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Report Number 28294 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 9/10/2002 <br /> Project Name T&T TRUCKING <br /> Protect Number 21417-001 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup Sample Sample Analysis Date Percent Percent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 28315-04 063 378 394 378 385 ug/L EPA 8260B 911102 98 2 96 2 2 01 70-130 25 <br /> Toluene 28315-04 <0 50 378 394 362 370 ug/t_ EPA 8260B 911102 956 939 1 87 70-130 25 <br /> Tert-Butanol 28315-04 110 189 197 296 307 ug/L EPA 8260B 911102 966 98 3 1 72 70-130 25 <br /> Methyl-t-Butyl Ether 28315-04 240 378 39 4 279 263 ug/L EPA 8260B 911102 112 675 496 70-130 25 <br /> Benzene 28297-02 <0 50 400 400 356 358 ug/L EPA 8260B 8130102 890 896 0 588 70-130 25 <br /> Toluene 28297-02 <0 50 400 400 374 371 ug/L EPA 8260B 8130102 934 926 0 806 70-130 25 <br /> Tert-Butanol 28297-02 <50 200 200 209 201 ug/L EPA 82608 8130102 104 101 3 64 70-130 25 <br /> Methyl-t-Butyl Ether 28297-02 <0 50 400 400 347 344 ug/L EPA 8260B 8130102 868 860 0 925 70-130 25 <br /> 1 <br /> Approved By KIFF ANALYTICAL, LLC By J I Ki <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />