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Report Number 39153 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 7/16/2004 <br /> Project Name 7-Eleven Store#20632 <br /> Project Number 77EL 20632 03 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike DUD 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 39148-03 <0 50 401 402 416 39 7 ug/L EPA 8260B 7112104 104 988 4 97 70-130 25 <br /> Toluene 39148-03 <0 50 401 402 420 406 ug/L EPA 82608 7112104 105 101 355 70-130 25 <br /> Tert-Butanol 39148-03 <5 0 200 201 192 195 ug/L EPA 8260B 7112104 958 973 154 70-130 25 <br /> Methyl-t-Butyl Ether 39148-03 <0 50 401 402 440 409 ug/L EPA 8260B 7112104 110 102 764 70-130 25 <br /> Benzene 39137-03 <0 50 400 400 398 39 2 ug/L EPA 8260B 7110104 995 979 160 70-130 25 <br /> Toluene 39137-03 <0 50 400 400 41 0 403 ug/L EPA 8260B 7/10104 103 101 175 70-130 25 <br /> Tert-Butanol 39137-03 52 200 200 204 203 ug/L EPA 8260B 7110104 99 3 990 0 253 70-130 25 <br /> Methyl-t-Butyl Ether 39137-03 1400 400 400 1380 1370 ug/L EPA 8260B 7110104 71 9 358 670 70-130 25 <br /> I <br /> Benzene 39131-01 <0 50 400 400 41 3 402 ug/L EPA 8260B 7112104 103 100 2 64 70-130 25 <br /> Toluene 39131-01 <0 50 400 400 41 7 41 0 ug/L EPA 82608 7112104 104 102 1 76 70-130 25 <br /> Tert-Butanol 39131-01 <5 0 200 200 201 198 ug/L EPA 82606 7112104 101 99 0 164 70-130 25 <br /> Methyl-t-Butyl Ether 39131-01 <0 50 400 400 431 429 ug/L EPA 8260B 7112104 108 107 0 427 70-130 25 <br /> Benzene 39147-01 <0 50 400 400 40 0 383 ug/L EPA 8260B 7113104 100 957 445 70-130 25 <br /> Toluene 39147-01 <0 50 400 400 402 39 0 ug/L EPA 8260B 7113104 100 974 3 04 70-130 25 <br /> Tert-Butanol 39147-01 <5 0 200 200 206 192 ug/L EPA 8260B 7113104 103 961 698 70-130 25 <br /> Methyl-t-Butyl Ether 39147-01 <0 50 400 400 409 404 ug/L EPA 8260B 7113104 102 101 1 18 70-130 25 <br /> Benzene 39172-03 <0 50 400 400 41 0 404 ug/L EPA 8260B 7113104 102 101 144 70-130 25 <br /> Toluene 39172-03 <0 50 400 400 414 409 ug/L EPA 8260B 7113/04 104 102 129 70-130 25 <br /> k, <br /> r <br /> � <br /> KIFF ANALYTICAL, LLC Approved By Je'# h <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 t <br />