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Report Number 250 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 04/26/2002 <br /> Project Name 4315 Waterloo Road, <br /> Project Number 020418-DW-1 <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 /> _ p „ „ _ Analyzed v Doff Limit Limit <br /> Parameter Sample Value Level Level Value Value Units Method Anal ed Reco Recov Do <br /> _ <br /> Benzene 25998-01 <0 50 400 400 380 373 ug/L EPA 8260E 4121102 95 0 932 189 70-130 25 <br /> Toluene 25998-01 <0 50 400 400 384 378 ug/L EPA 8260B 4121/02 960 94 6 142 70-130 25 <br /> Tert-Butanol 25998-01 <5 0 200 200 197 192 ug/L EPA 8260B 4121102 98 5 95 9 264 70-130 25 <br /> Methyl-t-Butyl Ether 25998-01 <0 50 400 400 361 349 ug/L EPA 8260B 4121102 902 874 326 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By J I Kiff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-2974800 <br />