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LABORATORY CONTROL SAMPLE <br /> QUALITY CONTROL REPORT <br /> for <br /> Hydrocarbons <br /> Analyzed by: A. Slivkoff Reviewed by: G. Rodri o <br /> Sample Matrix: Soil Spiked Sample ID: Spiking Soil <br /> Twining Laboratories, Inc. Examination Number: 700- 7208.1-8 <br /> Constituent Method LCS LCS LCS LCS 7up. <br /> RPD <br /> Blank Expected Result Dup. % Rec <br /> Result Conc. (mg/kg) Result <br /> (mg/kg) (mg/kg) (mg/kg) <br /> Benzene ND 0.05 .047 .045 94.0 90.0 4.3 <br /> Toluene ND 0.05 .045 .044 90.0 88.0 2.2 <br /> Ethylbenzene ND 0.05 .045 .045 90.0 90.0. 0 <br /> Xylenes ND 0.15 .134 .133 89.3 88.7 0.75 <br /> TPH-Gasoline Ran a 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 /> m /k : milligrams per kilogram (parts per million) <br /> Rev. 4 4/97 <br /> (OCBTEX.501) <br />