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Report Number 320 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date 4/29/2003 <br /> Project Name 7910 Lower Sacramento <br /> Project Number 030424-EB-2 <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 32862-14 0 93 400 400 395 396 ug/L EPA 8260B 4125103 965 966 00777 70-130 25 <br /> Toluene 32862-14 14 400 400 415 417 ug/L EPA 8260B 4125103 100 101 0 348 70-130 25 <br /> Tert-Butanol 32862-14 <5 0 200 200 206 212 ug/L EPA 8260B 4125103 103 106 2 84 70-130 25 <br /> Methyl-t-Butyl Ether 32862-14 73 400 400 121 121 ug1L EPA 8260B 4125103 121 120 0 394 70-130 25 <br /> — 1W q <br /> Approved By J I Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />