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Report Number 24835 <br /> QC Report : Matrix Spikel Matrix Spike Duplicate Datef 2/28/2002 <br /> Project Name 620 W. Charter Way, <br /> Project Number 020214-EB-1 <br /> Duplicate Spiked <br /> Duplicate Spiked SpikedSample 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 11 Diff Limit Limit <br /> Benzene 24838-01 <0 50 196 196 194 19 3 uglL EPA 8260B 21251200298 8 986 0 228 70-130 25 <br /> Toluene 24838-01 <0 50 196 19 6 201 201 uglL EPA 8260B 212512002102 103 0 317 70-130 25 <br /> Tert-Butanol 24838-01 <5 0 98 0 979 916 98 2 uglL EPA 8260B 21251200293 4 100 706 70-130 25 <br /> Methyl-t-Butyl Ether 24838-01 7 7 196 196 240 238 uglL EPA 8260B 2125/200283 0 820 1 17 70-130 25 <br /> Benzene 24835-01 <0 50 400 400 400 405 uglL EPA 82608 212112002100 101 1 12 70-130 25 <br /> Toluene 24835-01 <0 50 400 400 421 417 ug/L EPA 8260B 212112002105 104 0 979 70-130 25 <br /> Tert-Butanol 24835-01 <5 0 200 200 203 203 ug/L EPA 82608 2121/2002101 101 0 00986 70-130 25 <br /> Methyl-t-Butyl Ether 24835-01 <0 50 400 400 353 404 uglL EPA 8260B 21211200288 2 101 134 70-130 25 <br /> I <br /> Benzene 24911-01 0 54 400 400 417 414 ug/L EPA 82608 2125112002103 102 0 683 70-130 25 <br /> Toluene 24911-01 <0 50 400 400 433 422 ug/L EPA 82608 212512002108 105 260 70-130 25 <br /> Tert-Butanol 24911-01 <5 0 200 200 202 206 uglL EPA 8260B 212512002101 103 169 70-130 25 <br /> Methyl-t-Butyl Ether 24911-01 10 400 400 472 523 ug/L EPA 8260B 2125/2002918 104 129 70-130 25 <br /> Approved By J I I Kiff <br /> KIFF ANA YTiCAL, LLC I <br /> 720 Olive Dnveu , Suite vis, CA 95616 530-297-4800 <br /> it <br />