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f <br /> Report Number 31003 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 1/21/2003 <br /> Protect Name MACK <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 Anal zed Recov Recov Diff Limit Limit <br /> Benzene 31001-01 <0 50 400 400 436 425 ug/L EPA 82606 1120103 109 106 251 70-130 25 <br /> Toluene 31001-01 <0 50 400 400 41 6 408 ug/L EPA 8260E 1120103 104 102 216 70-130 25 <br /> Tert-Butanol 31001-01 <5 0 200 200 209 210 ug/l_ EPA 8260B 1120103 104 105 0 639 70-130 25 <br /> Methyl-t-Butyl Ether 31001-01 16 400 400 427 425 ug/L EPA 8260B 1120103 103 102 0 366 70-130 25 <br /> KlFF ANALYTICAL, LLC Approved By Jbgl Kiff <br /> 2795 2nd St, Sutte 300 Davis, CA 95616 530-297-4800 V <br /> r <br />