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i i <br /> Report Number 20 <br /> QC Report . Matrix Spike/Matrix Spike Duplicate Date 5/30/2002 <br /> Project Name 2575 Country Club Dr. <br /> Project Number 244-0783-003 <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 /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 26520-01 <0 50 196 195 18.8 186 uglL EPA 8260E 5125102 958 95 3 0 575 70-130 25 <br /> Toluene 26520-01 <0.50 196 195 196 194 uglL EPA 82608 5125/02 100 99 5 0 576 70-130 25 <br /> Tert-Butanol 26520-01 <5 0 97 9 97 6 951 97,3 uglL EPA 82608 5125102 971 997 266 70-130 25 <br /> Methyl-t-Butyl Ether 26520-01 0 81 196 195 182 18 0 uglL EPA 82608 5125102 889 88 3 0 695 70-130 25 <br /> Benzene 26531-02 <0 50 400 400 373 369 uglL EPA 8260B 5123102 932 92 3 1 02 70-130 25 <br /> Toluene 26531-02 <0 50 400 400 38 8 38 2 uglL EPA 82608 5123102 970 95 4 161 70-130 25 <br /> Tert-Butanol 26531-02 6700 200 200 6800 6640 uglL EPA 8260E 5123102 491 000 200 70-130 25 <br /> j Methyl-t-Butyl Ether 26531-02 4 9 400 400 39 0 390 uglL EPA 8260E 5123102 85 2 853 0117 70-130 25 <br /> KIFF ANALYTICAL, LLC Approved By JI Kill <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />