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i <br /> Report Number A <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 11/18/2002 <br /> Project Name 2575 Country Club Blvd> <br /> Project Number 244-0783 <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Sample Sample Relative Percent Percent <br /> Spiked Sample Spike Duo 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 29676-04 <0 50 400 400 421 422 ug/L EPA 8260B 11/10/02 105 105 0 190 70-130 25 <br /> Toluene 29676-04 <0 50 400 400 405 408 ug/L EPA 82608 11/10/02 101 102 0 811 70-130 25 <br /> Tert-Butanol 29676-04 <5 0 200 200 201 215 ug/L EPA 8260B 11/10/02 100 107 6 82 70-130 25 <br /> Methyl-t-Butyl Ether 29676-04 <0 50 400 400 39 6 39 6 ug/L EPA 8260B 11/10/02 990 990 0 101 70-130 25 <br /> Benzene 29606-04 <0 50 400 400 41 6 422 ug/L EPA 8260B 1118102 104 106 1 53 70-130 25 <br /> Toluene 29606-04 <0 50 400 400 41 9 428 ug/L EPA 8260B 11/8102 105 107 213 70-130 25 <br /> Tert-Butanol 29606-04 1800 200 200 1100 1020 ug/L EPA 8260B 1118102 0 00 000 000 70-130 25 <br /> Methyl-t-Butyl Ether 29606-04 <0 50 400 400 457 470 ug/L EPA 82608 1118102 114 117 285 70-130 25 <br /> � 1 <br /> Approved By J�el Kill <br /> KIF'F ANALYTICAL, LLC U2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />