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i i ! <br /> Report Number 25851 <br /> QC Report• Matrix Spike/Matrix Spike Duplicate Date 4/11/2002 <br /> Project Name CHEVRON 9-57751301 W. <br /> Project Number 77CH.43452.00.0550 <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 25831-02 <0 50 400 400 448 438 ug/L EPA 8260B 419102 112 110 210 70-130 25 <br /> Toluene 25831-02 <0 50 400 400 447 431 uglL EPA 8260B 419102 112 108 360 70-130 25 <br /> Tert Butanol 25831-02 <5 0 200 200 206 209 ug/L EPA 8260E 419102 103 105 `143 70-130 25 <br /> Methyl-t Butyl Ether 25831-02 <0 50 40 0 400 455 452 ug/L EPA 8260B 419102 114 113 0 661 70-130 25 <br /> � I <br /> ' I <br /> Approved By J I riff <br /> KIFF ANALYTICAL, LLC } <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />