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Report Number 33233 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date 7/7/2003 <br /> Project Name 2494 Fremont Street, <br /> Project Number 030514-JB1 <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 33236-02 <5 0 200 200 184 199 ug/L EPA 82608 5122103 921 995 775 70-130 25 <br /> Methyl-t-Butyl Ether 33236-02 <0 50 400 400 38 2 36 7 ug/L EPA 8260B 5122/03 956 91 8 400 70-130 25 <br /> Benzene 33249-01 <0 50 400 400 394 378 ug/L EPA 82608 5/22103 985 944 420 70-130 25 <br /> Toluene 33249-01 <0 50 400 400 414 399 ug/L EPA 8260B 5/22103 104 998 3 71 70-130 25 <br /> Tert-Butanol 33249-01 <5 0 200 200 209 200 ug/l. EPA 82606 5122103 105 998 472 70-130 25 <br /> Methyl-t-Butyl Ether 33249-01 <0 50 400 400 370 374 ug/L EPA 8260B 5122103 92 5 935 108 70-130 25 <br /> i <br /> KIFF AN ICAL, LLC Approved By J I Kiff , <br /> 2795 2nd St, Suite 3Q0�is, CA 95616 530-297-4800 • <br />