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4 <br /> Report Number 33405 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date 06/16/2003 <br /> Project Name 440 W. Charter Way, <br /> Project Number 030529-JB-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 /> Parameter Sample Value Level Level Value/ Value Units Method Analyzed Recov Recov Diff Limit Lima <br /> Benzene 33462-08 <0 50 400 400 425 41 7 ug/L EPA 82606 616103 106 104 2 04 70-130 25 <br /> Toluene 33462-08 <0 50 400 400 419 422 ug1L EPA 8260B 616103 105 106 0 666 70-130 25 <br /> Tert-Butanol 33462-08 <5 0 200 200 204 208 ug/L EPA 82606 616103 102 104 229 70-130 25 <br /> Methyl-t-Butyl Ether 33462-08 25 400 400 I 639 639 ug/L EPA 82606 616/03 975 976 00512 70-130 25 <br /> Benzene 33508-03 <0 50 400 400 {' 425 41 7 ug/L EPA 8260B 616103 106 104 2 04 70-130 25 <br /> Toluene 33508-03 <0 50 400 400 42 8 410 ug1L EPA 8260B 616103 107 102 413 70-130 25 <br /> Tert-Butanol 33508-03 <5 0 200 200 206 198 ug/L EPA 8260B 616103 103 98 8 410 70-130 25 <br /> I if <br /> Methyl-t-Butyl Ether 33508-03 <0 50 400 400 409 394 ug/L EPA 8260B 616103 102 984 379 70-130 25 <br /> I � <br /> Approved By J I <br /> OV <br /> KIFF AN /CAL, LLC <br /> 27952nd St, Suite 30 vis, CA 95616 530-297-4800 <br /> 1 4 1 <br />