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i i ! <br /> Report Number 27506 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 7/21/2002 <br /> Protect Name MACK <br /> Protect 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 27499-01 <0 50 39 7 399 400 398 ug/L EPA 82608 7119102 101 997 0 973 70-130 25 <br /> Toluene 27499-01 <0 50 397 399 41 5 41 4 ug1L EPA 8260B 7119102 104 104 0 865 70-130 25 <br /> Tert-Butanol 27499-01 <5 0 198 200 191 193 ug/L EPA 82606 7119102 96 4 96 6 0 150 70-130 25 <br /> Methyl-t-Butyl Ether 27499-01 <0 50 397 399 38 8 39 1 ug/L EPA 8260B 7119102 979 97 9 00511 70-130 25 <br /> I <br /> Approved By Joel Kiff Y <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />