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Report Number 32174 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 3/24/2003 <br /> i <br /> Project Name 7-Eleven Store #21756 <br /> Project Number 77EL 21756 03 <br /> I <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 32197-01 <0 50 398 400 381 376 uglL EPA 8260B 3120103 95 7 94 0 1 79 70-130 25 <br /> Toluene 32197-01 069 39 8 400 400 39 4 uglL EPA 8260B 3120103 98 7 96 7 2 04 70-130 25 <br /> Tert-Butanol 32197-01 <5 0 199 200 190 192 uglL EPA 82606 3120103 955 962 0 688 70-130 25 <br /> Methyl-t-Butyl Ether 32197-01 <0 50 398 400 421 422 uglL EPA 82606 3120103 106 106 0 142 70-130 25 <br /> Benzene 32174-02 <0 50 400 400 41 7 401 uglL EPA 8260B 3119103 104 100 3 91 70-130 25 <br /> Toluene 32174-02 <0 50 400 400 424 408 uglL EPA 8260B 3119103 106 102 377 70-130 25 <br /> Tert-Butanol 32174-02 <50 200 200 210 224 ug/L EPA 8260B 3119103 105 112 6 09 70-130 25 <br /> Methyl-t-Butyl Ether 32174-02 41 400 400 422 41 5 uglL EPA 8260B 3119103 952 934 186 70-130 25 <br /> Approved By Jbel Kiff <br /> KIFF ANALYTICAL, LLC 1 <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />