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Report Number 38105 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 05/10/2004 <br /> Project Name 7-Eleven Store ##20632 <br /> Project Number 77EL 20632 03 <br /> Duplicate Spiked Spiked to 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 38107-10 069 400 400 461 462 uglL EPA 8260B 511104 114 114 0 192 70-130 25 <br /> Toluene 38107-10 0 59 400 400 446 45 3 uglL EPA 8260B 511104 110 112 1 52 70-130 25 <br /> Tert-Butanol 38107-10 <5 0 200 200 224 217 uglL EPA 8260B 511104 112 108 342 70-130 25 <br /> Methyl-t-Butyl Ether 38107-10 068 400 400 471 472 ug/L EPA 8260E 511104 116 116 0 134 70-130 25 <br /> Benzene 38098-06 <0 50 400 400 41 1 404 uglL EPA 8260B 4/30104 103 101 1 61 70-130 25 <br /> Toluene 38098-06 <0 50 400 400 392 386 uglL EPA 8260E 4130104 979 966 1 32 70-130 25 <br /> Tert-Butanol 38098-06 <5 0 200 200 195 190 uglL EPA 8260B 4130104 976 94 9 277 70-130 25 <br /> Methyl-t-Butyl Ether 38098-06 1 5 400 400 421 41 5 ug/L EPA 8260B 4130104 102 99 8 1 68 70-130 25 <br /> Benzene 38101-20 <0 50 400 400 408 392 ug1L EPA 82606 512104 102 980 406 70-130 25 <br /> Toluene 38101-20 <0 50 400 400 41 6 40 1 uglL EPA 8260B 512104 104 100 353 70-130 25 <br /> Tert-Butanol 38101-20 <5 0 200 200 201 201 ug/L EPA 82606 512104 100 101 0 178 70-130 25 <br /> Methyl-t-Butyl Ether 38101-20 <0 50 400 400 39 5 389 uglL EPA 82606 5!2104 988 972 164 70-130 25 <br /> t I <br /> KIFF ANALYTICAL, LLC Approved By R Paul Furry <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />