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L <br /> Report Number: 28929 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 10/14/2002 <br /> Project Name : 404 West Fremont <br /> Project Number: 1628.10 <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 28926-01 <0.50 39.7 39.6 42.7 42.5 ug/L EPA 8260B 10/11/02 108 107 0.233 70-130 25 <br /> Toluene 28926-01 <0.50 39.7 39.6 42.2 41.8 ug/L EPA 8260B 10/11/02 106 106 0.826 70-130 25 <br /> Tert-Butanol 28926-01 <5.0 198 198 205 201 ug/L EPA 82606 10/11/02 103 102 1.64 70-130 25 <br /> Methyl-t-Butyl Ether 28926-01 170 39.7 39.6 203 195 ug/L EPA 8260B 10/11/02 79.1 58.3 30.3 70-130 25 <br /> Benzene 28929-02 <0.50 40.0 40.0 41.4 40.8 ug/L EPA 8260B 10/2/02 104 102 1.46 70-130 25 <br /> Toluene 28929-02 <0.50 40.0 40.0 40.3 39.8 ug/L EPA 8260B 10/2/02 101 99.6 1.15 70-130 25 <br /> Tert-Butanol 28929-02 <5.0 200 200 221 220 ug/L EPA 8260B 10/2/02 111 110 0.675 70-130 25 <br /> Methyl-t-Butyl Ether 28929-02 0.87 40.0 40.0 34.1 34.4 ug/L EPA 8260B 10/2/02 83.2 83.8 0.808 70-130 25 <br /> Benzene 28891-13 14 40.0 40.0 56.4 54.5 ug/L EPA 8260B 10/2/02 105 99.9 4.62 70-130 25 <br /> Toluene 28891-13 31 40.0 40.0 77.2 74.6 ug/L EPA 8260B 10/2/02 115 108 5.81 70-130 25 <br /> Tert-Butanol 28891-13 <5.0 200 200 214 199 ug/L EPA 8260B 10/2/02 107 99.6 7.41 70-130 25 <br /> Methyl-t-Butyl Ether 28891-13 <0.50 40.0 40.0 43.1 42.7 ug/L EPA 8260B 10/2/02 108 107 0.862 70-130 25 <br /> Benzene 28873-01 <0.50 40.0 40.0 38.7 37.4 ug/L EPA 8260B 10/3/02 96.6 93.6 3.23 70-130 25 <br /> Toluene 28873-01 <0.50 40.0 40.0 38.8 38.8 ug/L EPA 8260B 10/3/02 97.0 96.9 0.155 70-130 25 <br /> Tert-Butanol 28873-01 <5.0 200 200 202 196 ug/L EPA 8260B 10/3/02 101 97.8 3.06 70-130 25 <br /> Methyl-t-Butyl Ether 28873-01 <0.50 40.0 40.0 42.8 42.5 ug/L EPA 8260B 10/3/02 107 106 0.750 70-130 25 <br /> Benzene 28925-08 <0.50 40.0 40.0 39.6 38.6 ug/L EPA 8260B 10/4/02 99.0 96.5 2.58 70-130 25 <br /> Toluene 28925-08 <0.50 40.0 40.0 37.6 37.3 ug/L EPA 8260B 10/4/02 93.9 93.3 0.588 70-130 25 <br /> Approved By: Joel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 V <br />