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Report Number 42458 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 2/26/2005 <br /> Protect Name 7-Eleven Store#20632 <br /> Project Number 77EL 20632 04 <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 /> Benzene 42459-04 <0 50 400 391 424 41 2 ug/L EPA 8260E 2122105 106 105 0 392 70-130 25 <br /> Toluene 42459-04 <0 50 400 391 409 399 ug/L EPA 8260B 2122/05 102 102 00942 70-130 25 <br /> Tert-Butanol 42459-04 <5 0 200 195 193 184 ug/L EPA 8260B 2122105 967 940 2 77 70-130 25 <br /> Methyl-t-Butyl Ether 42459-04 <0 50 400 391 356 363 ug/L EPA 82608 2122105 891 92 8 406 70-130 25 <br /> Benzene 42461-06 <0 50 400 400 39 6 386 ug/L EPA 82608 2123105 991 965 265 70-130 25 <br /> Toluene 42461-06 <0 50 400 400 382 380 ug/L EPA 82608 2123105 956 950 0 664 70-130 25 <br /> Tert-Butanol 42461-06 <50 200 200 206 202 ug/L EPA 8260B 2/23105 103 101 214 70-130 25 <br /> Methyl-t-Butyl Ether42461-06 <0 50 400 400 341 351 ug/L EPA 8260B 2123105 85 3 877 278 70-130 25 <br /> Benzene 42492-01 2 9 400 400 444 435 ug/L EPA 82608 2124105 104 102 226 70-130 25 <br /> Toluene 42492-01 38 400 400 778 761 ug/L EPA 82606 2124105 999 956 440 70-130 25 <br /> Tert-Butanol 42492-01 360 200 200 544 537 ug/L EPA 82608 2124105 928 892 392 70-130 25 <br /> Methyl-t-Butyl Ether42492-01 12 400 400 530 528 ug/L EPA 82608 2124105 104 103 0 580 70-130 25 <br /> Benzene 42458-04 650 400 400 636 614 ug/L EPA 8260B 2119105 000 000 0 00 70-130 25 <br /> Toluene 42458-04 130 400 400 153 148 ug/L EPA 62606 2119105 654 550 173 70-130 25 <br /> Tert-Butanol 42458-04 16000 200 200 13100 12200 ug/L EPA 8260B 2119105 000 000 000 70-130 25 <br /> Methyl-t-Butyl Ether42458-04 2600 400 400 2630 2580 ug/L EPA 82606 2119105 000 000 000 70-130 25 <br /> Benzene 42454-08 <0 50 400 400 382 373 ug/L EPA 8260B 2122/05 955 932 245 70-130 25 <br /> Toluene 42454-08 <0 50 400 400 390 381 ug/L EPA 8260B 2122105 974 952 234 70-130 25 <br /> i <br /> i <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />