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I <br /> Report Number 23766 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 1211412001 <br /> Project Name JUAN ROBLES <br /> Project Number 3490 <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 Daff Limit Limit <br /> Spike Recovery Data <br /> Benzene 23766-01 <0 50 400 400 41 4 404 ug1L EPA 8260E 121111200104 101 262 70-130 25 <br /> Toluene 23766-01 <0 50 400 400 41 6 406 uglL EPA 82608 121111200104 102 248 70-130 25 <br /> Tert-Butanof 23766-01 <5 0 200 200 186 195 ug1L EPA 82608 12111120093 2 976 4 70 70-130 25 <br /> Methyl-t-Butyl Ether 23766-01 072 400 400 435 434 uglL EPA 8260B 121111200107 107 0 421 70-130 25 <br /> Approved By Joel Kiff y' <br /> KIFF ANALYTICAL LLC <br />