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Quality Control Report <br /> for <br /> Hydrocarbons (BTEX, TPH-G, TPH-D) <br /> Analyzed By: S . Singh Reviewed By: Koelewvn <br /> QC Sample ID: 013092 -S-BTEX Spike Level : BTEX 0 . 05 ppm <br /> Sample Matrix: Soil Spiked Sample ID: Spiking Soil <br /> Quality Control Report for Exam Number: 692-0552 . 1-3 <br /> Matrix <br /> Method Matrix Spike <br /> Constituent Blank Spike P� Dup Spike <br /> (mg/kg) (% Rec) (% Rec) Range <br /> Benzene ND 104 106 2 <br /> Toluene ND 89 117 28 <br /> Ethylbenzene ND 95 96 1 <br /> Xylenes ND 108 108 0 <br /> Method Blank: A method blank demonstrates the presence or <br /> absence of contamination in the analytical <br /> procedure. <br /> Matrix Spike and Matrix Spike Duplicate: A matrix spike is a <br /> sample to which a known amount of analyte has been added. <br /> The percent recovery and percent recovery difference of <br /> the matrix spike and the matrix spike duplicate are <br /> analyzed to measure the accuracy and precision of the <br /> analytical procedure. <br /> NOTES: <br /> ND : None Detected <br /> Fresno Modesto Visalia Bakersfield <br />