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Report Number 260 <br /> QC Report, Matrix Spike/Matrix Spike Duplicate Date 5/9/2002 <br /> Project Name 2575 Country Club, <br /> Project Number 020501-BM1 <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 26204-20 <0 50 398 39 8 360 376 ug/L EPA 82608 517102 903 943 436 70-130 25 <br /> Toluene 26204-20 <0 50 39 8 398 355 364 uglL EPA 82608 517102 892 914 246 70-130 25 <br /> Tert-Butanol 26204-20 <5 0 199 199 185 179 uglL EPA 82608 5M02 927 899 312 70-130 25 <br /> Methyl-t-Butyl Ether 26204-20 <0 50 39 8 39 8 341 337 uglL EPA 8260B 517102 855 845 120 70-130 25 <br /> Benzene 26218-01 <0 50 400 400 418 416 uglL EPA 8260B 515102 104 104 0 503 70-130 25 <br /> Toluene 26218-01 <0 50 400 400 495 516 uglL EPA 82608 515102 124 129 417 70-130 25 <br /> Tert-Butanol 26218-01 <5 0 200 200 202 233 uglL EPA 8260B 515102 101 117 143 70-130 25 <br /> Methyl-t-Butyl Ether 26218-01 <0 50 400 400 441 410 uglL EPA 8260B 515102 110 102 7 31 70-130 25 <br /> Benzene 26210-11 <0 50 400 400 418 414 uglL EPA 8260B 515102 105 103 113 70-130 25 <br /> Toluene 26210-11 <0 50 400 400 473 48 9 ug/L EPA 82608 515102 118 122 343 70-130 25 <br /> Tert-Butanol 26210-11 <5 0 200 200 228 228 ug/L EPA 8260B 515102 114 114 00745 70-130 25 <br /> Methyl-t-Butyl Ether 26210-11 <0 50 400 400 349 361 uglL EPA 82608 515102 872 90 2 341 70-130 25 <br /> I <br /> Benzene 26180-02 <0 50 400 400 373 364 uglL EPA 8260E 515102 933 91 1 236 70-130 25 <br /> Toluene 26180-02 <0 50 400 400 377 37 9 uglL EPA 8260B 515102 942 94 6 0 503 70-130 25 <br /> Tert-Butanol 26180-02 <5 0 200 200 194 202 uglL EPA 8260B 515102 970 101 424 70-130 25 <br /> Methyl-t-Butyl Ether 26180-02 <0 50 400 400 332 372 uglL EPA 8260B 515102 82 9 930 11 5 70-130 25 <br /> Benzene 26208-18 <0 50 400 400 440 430 uglL EPA 82608 515!02 110 108 216 70-130 25 <br /> Toluene 26208-18 <0 50 400 400 410 403 ug1L EPA 8260B 515102 102 101 152 70-130 25 <br /> I <br /> Approved By J ' l Kiff <br /> KIFF ANALYTICAL, LLC <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 <br />