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0 • Report Number 04 <br /> QC Report • Matrix Spike/Matrix Spike Duplicate Date 12/18/01 <br /> Project Name 6131 Pacific Ave., <br /> Project Number 011210-KF-1 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike SpikedSpiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike <br /> DUD 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 23824-10 <0 50 498 498 51 3 504 ug/L EPA 8260E 12/16/01 103 101 1 69 70-130 25 <br /> Toluene 23824.10 <0 50 4Q 8 498 517 51 1 ug/L EPA 8260B 12/16/01 104 103 114 70-130 25 <br /> Tert-Butanol 23824-10 <5 0 249 249 270 260 ug/L EPA 8260B 12/16/01 108 104 378 70-130 25 <br /> Methyl-t-Butyl Ether 23824-10 <0 50 498 49 8 455 452 ug/L EPA 8260B 12/16/01 914 909 0 548 70-130 25 <br /> Benzene 23771-10 <0 50 400 400 428 422 ug/i_ EPA 82606 12/15/01 107 106 143 70-130 25 <br /> Toluene 23771-10 <0 50 400 400 434 427 ug/L EPA 8260B 12/15/01 108 107 167 70-130 25 <br /> Tent-Butanol 23771-10 620 200 200 828 814 ug/L EPA 8260E 12/15/01 103 958 721 70-130 25 <br /> Methyl-t-Butyl Ether 23771-10 100 400 400 151 148 ug/L EPA 82606 12/15/01 114 108 4 75 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By J 1 Kiff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br /> I <br />