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Report Number 27132 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6126/02 <br /> Project Name Chevron 9-57751301 W. <br /> Project Number 77CH 95775.00.0550 <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 27407-02 <0 50 400 400 367 357 ug/L EPA 82608 6125102 918 892 2 82 70-130 25 <br /> Toluene 27107-02 065 400 400 370 359 ug/L EPA 8260B 6125102 91 0 88 2 313 70-130 25 <br /> Tert-Butanol 27107-02 <5 0 200 200 173 177 ug/L EPA 8260E 6125102 86 5 885 226 70-130 25 <br /> Methyl-t-Butyl Ether 27107-02 <0 50 400 400 388 379 ug/L EPA 8260B 6125102 97 0 948 2 37 70-130 25 <br /> I <br /> I <br /> Approved By J6el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 U <br />