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Report Number 31640 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 313103 <br /> Project Name 2575 Country Club Blvd <br /> Project Number 245-0783 <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 Drff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 31621-01 <0 50 400 400 366 365 ug/L EPA 8260B 2121103 91 6 91 4 0 219 70-130 25 <br /> Toluene 31621-01 <0 50 400 400 355 356 ug/L EPA 82606 2121103 887 890 0 310 70-130 25 <br /> Tert-Butanol 31621-01 <50 200 200 194 197 ug/L EPA 8260E 2121103 972 98 5 1 36 70-130 25 <br /> Methyl-t-Butyl Ether 31621-01 3 4 400 400 41 0 41 0 ug/L EPA 82608 2121103 942 941 00531 70-130 25 <br /> Benzene 31655-01 <0 50 39 4 391 398 401 ug/L EPA 8260E 2123103 101 103 1 64 70-130 25 <br /> Toluene 31655-01 <0 50 39 4 391 381 38 4 ug/L EPA 82606 2123103 968 98 2 1 46 70-130 25 <br /> Tert-Butanol 31655-01 <5 0 197 195 183 183 ug/L EPA 8260B 2123103 928 936 0 874 70-130 25 <br /> Methyl-t-Butyl Ether 31655-01 <0 50 39 4 391 36 2 363 ug/L EPA 82608 2123103 920 930 1 13 70-130 25 <br /> i <br /> I <br /> Approved By J611 Kiff <br /> KIFF ANALYTICAL, LLC I U <br /> V <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />