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Report Number 32790 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 4123/2003 <br /> Project Name 7-Eleven Store #21756 <br /> i <br /> Project Number 77EL 21756 03 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Duo 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 32745-18 <0 50 400 400 41 2 406 ug/L EPA 8260B 4118103 103 101 1 64 70-130 25 <br /> Toluene 32745-18 <0 50 400 400 398 392 ug/L EPA 8260B 4118103 995 981 142 70-130 25 <br /> Tert-Butanol 32745-18 <5 0 200 200 210 211 ug/L EPA 8260B 4/18103 105 105 0 223 70-130 25 <br /> Methyl-t-Butyl Ether 32745-18 056 400 400 399 397 ug/L EPA 8260B 4118103 983 979 0 408 70-130 25 <br /> Benzene 32794-09 <0 50 400 400 41 7 402 ug1L EPA 8260B 4119103 104 100 3 66 70-130 25 <br /> Toluene 32794-09 <0 50 400 400 378 371 ug/L EPA 8260B 4119103 944 928 176 70-130 25 <br /> Tert-Butanol 32794-09 <5 0 200 200 202 213 ug/L EPA 82608 4119103 101 106 509 70-130 25 <br /> Methyl-t-Butyl Ether 32794-09 17 400 400 61 1 645 ug/L EPA 8260B 4119103 111 120 735 70-130 25 <br /> Benzene 32773-07 63 400 400 104 102 ug/L EPA 8260B 4121103 102 971 504 70-130 25 <br /> Toluene 32773-07 85 400 400 126 123 ug/L EPA 8260B 4121103 103 940 887 70-130 25 <br /> Tert-Butanol 32773-07 <5 0 200 200 210 212 ug/L EPA 8260E 4121103 105 106 0 913 70-130 25 <br /> Methyl-t-Butyl Ether 32773-07 34 400 400 445 440 ug/L EPA 8260B 4121103 103 101 1 20 70-130 25 <br /> Approved By J el Kill <br /> KIFF ANALYTICAL, LLC U <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />