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Report Number: 27777 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 8/9/2002 <br /> Project Name : Singh-Tracy <br /> Project Number: 3254 <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 27767-04 <0.50 99.5 98.0 106 104 ug/L EPA 8260E 813102 106 106 0.377 70-130 25 <br /> Toluene 27767-04 <0.50 99.5 98.0 106 104 ug/L EPA 8260B 813102 107 106 1.10 70-130 25 <br /> Tert-Butanol 27767-04 7.6 498 490 542 520 uglL EPA 8260E 813102 108 105 2.73 70-130 25 <br /> Methyl-t-Butyl Ether 27767-04 770 99.5 98.0 862 847 ug/L EPA 82606 813102 94.1 80.2 15.8 70-130 25 <br /> Benzene 27760-01 <0.50 40.0 40.0 40.2 39.7 ug/L EPA 8260B 812102 100 99.3 1.10 70-130 25 <br /> Toluene 27760-01 <0.50 40.0 40.0 37.0 36.5 ug/L EPA 82608 812102 92.4 91.2 1.33 70-130 25 <br /> Tert-Butanol 27760-01 <5.0 200 200 192 193 ug/L EPA 82606 812102 95.8 96.3 0.609 70-130 25 <br /> Methyl-t-Butyl Ether 27760-01 <0.50 40.0 40.0 39.8 40.6 ug/L EPA 8260B 812102 99.6 101 1.76 70-130 25 <br /> Approved By: Joel Kiff tV <br /> KIFF ANALYTICAL, LLC <br /> i <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />