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Report Number 33426 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 6!9!2003 <br /> Project Name 7-Eleven Store#14117 <br /> Project Number 77EL.14117.03 <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 /> Tert-Butanol 33426-07 <5 0 200 200 212 212 ug/L EPA 8260B 613103 106 106 0 127 70-130 25 <br /> Methyl-t-Butyl Ether 33426-07 42 400 400 432 434 ug/L EPA 82608 613103 976 979 0 332 70-130 25 <br /> Benzene 33508-03 <0 50 400 400 425 41 7 ug/L EPA 8260B 616103 106 104 204 70-130 25 <br /> Toluene 33508-03 <0 50 400 400 428 410 uglL EPA 8260B 616103 107 102 413 70-130 25 <br /> Tert-Butanol 33508-03 <50 200 200 206 198 ug/L EPA 82606 6!6103 103 98 8 410 70-130 25 <br /> Methyl-t-Butyl Ether 33508-03 <0 50 400 400 409 394 ug/L EPA 8260B 616103 102 984 379 70-130 25 <br /> I <br /> � f <br /> Approved By .lbs I Kiff <br /> KIFF ANALYTICAL, LLC I <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />