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4 <br /> Report Number: 3870 <br /> QC Report : Matrix Spike/ Matrix Spike Duplicate Date -, 612112004 <br /> Project <br /> Name : Former Beacon 12474 <br /> Project Number: 1474.47 <br /> Duplicate Spiked <br /> Duplicate SpikedSpiked 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 38759-03 <0.50 40.0 40.0 39.8 39.8 ug/L EPA 8260B 6116104 99.5 99.6 0.0244 70-130 25 <br /> Toluene 38759-03 <0.50 40.0 40.0 36.4 37.6 ug/L EPA 82606 6116!04 91.1 94.0 3.16 70-130 25 <br /> Tert-Butanol 38759-03 <5.0 200 200 203 208 ug/L EPA 8260E 6116104 101 104 2.68 70-130 25 <br /> I� Methyl-t-Butyl Ether 38759-03 <0.50 40.0 40.0 44.3 45.8 ug/L EPA 8260B 6116104 111 114 3.26 70-130 25 <br /> Benzene 38788-01 <0.50 40.0 40.0 33.2 33.0 ug/L EPA 8260E 6117104 83.1 82.6 0.621 70-130 25 <br /> Toluene 38788-01 <0.50 40.0 40.0 35.2 34.6 ug/L EPA 82606 6117104 88.1 86.4 1.99 70-130 25 <br /> Tert-Butanol 38788-01 <5.0 200 200 168 168 ug/L EPA 8260E 6117104 84.1 84.1 0.0826 70-130 25 <br /> Methyl-t-Butyl Ether 38788-01 <0.50 40.0 40.0 33.7 34.2 ug/L EPA 8260B 6117104 84.3 85.5 1.43 70-130 25 <br /> i <br /> I <br /> t <br /> Approved By:-tiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95516 530-297-4800 <br />