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r■� rs r r■i r� �■■ ar M r r41r <br /> Report Number 24620 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/12/2002 <br /> Project Name STEFANOS <br /> Project Number <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 24620-01 <0 50 192 187 190 182 uglL EPA 82606 2/8/2002 98 8 974 143 70-130 25 <br /> Toluene 24620-01 <0 50 192 187 185 180 ug/L EPA 82608 2/8/2002 965 960 0 442 70-130 25 <br /> Tert-Butanol 24620-01 <5 0 960 93 7 102 98 6 ug/L EPA 82606 2/8/2002 106 105 0 738 70-130 25 <br /> Methyl-t-Butyl Ether 24620-01 <0 50 192 187 189 161 ug/L EPA 8260E 2/8/2002 98 3 86 1 132 70-130 25 <br /> Approved By J6el Kiff <br /> KIFF ANALYTICAL, LLC !� <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />