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r <br /> Report Number A <br /> QC Report: Matrix Spike/ Matrix Spike Duplicate Date 5/30/2002 <br /> Project Name 2575 Country Club Dr. <br /> Project Number 2440783-003 <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 /> ecov Diff Limit Limit <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov R <br /> Benzene 26520-01 <0 50 196 195 188 186 ug/L EPA 8260B 5125102 95 8 95 3 0 575 70-130 25 <br /> Toluene 26520-01 <0,50 196 195 196 194 ug/L EPA 82608 5/25102 100 99 5 0 576 70-130 25 <br /> Tert-Butanol 26520-01 <5 0 979 976 951 973 ug/L EPA 82608 5/25102 971 997 266 70-130 25 <br /> Methyl-t-Butyl Ether 26520-01 081 19.6 195 182 180 uglL EPA 8260B 5/25/02 889 88 3 0 695 70-130 25 <br /> Benzene 26531-02 <0.50 400 400 373 36 9 ug/L EPA 8260E 5/23/02 932 923 102 70-130 25 <br /> Toluene 26531-02 <0 50 400 400 38 8 382 ug/L EPA 82608 5/23/02 970 95.4 161 70-130 25 <br /> Tert-Butanol 26531-02 6700 200 200 6800 6640 ug/L EPA 8260B 5/23102 491 000 200 70-130 25 <br /> Methyl-t-Butyl Ether 26531-02 4 9 400 400 390 39 0 uglL EPA 8260B 5/23/02 85 2 85 3 0 117 70-130 25 <br /> Approved By J 1 Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />