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i I <br /> Report Number 24 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 11/12/02 <br /> Project Name 2494 Fremont Street, <br /> Project Number 021028-JB-2 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Reiative 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 29464-02 2 5 200 199 221 21 7 uglL EPA 8260B 1113102 980 968 1 19 70-130 25 <br /> Toluene 29464-02 <0 50 20 0 199 197 193 uglL EPA 8260B 1113102 984 973 1 05 70-130 25 <br /> Tert-Butanol 29464-02 <5 0 100 99 3 107 105 uglL EPA 8260B 1113102 107 106 148 70-130 25 <br /> Methyl-t-Butyl Ether 29464-02 94 200 199 118 112 uglL EPA 8260B 1113102 119 907 271 70-130 25 <br /> Benzene 29452-02 <0 50 400 400 409 398 uglL EPA 8260B 1111102 102 99 4 282 70-130 25 <br /> Toluene 29452-02 <0 50 400 400 425 407 uglL EPA 8260B 1111102 106 102 4 35 70-130 25 <br /> Tert-Butanol 29452-02 <5 0 200 200 211 210 uglL EPA 82606 1111102 106 105 0 702 70-130 25 <br /> Methyl-t-Butyl Ether 29452-02 <0 50 400 400 422 408 ug/L EPA 82606 1111102 105 102 345 70-130 25 <br /> � � I <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />