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Report Number 25600 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 4/2/2002 - <br /> Project Name GUEVERA <br /> Project Number 3490 <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 25517-04 065 400 400 403 403 ug/L EPA 8260B 3128102 991 991 00252 70-130 25 <br /> Toluene 25517-04 080 400 400 403 400 ug/L EPA 82606 3128102 988 980 0 762 70-130 25 <br /> Teri-Butanol 25517-04 <5 0 200 200 207 202 ug/L EPA 8260B 3128/02 103 101 212 70-130 25 <br /> Methyl4-Butyl Ether 25517-04 <0 50 400 400 345 350 ug/L EPA 8260B 3128102 863 876 147 70-130 25 <br /> I <br /> Benzene 25601-01 <0 50 400 400 398 387 ug/L EPA 8260B 3/30102 994 968 268 70-130 25 <br /> Toluene 25601-01 <0 50 400 400 385 379 ug/L EPA 82606 3130102 962 947 162 70-130 25 <br /> Tert-Butanol 25601-01 <5 0 200 200 204 199 ug/L EPA 8260E 3130102 102 994 244 70-130 25 <br /> Methyl-t-Butyl Ether 25601-01 <0 50 400 400 345 342 ug/L EPA 82606 3130/02 862 855 0 815 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By J �l Kiff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 v <br />