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9 9 Report Number 190 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 04/24/01 <br /> Project Name 420 W. Kettleman Lane, <br /> Project Number 243-1346 <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 /> Spike Recovery Data <br /> Benzene 19928-01 <0 0050 00498 00496 00501 00440 mg/Kg EPA 8260B 04/13/01 101 887 126 70-130 25 <br /> Toluene 19928-01 <0 0050 00498 00496 00474 00415 mg/Kg EPA 8260B 04/13/01 951 83 7 127 70-130 25 <br /> Tert-Butanol 19928-01 <0 0050 00498 00496 00403 00420 mg/Kg EPA 8260E 04/13/01 809 846 447 70-130 25 <br /> Methyl-t-Butyl Ether 19928-01 <0 0050 00498 00496 00455 00536 mg/Kg EPA 8260B 04/13/01 914 108 16 7 70-130 25 <br /> I <br /> A 1 Kiff <br /> KIFF ANALYTICAL, LLC Approved By J� <br /> I <br />