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0 0 Report Number 20 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 7/16/2002 <br /> Project Name 620 W. Charter Way, <br /> Project Number 244-0778 <br /> i <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked 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 26959-02 <0 50 402 394 384 383 ug/L EPA 8260B 6127102 957 971 143 70-130 25 <br /> Toluene 26959-02 <0 50 402 39 4 378 364 ug/L EPA 8260B 6127102 94 2 922 209 70-130 25 <br /> Tert-Butanol 26959-02 <5 0 201 197 200 192 ug/L EPA 82606 6127102 997 974 238 70-130 25 <br /> Methyl-t-Butyl Ether 26959-02 <0 50 402 394 380 375 ug/L EPA 8260E 6/27102 94 7 95 2 0 500 70-130 25 <br /> Benzene 26793-01 <0 50 400 400 405 393 ug/L EPA 82608 6116102 101 98 3 308 70-130 25 <br /> Toluene 26793-01 <0 50 400 400 385 38 0 ug/L EPA 8260B 6116/02 962 95 0 1 31 70-130 25 <br /> Tert-Butanol 26793-01 <5 0 200 200 205 198 ug/L EPA 8260E 6116102 102 99 0 338 70-130 25 <br /> Methyl-t-Butyl Ether 26793-01 <0 50 400 400 348 34 6 ug/L EPA 82608 6116102 86 9 866 0 317 70-130 25 <br /> Benzene 26919-01 <0 50 400 400 376 357 ug/L EPA 8260B 6116102 941 892 529 70-130 25 <br /> Toluene 26919-01 <0 50 400 400 31 7 301 ug/L EPA 82606 6116102 792 752 521 70-130 25 <br /> Tert-Butanol 26919-01 11 200 200 219 218 ug/L EPA 8260B 6/16102 104 104 0 255 70-130 25 <br /> Methyl-t-Butyl Ether 26919-01 130 400 400 165 160 ug/L EPA 8260B 6116/02 965 86 3 11 2 70-130 25 <br /> Benzene 26948-01 <0 50 400 400 44 0 422 ug/L EPA 8260B 6117102 110 105 4 09 70-130 25 <br /> Toluene 26948-01 <0 50 400 400 390 377 ug/L EPA 82606 6117/02 974 94 2 331 70-130 25 <br /> Tert-Butanol 26948.01 <5 0 200 200 203 207 ug/L EPA 8260B 6117102 101 104 224 70-130 25 <br /> Methyl-t-Butyl Ether 26948-01 <0 50 400 400 408 402 ug/L EPA 8260E 6117102 102 100 1 41 70-130 25 <br /> Benzene 26819-01 <0 50 400 400 370 356 ug/L EPA 8260B 6116102 926 889 4 13 70-130 25 <br /> Toluene 26819-01 <0 50 400 400 376 36 3 ug/L EPA 8260E 6/16102 94 0 907 357 70-130 25 <br /> I <br /> i <br /> Approved By J e! Kiff <br /> K11=F ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />