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Report Number 39451 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8/5/2004 <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 39447-04 <0 50 400 400 398 385 ug/L EPA 82608 813104 996 964 329 70-130 25 <br /> Toluene 39447-04 <0 50 400 400 388 384 ug/L EPA 8260E 813104 971 959 1 26 70-130 25 <br /> Tert-Butanol 39447-04 <5 0 200 200 212 208 ug/L EPA 82606 813104 106 104 1 81 70-130 25 <br /> Methyl-t-Butyl Ether 39447-04 570 400 400 598 587 ug/L EPA 8260E 813104 720 442 479 70-130 25 <br /> I <br /> Benzene 39451-07 <0 50 400 400 391 381 ug/L EPA 82606 814104 977 954 245 70-130 25 <br /> Toluene 39451-07 <0 50 400 400 397 391 ug/L EPA 82606 814/04 993 977 1 58 70-130 25 <br /> Tert-Butanol 39451-07 <5 0 200 200 212 211 ug/L EPA 8260B 814104 106 106 0 413 70-130 25 <br /> Methyl-t-Butyl Ether 39451-07 <0 50 400 400 382 374 ug/L EPA 8260B 814104 954 935 1 95 70-130 25 <br /> Approved By JoCiff <br /> KIFF ANALYTICAL, LLC <br /> f 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />