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• Report Number 40 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 4/27/2006 <br /> Protect Name 7-Eleven Store #19976 <br /> Protect 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 49645-01 4 6 394 393 454 447 ug/L EPA 82608 4125106 103 102 1 50 70-130 25 <br /> Toluene 49645-01 1 4 394 393 409 41 5 ug/L EPA 8260B 4125106 100 102 1 80 70-130 25 <br /> Tert-Butanol 49645-01 50 197 196 271 263 ug/L EPA 82606 4125106 112 109 335 70-130 25 <br /> Methyl-t-Butyl Ether49645-01 370 394 393 422 395 ug/L EPA 8260B 4125106 126 582 737 70-130 25 <br /> Benzene 49656-03 <0 50 400 400 426 41 6 ug/L EPA 8260B 4126106 106 104 230 70-130 25 <br /> Toluene 49656-03 <0 50 400 400 41 0 404 ug/L EPA 82608 4126106 102 101 148 70-130 25 <br /> Tert-Butanol 49656-03 <5 0 200 200 205 221 ug/L EPA 8260B 4126/06 103 110 724 70-130 25 <br /> Methyl-t-Butyl Ether 49656-03 <0 50 400 400 41 2 41 3 ug/L EPA 8260B 4126106 103 103 0 337 70-130 25 <br /> Benzene 49644-05 <0 50 400 400 392 382 ug/L EPA 8260B 4126106 979 956 2 35 70-130 25 <br /> Toluene 49644-05 <0 50 400 400 39 5 381 ug/L EPA 8260B 4126106 987 953 357 70-130 25 <br /> Tert-Butanol 49644-05 <5 0 200 200 211 212 ug/L EPA 8260B 4126106 106 106 0 418 70-130 25 <br /> Methyl-t-Butyl Ether 49644-05 3 8 400 400 38 0 397 ug/L EPA 8260B 4126106 856 89 8 483 70-130 25 <br /> I <br /> }`t& I j <br /> Approved By joe;l jiff <br /> KIFF ANALYTICAL, LLC <br /> u <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />