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Report Number 37840 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 4/13/2004 <br /> Project Name 7-Eleven Store #17334 <br /> Project Number 77EL 17334 04 <br /> DuplicaSiked <br /> Duplicate Spiked Spiked to 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 37832-01 <0 50 400 400 419 41 1 ug/L EPA 82608 418104 105 103 1 94 70-130 25 <br /> Toluene 37832-01 <0 50 400 400 416 408 ug/L EPA 82608 418104 104 102 1 97 70-130 25 <br /> Tert-Butanol 37832-01 <5 0 200 200 196 195 ug/L EPA 8260B 418104 980 974 0 675 70-130 25 <br /> Methyl-t-Butyl Ether37832-01 <0 50 400 400 38 2 381 ug/L EPA 8260B 418104 95 6 95 4 0 272 70-130 25 <br /> Benzene 37851-05 <0 50 400 400 406 38 6 ug1L EPA 8260B 419104 101 96 6 4 94 70-130 25 <br /> Toluene 37851-05 <0 50 400 400 38 7 363 ug/L EPA 8260B 419104 96 8 908 629 70-130 25 <br /> Tert-Butanol 37851-05 <5 0 200 200 207 202 ug/L EPA 8260B 419104 104 101 260 70-130 25 <br /> Methyl-t-Butyl Ether 37851-05 <0 50 400 400 38 6 39 6 ug/L EPA 8260B 419104 965 98 9 243 70-130 25 <br /> i <br /> l <br /> Approved By Je � h � <br /> KIFF ANALYTICAL, LLC { <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800 �J <br />