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# Report Number: <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 4/26/2002 <br /> Project Name : 3725 South Tracy <br /> Project Number. 020418-DW-2 <br /> Duplicate Spiked <br /> Duplicate, L . . 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 25997-07 0.63 39.4 38.6 38.8 36.5 ug/L EPA 82608 4121102 96.8 92.9 4.15 70-130 25 <br /> Toluene 25997-07 <0.50 39.4 38.6 39.4 37.0 ug/L EPA 8260B 4121102 99.8 95.8 4.17 70-130 25 <br /> Tert-Butanol 25997-07 6.5 197 193 211 196 ug/L EPA 82608 4121102 104 98.0 5.69 70-130 25 <br /> Methyl-t-Butyl Ether 25997-07 0.80 39.4 38.6 36.5 36.6 ug/L EPA 8260E 4121/02 90.4 92.7 2.44 70-130 25 <br /> Benzene 25987-02 <0.50 40.0 40.0 42.1 41A ug/L EPA 82606 4120102 105 103 1.87 70-130 25 <br /> Toluene 25987-02 <0.50 40.0 40.0 42.7 41.4 ug/L EPA 8260B 4120102 107 103 3.16 70-130 25 <br /> Tert-Butanol 25987-02 <5.0 200 200 213 213 ug/L EPA 82608 4120102 106 106 0.174 70-130 25 <br /> Methyl-t-Butyl Ether 25987-02 9.6 40.0 40.0 52.9 53.9 ug/L EPA 8260E 4120102 108 111 2.33 70-130 25 <br /> KIF'F ANALYTICAL, LLC Approved By: J I Kiff <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />