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• • s <br /> Report Number 42167 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/7/2005 <br /> Project Name 7-Eleven Store#14117 <br /> Project Number 77EL.14117 05 <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 42170-02 <5 0 200 200 208 207 ug/L EPA 82606 213105 104 103 0 433 70-130 25 <br /> Methyl-t-Butyl Ether42170-02 2 7 400 400 376 376 ug/L EPA 8260B 213105 872 872 00235 70-130 25 <br /> Benzene 42163-08 12 400 400 38 7 378 ug/L EPA 8260B 212!05 938 91 6 234 70-130 25 <br /> Toluene 42163-08 <0 50 400 400 405 401 ug/L EPA 8260B 212105 101 100 0 948 70-130 25 <br /> Tert-Butanol 42163-08 13 200 200 223 221 ug/L. EPA 8260B 212105 105 104 128 70-130 25 <br /> Methyl-t-Butyl Ether 42163-08 270 400 400 291 300 ug/L EPA 8260B 212105 606 84 4 327 70-130 25 <br /> Approved By jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />