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Report Number 37138 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/24/2004 <br /> Project Name COX * COX <br /> Project Number <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 /> 1,1-Dichloroethane 37089-12 <0 50 400 400 382 381 ug/L EPA 82608 2/23/04 954 952 0 211 70-130 25 <br /> Benzene 37089-12 <0 50 400 400 393 394 ug/L EPA 8260B 2/23104 98 4 985 0188 70-130 25 <br /> 1,2-Dichloroethane 37089-12 <0 50 40 0 400 398 397 ug/L EPA 8260B 2123/04 99 5 992 0 271 70-130 25 <br /> Toluene 37089-12 <0 50 400 400 397 396 ug/L EPA 8260E 2123/04 993 989 0 424 70-130 25 <br /> Chlorobenzene 37089-12 <0 50 40 0 400 38 8 389 ug/L EPA 82606 2123/04 971 972 00349 70-130 25 <br /> Tert-Butanol 37089-12 <5 0 200 200 204 202 ug/L EPA 8260B 2123104 102 101 0 918 70-130 25 <br /> Methyf-t-Butyl Ether 37089-12 28 400 400 691 691 ug/L EPA 8260B 2123/04 101 101 00216 70-130 25 <br /> '04D , J <br /> Approved By IJ I r <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />