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Report Number 39626 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8/19/2004 <br /> Project Name 7-Eleven Store #32262 <br /> Project Number 77EL 32262 04 <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 39653-08 <0 50 400 400 402 388 ug/L EPA 8260B 8118104 100 970 3 56 70-130 25 <br /> Toluene 39653-08 <0 50 400 400 393 372 ug/L EPA 8260B 8118104 983 930 559 70-130 25 <br /> Tert-Butanol 39653-08 5 5 200 200 201 198 ug/L EPA 8260B 8118104 977 96 0 1 71 70-130 25 <br /> Methyl-t-Butyl Ether 39653-08 60 400 400 95 3 962 ug/L EPA 8260B 8118104 88 9 91 0 2 31 70-130 25 <br /> Benzene 39675-05 <0 50 400 400 397 394 ug/L EPA 8260B 8/18104 99 2 98 5 0 716 70-130 25 <br /> Toluene 39675-05 <0 50 400 400 402 39 7 ug/L EPA 8260B 8118/04 100 99 3 126 70-130 25 <br /> Tert-Butanol 39675-05 <5 0 200 200 193 198 ug/L EPA 82606 8118104 965 991 2 65 70-130 25 <br /> Methyl-t-Butyl Ether 39675-05 <0 50 400 400 38 5 390 ug/L EPA 82606 8118/04 962 976 146 70-130 25 <br /> 4 <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 <br />