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Report Number 37253 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 3/9/2004 <br /> Project Name COX + COX - 595 E. 11th <br /> Project Number <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 Lima <br /> Benzene 37261-01 <0 0050 00401 00402 00387 00386 mg/Kg EPA 82608 314104 965 96 0 0 491 70-130 25 <br /> Toluene 37261-01 <0 0050 00401 00402 00379 00381 mg/Kg EPA 8260B 314104 946 948 0 267 70-130 25 <br /> Tert-Butanol 37261-01 <0 0050 0200 0201 0187 0180 mg/Kg EPA 82606 3!4104 933 899 378 70-130 25 <br /> Methyl-t-Butyl Ether 37261-01 <0 0050 00401 00402 00450 00434 mg/Kg EPA 8260E 314104 112 108 394 70-130 25 <br /> 4 <br /> Approved By R P Furry <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />