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Report Number 3506 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 9/29/2003 <br /> Project Name 7-Eleven Store #14117 <br /> Project Number 77EL 14117 03 <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 /> Tert-Butanol 35028-02 <5 0 200 200 208 206 ug/L EPA 8260B 9/23103 104 103 1 08 70-130 25 <br /> Methyl-t-Butyl Ether 35028-02 44 400 400 908 873 ug/L EPA 82608 9123103 118 109 783 70-130 25 <br /> Benzene 35152-03 <0 50 400 400 446 442 ug/L EPA 8260B 9126/03 111 110 0 946 70-130 25 <br /> Toluene 35152-03 <0 50 400 400 408 407 ug/t_ EPA 8260E 9126103 102 102 0 196 70-130 25 <br /> Tert-Butanol 35152-03 <5 0 200 200 207 201 ug/L EPA 8260B 9126103 104 100 306 70-130 25 <br /> Methyl-t-Butyl Ether 35152-03 <0 50 400 400 445 45 8 ug/L EPA 8260B 9126103 111 115 301 70-130 25 <br /> 1 <br /> f <br /> Approved By 1 I <br /> KIFF ANALYTICAL, LLC f <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />