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Report Number 23404 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date 11/28/2001 <br /> Project Name 7910 Lower Sacramento <br /> Project Number 011114-JB1 <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 /> Spike Recovery Data <br /> Benzene 23391-01 <0 50 39 0 38 2 414 406 ug/L EPA 8260B 11116/200106 106 000 70-130 25 <br /> Toluene 23391-01 <0 50 39 0 382 384 379 ug/L EPA 82608 11116120098 4 99 2 0 810 70-130 25 <br /> Tert-Butanol 23391-01 <5 0 195 191 203 192 ug/L EPA 8260B 111161200104 100 3 71 70-130 25 <br /> Methyl-t-Butyl Ether 23391-01 14 390 382 533 524 ug/L EPA 82608 111161200101 101 0167 70-130 25 <br /> i <br /> 1CAL, LLC <br /> KIFF AN <br /> Approved By J I Kitt = <br /> 720 Olive Drive, Suite [avis, CA 95616 530-297-4800 • <br />