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Report Number 48021 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 1126/2006 <br /> Project Name 7-Eleven Store#19976 <br /> Project Number 77EL 19976 05 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Dur) 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 48021-01 079 400 400 443 430 ug/L EPA 82606 1124106 109 106 306 70-130 25 <br /> Toluene 48021-01 <0 50 400 400 428 41 6 ug/L EPA 8260B 1124106 107 104 303 70-130 25 <br /> Tert-Butanol 48021-01 78 200 200 220 217 ug/L EPA 8260B 1124106 106 105 145 70-130 25 <br /> Methyl-t-Butyl Ether48021-01 56 400 400 103 102 ug/L EPA 82608 1124106 116 115 1 09 70-130 25 <br /> Benzene 48021-02 <0 50 400 400 41 6 41 7 ug/L EPA 8260B 1124106 104 104 0 153 70-130 25 <br /> Toluene 48021-02 <0 50 400 400 389 388 ug/L EPA 82606 1124106 97 3 970 0 323 70-130 25 <br /> Tert-Butanol 48021-02 <5 0 200 200 211 220 ug/L EPA 82606 1124106 106 110 400 70-130 25 <br /> Methyl-t-Butyl Ether 48021-02 <0 50 400 400 402 402 ug/L EPA 8260B 1124/06 100 100 00550 70-130 25 <br /> &qi <br /> Approved By geiff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />