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i • • <br /> Report Number 31087 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 1130/03 <br /> Pro)ect Name 2575 Country Club Blvd. <br /> Project Number 245-0783 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Duo 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 39 9 400 35 5 351 ug/L EPA 8260B 1125/03 890 877 1 50 70-130 25 <br /> Toluene 31069-01 <0 50 399 400 371 362 ug1L EPA 82608 1125103 929 906 251 70-130 25 <br /> Tert-Butanol 31069-01 <5 0 200 200 182 179 ug1L EPA 8260B 1125103 91 1 89 5 1 82 70-130 25 <br /> Methyl-t-Butyl Ether 31069-01 <0 50 399 400 391 388 ug/L EPA 82608 1125103 97 8 970 0 924 70-130 25 <br /> Benzene 31064-05 <0 50 400 400 382 369 ug/L EPA 8260B 1124103 95 5 922 352 70-130 25 <br /> Toluene 31064-05 <0 50 400 400 345 331 ug/L EPA 8260B 1124103 863 828 417 70-130 25 <br /> Tert-Butanol 31064-05 <5 0 200 200 192 194 ug& EPA 8260B 1124103 961 969 0 818 70-130 25 <br /> Methyl-t-Butyl Ether 31064-05 <0 50 400 400 409 408 ug& EPA 8260B 1124103 102 102 0171 70-130 25 <br /> f, <br /> Approved By JI Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />