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I • <br /> = 4r <br /> Report Number 28215 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 913!2002 <br /> Project Name STOCKTON SJCC <br /> Project Number SJCC <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 28215-01 <0 50 400 400 381 376 ug/L EPA 8260E 8/27102 953 94 0 140 70-130 25 <br /> Toluene 28215-01 <0 50 400 400 379 370 ug/L. EPA 8260B 8127102 94 8 92 6 237 70-130 25 <br /> Tert-Butanol 28215-01 <5 0 200 200 207 197 ug/L EPA 8260B 8127102 103 987 4 57 70-130 25 <br /> Methyl-t-Butyl Ether 28215-01 <0 50 400 400 402 41 1 uglL EPA 8260B 8127/02 101 103 2 21 70-130 25 <br /> Benzene 28254-08 <0 50 400 400 394 387 uglL EPA 8260B 8130102 98 6 968 1 89 70-130 25 <br /> Toluene 28254-08 <0 50 400 400 405 404 ug/L EPA 82608 8130102 101 101 0 297 70-130 25 <br /> Tert-Butanol 28254-08 <50 200 200 199 206 ug/L EPA 82606 8/30102 997 103 317 70-130 25 <br /> Methyl-t-Butyl Ether 28254-08 0 51 400 400 406 39 2 ug/L EPA 8260B 8130102 100 966 3 58 70-130 25 <br /> � f I <br /> Approved By J el Kiffl <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite 0 Davis, CA 95616 530-297-4800 <br />