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i <br /> Report Number 40179 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 9/24/2004 <br /> Project Name 7-Eleven Store#19976 <br /> Project Number 77EL.19976 04 <br /> Siked <br /> Duplicate Spiked Spikled to Sample Relative <br /> SpikeSpiked 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 40179-01 91 400 400 501 48 6 ug/L EPA 8260B 9120104 102 98 7 3 69 70-130 25 <br /> Toluene 40179-01 <0 50 400 400 386 377 ug/L EPA 82608 9120104 964 94 2 2 27 70-130 25 <br /> Tert-Butanol 40179-01 13 200 200 204 204 ug/L EPA 8260B 9120/04 955 95 3 0 257 70-130 25 <br /> Methyl4-Butyl Ether40179-01 160 400 400 226 224 ug/L EPA 8260B 9/20/04 154 148 4 04 70-130 25 <br /> Benzene 40241-01 <0 50 400 400 38 4 378 ug/L EPA 8260B 9/23104 961 94 4 1 80 70-130 25 <br /> Toluene 40241-01 <0 50 400 400 38 0 371 ug/L EPA 82608 9123104 951 928 242 70-130 25 <br /> Tert-Butanol 40241-01 <5 0 200 200 184 184 ug/l_ EPA 82606 9/23/04 91 9 91 9 00519 70-130 25 <br /> Methyl-t-Butyl Ether 40241-01 <0 50 400 400 407 401 ug/L EPA 8260B 9123104 102 100 144 70-130 25 <br /> Benzene 40188-01 <0 50 400 400 419 407 ug/L EPA 8260B 9121/04 105 102 2 84 70-130 25 <br /> Toluene 40188-01 <0 50 400 400 402 387 ug/L EPA 8260B 9/21104 100 968 363 70-130 25 <br /> Tert-Butanol 40188-01 <5 0 200 200 207 205 ug/L EPA 8260B 9121104 104 103 0 798 70-130 25 <br /> Methyl-t-Butyl Ether40188-01 34 400 400 429 429 ug/L EPA 8260B 9121104 98 9 988 0 115 70-130 25 <br /> Approved By .jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 is, CA 95616 530-297-4800 <br />