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Report Number 28264 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Dater 9/10/2002 <br /> Project Name 2575 Country Club, <br /> Project Number 244-0783 <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 Valued Value Units Method Analyzed Recov Recov II Diff Limit Limit <br /> Benzene 28408-02 <0.50 400 400 410 405 ug/L EPA 8260E 9M02 103 101 137 70-130 25 <br /> Toluene 28408-02 <0.50 400 400 393 395 ug/L EPA 82608 917/02 98 3 98 7 0 431 70-130 25 <br /> Tert-Butanol 28408-02 12 200 200 211 210 ug/L EPA 8260B 917102 996 988 0 731 70-130 25 <br /> Methyl-t-Butyl Ether 28408-02 <0 50 400 400 344 330 ug/L EPA 8260B 917/02 861 824 433 70-130 25 <br /> I <br />� I <br /> ' <br /> KIFF ANAL ]CAL, LLC Approved By J I Kiff <br /> 720 Olive Dnve, Suite Diis, CA 95616 530-297-4800 • <br /> 11 �� <br />