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Report Number: 20620 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 7/19/2001 <br /> Project Name : 1267 Country Club, <br /> Project Number: 010605-K3 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked I 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;J Value Units Method Analyzed Recov. Recov.11 Diff. Limit Limit <br /> Spike Recovery Data <br /> Benzene 20628-01 <0.50 250 248 245 238 ug/L EPA 8260B 6115/200198.0 96.4 1.67 70-130 25 <br /> Toluene 20628-01 <0.50 250 248 241 227 ug/L EPA 82606 61151200196.3 91.9 4.72 70-130 25 <br /> Tert-Butanol 20628-01 43 250 248 342 308 ug/L EPA 82606 611512001120 107 11.0 70-130 25 <br /> Methyl-t-B utyl Ether 20628-01 1600 250 248 2430 2410 ug/L EPA 8260B 611512001352 347 1.30 70-130 25 <br /> Approved By: Jl I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite Dois, CA 95616 530-297-4800 <br />� it II <br />