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Report Number 34338 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 8!712003 <br /> Project Name 7-Eleven Store#20632 <br /> Project Number 77EL.20632 03 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD 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 34359-01 <0 50 403 39 6 429 423 ug/L EPA 8260B 816103 106 107 0 398 70-130 25 <br /> Toluene 34359-01 <0 50 403 39 6 432 427 ug/L EPA 82608 816103 107 108 0 675 70-130 25 <br /> Tert-Butanol 34359-01 <5 0 202 198 198 196 ug/L EPA 82608 816103 982 990 0 831 70-130 25 <br /> Methyl-t-Butyl Ether 34359-01 <0 50 403 39 6 409 407 ug/L EPA 8260B 8/6103 102 103 127 70-130 25 <br /> Benzene 34323-01 <0 50 400 400 393 389 ug/L EPA 8260B 814103 984 974 102 70-130 25 <br /> Toluene 34323-01 <0 50 400 400 457 404 ug/L EPA 82606 814103 114 101 123 70-130 25 <br /> Tert-Butanol 34323-01 <50 200 200 209 206 ug/L EPA 8260B 814103 104 103 125 70-130 25 <br /> Methyl-t-Butyl Ether 34323-01 <0 50 400 400 421 431 ug/L EPA 82606 814103 105 108 221 70-130 25 <br /> Approved By 16el Kiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 V <br />