed exactly like a sample, and its purpose is to determine <br /> whether the methodology is in control and whether the laboratory is <br /> capable of making accurate and precise measurements. <br /> RPD: Relative Percent Difference. <br /> ND: None Detected <br /> Dup: Duplicate <br /> TPH: Total Petroleum Hydrocarbons <br /> m /k : milligrams per kilogram (parts per million) <br /> Rev. 4 4/97 <br /> (QCBTEX.S01) <br />