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Report Number 31774 <br /> QC Report . Matrix Spike!Matrix Spike Duplicate Date 3/10/2003 <br /> Project Name 7910 Lower Sacramento <br /> Project Number 030221-MS-2 <br /> Duplicate Spiked <br /> Duplicate Spiked Sprked Sample Relative <br /> Spike Spiked Spiked Sample SampleRelative 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 31772-01 <0 50 400 400 405 402 ug/L EPA 82608 311103 101 100 0 868 70-130 25 <br /> Toluene 31772-01 <0 50 400 400 382 378 ug/L EPA 8260B 311103 954 946 0 816 70-130 25 <br /> Tert-Butanol 31772-01 <5 0 200 200 196 195 ug/L EPA 8260B 311103 97 9 97 4 0 604 70-130 25 <br /> Methyl-t-Butyl Ether 31772-01 <0 50 400 400 351 354 ug/L EPA 82606 3!1103 878 884 0 624 70-130 25 <br /> Benzene 31774-01 <0 50 400 400 373 357 ug/L EPA 8260B 311103 932 89 2 4 41 70-130 25 <br /> Toluene 31774-01 <0 50 400 400 364 34 5 ug/L EPA 8260B 311103 910 86 2 547 70-130 25 <br /> Tert-Butanol 31774-01 87 200 200 202 200 ug/L EPA 8260E 311103 964 959 0 489 70-130 25 <br /> Methyl-t-Butyl Ether 31774-01 13 400 400 506 505 ug/L EPA 82606 311103 944 94 0 0 318 70-130 25 <br /> I <br /> KIFF AN YTICAL, LLC Approved By J 1 Krff <br /> 2795 2nd St, Suite 30r vis, CA 95616 530-297-4800 <br />