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Report Number 30101 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 12/9/2002 <br /> Project Name STEFANOS <br /> Project Number <br /> Spiked <br /> Duplicate Spiked Spiked to 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 30114-01 <0 50 399 394 415 41 1 ug/L EPA 8260B 1216102 104 104 0 360 70-130 25 <br /> Toluene 30114-01 <0 50 39 9 394 414 404 ug/L EPA 8260B 1216102 104 102 1 21 70-130 25 <br /> Tert-Butanol 30114-01 <50 200 197 197 204 ug/L EPA 8260B 1216102 988 103 4 58 70-130 25 <br /> Methyl-t-Butyl Ether 30114-01 <0 50 399 394 378 353 ug/L EPA 8260B 1216102 94 6 894 565 70-130 25 <br /> I <br /> Benzene 30104-06 <0 50 400 400 408 38 7 ug/L EPA 82606 1217102 102 96 8 511 70-130 25 <br /> Toluene 30104-06 <0 50 400 400 398 38 0 ug1L EPA 8260B 1217102 995 951 4 52 70-130 25 <br /> Tert-Butanol 30104-06 <50 200 200 209 206 ug/L EPA 8260B 1217102 104 103 143 70-130 25 <br /> Methyl-t-Butyl Ether 30104-06 3 0 400 400 41 0 402 ug/L EPA 8260B 1217102 951 931 2 15 70-130 25 <br /> I <br /> Approved By J el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />