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Report Number. 29116 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 10/17/02 <br /> Project Name : Beacon Station 12474 <br /> Project Number: 1474.13 <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 29089-02 <0.50 40.0 40.0 40.6 40.1 ug/L EPA 8260B 10/12/02 101 100 1.16 70-130 25 <br /> Toluene 29089-02 <0.50 40.0 40.0 37.9 38.0 ug/L EPA 82606 10/12/02 94.6 94.9' 0.264 ' 70-130 25 <br /> Tert-Butanol 29089-02 270 200 200 498 468 ug/L EPA 82608 10/12/02 112 97.2 14.6 70-130 25 <br /> Methyl-t-Butyl Ether 29089-02 <0.50 ' 40.0 40.0 43.6 43.6 uglL EPA 82606 10/12/02 109 109 0.184 70-130 25 <br /> Benzene 29143-01 <0.50 40.0 40.0 42.7 41.7 ug/L EPA 82606 10/14/02 107 104 2.23 70-130 25 <br /> Toluene 29143-01 <0.50 40.0 40.0 42.3 41.9 ug/L EPA 8260E 10/14/02 106 105 0.950 70-130 25 <br /> Tert-Butanol 29143-01 <5.0 200 200 191 193 ug/L EPA 8260B 10/14/02 95.6 96.5 0.973 70-130 25 <br /> Methyl-t-Butyl Ether 29143-01 <0.50 40.0 40.0 42.4 41.8 ug/L EPA 82606 10/14/02 106 104 1.59 70-130 25 <br /> �.. 0 <br /> Approved By: Joel Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 ��r <br />