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Report Number 210 <br /> QC Report - Matrix Spike/Matrix Spike Duplicate Date 2/6/2002 <br /> Project Name 2575 COUNTRY CLUB, <br /> Project Number <br /> Duplicate Spiked <br /> Duplicate SpikedSpiked 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 24556-02 <0 50 19 7 201 17 3 200 ug1L EPA 8260B 1131/200287 5 99 6 129 70-130 25 <br /> Toluene 24556-02 <0 50 197 201 172 200 ug1L EPA 82606 11311200287 2 994 131 70-130 25 <br /> Tert-Butanol 24556-02 <5 0 987 101 96 2 964 ug/L EPA 8260B 11311200297 4 95 8 1 71 70-130 25 <br /> Methyl-t-Butyl Ether 24556-02 <0 50 197 201 182 196 ug/L EPA 8260E 1/31/200292 4 976 5 55 70-130 25 <br /> Benzene 24530-15 2 7 400 400 420 420 ug1L EPA 8260E 11311200298 3 982 00509 70-130 25 <br /> Toluene 24530-15 6 9 400 400 45 6 455 ug/L EPA 8260B 11311200296 8 964 0 388 70-130 25 <br /> Tert-Butanol 24530-15 <5 0 200 200 199 177 ug1L EPA 82608 11311200299 5 886 11 6 70-130 25 <br /> Methyl-t-Butyl Ether 24530-15 061 400 400 372 363 ug1L EPA 8260E 11311200291 5 89 2 260 70-130 25 <br /> I <br /> � 1 <br /> Approved By J i Kiff 1 <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />