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LABORATORY CONTROL SAMPLE <br /> QUALITY CONTROL REPORT <br /> for <br /> BTEX/TPH-G asolin e/TPH-Diesel <br /> Analyzed by: A. Iknoian• C. Fre Reviewed by: C. Loukas <br /> Sample Matrix: Soil Spiked Sample ID: Spiking Soil <br /> QC Sample ID: 1227 S-BTEX 1227 S-TPHG-Range 1226 S-TPHD-Range <br /> Twining Laboratories, Inc. Examination Number: 696-7995.2-8 (BTEXIGasoline/Diesel)__ <br /> Constituent Method LCS LCS LCS LCS LCS RPD <br /> Blank Expected Result Dup. % Rec Dup. % <br /> Result Conc. (mg/kg) Result % Rec. <br /> (mg/kg) (mg/kg) (mglkg) <br /> Benzene <0.005 0.05 0.037 0.035 74.0 70.0 5.6 <br /> Toluene <0.005 0.05 0.043 0.040 86.0 80.0 7.2 <br /> Ethylbenzene <0.005 0.05 0.045 0.042 90.0 84.0 6.9 <br /> Xylenes <0.005 0.15 0.14 0.12 93.0 80.0 15 <br /> TPH-Gasoline <1'0 2.5 2.13 1 .92 85.2 76.8 9.9 <br /> TPH-Diesel Range <1 0 25 18.1 18.5 72.4 74.0 2.2 <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/kg: Milligrams per kilogram (parts per million). <br /> Rev. 3 8104 <br /> (QC8TEXG0.S01U <br />