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Report Number 29962 <br /> QC Report. Matrix Spike/Matrix Spike Duplicate 11 <br /> Date 12/04/2002 <br /> i <br /> Project Name 2575 Country Club Blvd> <br /> Project Number 244-0783 <br /> Duplicate Spiked <br /> DuplicateSpiked 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 Sam le Value Level Level Value Value Units Method Analyzed Recov Recov 11 Diff Limit Limit <br /> Benzene 29947-01 <0 50 388 38 0 41 0 39 8 ug/L EPA 8260B 11/25/02 106 105 0 784 70-130 25 <br /> Toluene 29947-01 <0 50 38 8 38 0 404 396 ug/L EPA 82608 11/25/02 104 104 00961 70-130 25 <br /> Tert-Butanol 29947-01 <5 0 194 190 180 189 ug/L EPA 82608 11/25/02 927 99 2 679 70-130 25 <br /> Methyl-t-Butyl Ether 29947-01 <0 50 38 8 380 35 5 35 8 ug/L EPA 8260B 11/25/02 914 941 296 70-130 25 <br /> Benzene 30055-02 <0 50 400 400 392 373 ug/L EPA 8260B 11/30/02 981 93 2 510 70-130 25 <br /> Toluene 30055-02 <0 50 400 400 368 34 9 ug/L EPA 82608 11/30/02 921 87 2 544 70-130 25 <br /> Tert-Butanol 30055-02 <5 0 200 200 202 210 ug/L EPA 8260B 11/30/02 101 105 356 70-130 25 <br /> Methyl-t-Butyl Ether 30055-02 <0 50 400 400 36 8 361 ug/L EPA 8260B 11/30/02 91 9 902 181 70-130 25 <br /> Benzene 29943-05 <0 50 400 400 384 371 ug/L EPA 8260E 11/22/02 961 928 352 70-130 25 <br /> Toluene 29943-05 <0 50 400 400 38 4 376 ug/L EPA 8260B 11/22/02 961 941 2 08 70-130 25 <br /> Tert-Butanol 29943-05 <5 0 200 200 194 195 ug/L EPA 8260B 11/22/02 969 974 0 540 70-130 25 <br /> Methyl-t-Butyl Ether 29943-05 097 400 400 402 398 ug/L EPA 8260B 11/22/02 982 970 120 70-130 25 <br /> Approved By J I Kiff 1 <br /> �KIFF AN /CAL, LLC <br /> 2795 2nd St, Suite 300 is, CA 95616 530-297-4800 <br /> 1� 11 <br />