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i <br /> Report Number 34117 <br /> QC Report Matrix Spikel Matrix Spike Duplicate Date 7/21/2003 <br /> Protect Name 7-Eleven Store #21756 <br /> Protect Number 77EL.21756.03 <br /> I <br /> i <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 34114-02 <0 50 396 398 38 5 393 ug/L EPA 8260E 7119103 972 986 1 38 70-130 25 <br /> Toluene 34114-02 <0 50 396 398 385 39 3 ug/L EPA 82606 7119103 972 987 153 70-130 25 <br /> Tert-Butanol 34114-02 <50 198 199 186 184 uglL EPA 8260B 7119103 942 924 1 93 70-130 25 <br /> Methyl-t-Butyl Ether 34114-02 <0 50 396 398 398 40 9 ug/L EPA 8260B 7119103 100 103 199 70-130 25 <br /> Benzene 34105-08 <0 50 400 400 41 1 375 ug/L EPA 8260B 7117103 103 938 911 70-130 25 <br /> Toluene 34105-08 <0 50 400 400 392 383 ug/L EPA 8260B 7117103 980 958 2 19 70-130 25 <br /> Tert-Butanol 34105-08 <50 200 200 212 209 ug/L EPA 82608 7117103 106 104 1 82 70-130 25 <br /> Methyl-t-Butyl Ether 34105-08 <0 50 400 400 468 42 0 ug/L EPA 82606 7117103 117 105 108 70-130 25 <br /> Benzene 34129-01 <0 50 400 400 388 384 uglL EPA 8260E 7119103 969 959 1 01 70-130 25 <br /> Toluene 34129-01 <0 50 400 400 405 388 ug1L EPA 82608 7119103 101 970 426 70-130 25 <br /> Tert-Butanol 34129-01 <50 200 200 210 206 ug/L EPA 82606 7/19103 105 103 149 70-130 25 <br /> Methyl-t-Butyl Ether 34129-01 <0 50 400 400 403 418 ug/L EPA 82606 7/19103 101 104 373 70-130 25 <br /> Approved KIFF ANALYTICAL, LLC By J I Ki <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br /> I <br /> i <br />