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Report Number 31068 <br /> QC Report . Matrix Spike/Matrix Spike Duplicate Date 1/30/2003 <br /> Project Name 1313 E. Charter Way, <br /> Project Number 030122-JB2 <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 31069-01 <0 50 399 400 355 351 ug/L EPA 8260B 1125103 890 877 1 50 70-130 25 <br /> Toluene 31069-01 <0 50 399 400 371 362 ug/L EPA 8260E 1125103 929 906 2 51 70-130 25 <br /> Tert-Butanol 31069-01 <5 0 200 200 182 179 ug/L EPA 82608 1125103 91 1 895 182 70-130 25 <br /> Methyl-t-Butyl Ether 31069-01 <0 50 399 400 391 388 ug/L EPA 82606 1125103 97 8 970 0 924 70-130 25 <br /> Benzene 31064-05 <0 50 400 400 38 2 36 9 ug/L EPA 8260E 1124103 955 92 2 3 52 70-130 25 <br /> Toluene 31064-05 <0 50 400 400 345 331 ug/L EPA 8260B 1124103 86 3 828 417 70-130 25 <br /> Tert-Butanol 31064-05 <5 0 200 200 192 194 ug/L EPA 8260B 1124103 961 969 0 818 70-130 25 <br /> Methyl-t-Butyl Ether 31064-05 <0 50 400 400 409 408 ug/L EPA 8260B 1124103 102 102 0 171 70-130 25 <br /> KIFF AN - <br /> Approved By J I Kiff <br /> . ,VICAL, LLC . <br /> 2795 2nd St, Suite 300 vis, CA 95616 530-297-4800 <br />