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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- 7208.1-8 <br /> ------------------- <br /> Constituent Method LCS LCS ]ult <br /> LCS LCS RPD <br /> Blank Expected Result % Rec Du <br /> Result Conc. Re <br /> (mg/kg] % Rec. <br /> (m /k ) {m I k ) <br /> Benzene ND 0.05 .047 .045 94.0 90.0 4.3 <br /> Toluene ND 0.05 .045 E.045 <br /> 4 90.0 88.0 2.2 <br /> Ethylbenzene ND 0.05 .045 90.0 90.0, 0 <br /> Xylenes ND 0.15 .134 .133 89.3 88.7 0.75 <br /> TPH-Gasoline Ran2e ND 2.5 2.34 2.28 93.6 91.2 2.6 <br /> MTBE ND 0.25 0.270 .268 108 107 0.74 <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 /> mg/k : milligrams per kilogram (parts per million) <br /> Rev. 4 4197 <br /> (OCETEX.SOq <br />