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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 /> Constituent Method LCS LCS LCS LCSLCS RPD <br /> Blank Expected Result Dup. % Rec Dup. % <br /> Result Conc. (mg/kg) Result % Rec. <br /> (m /k ) (mg/kg) (mg/kg) <br /> Benzene ND 0.05 .045 .043 90.0 86.0 4.5 <br /> Toluene ND 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 .256 101 102 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 : milli rams per kilo ram (parts per million) <br /> Rev. 4 4197 <br /> (0CBTEX.S01) <br />