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Report Number 37845 <br /> QC Report Matrix Spike/ Matrix Spike Duplicate Date 04/13/2004 <br /> Project Name Cox +Cox - 595 E. 11th <br /> Project Number <br /> Duplicate Spiked <br /> Duplicate Spiked Spiked Sample Relative <br /> Spike Spiked Spiked Analysis Date Percent PSample Sample Relative Percent Percent <br /> Spiked Sample Spike Dup Sample Sample ercent Percent Recov Diff <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov . Recov Diff Limit Limit <br /> Benzene 37846-10 <0 0050 00395 00400 00340 00345 mg/Kg EPA 8260B 4112104 86 0 862 0207 70-130 25 <br /> Toluene 37846-10 <0 0050 00395 00400 00329 00332 mg/Kg EPA 82608 4/12104 832 831 0 104 70-130 25 <br /> Tert-Butanol 37846-10 <0 0050 0 198 0200 0 163 0 154 mg/Kg EPA 82606 4112104 825 769 707 70-130 25 <br /> Methyl-t-Butyl Ether 37846-10 <0 0050 00395 00400 00328 00334 mg/Kg EPA 82606 4112104 83 0 834 0 503 70-130 25 <br /> Approved Byio iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />