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a. <br /> Report Number: 23766 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date 12/14/2001 <br /> f <br /> N <br /> Project <br /> � Name : JUAN ROBLES <br /> Project Number : 3490 <br /> Duplicate Duplicate Spiked <br /> Spike Spiked Spled Spiked Spiked Sample Relative <br /> Spiked Sample Spike Dup. Sample Sample Analysis Date PercSament le Sample <br /> Percent Re ovist Percent <br /> Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff, Limit Limit <br /> Spike Recovery Data <br /> Benzene 23766-01 <0.50 40.0 40.0 41.4 40.4 ug/L EPA 8260B 12/111200104 101 2.62 70-130 25 <br /> Toluene 23766-01 <0.50 40.0 40.0 41.6 40.6 ug/L EPA 8260B 121111200104 102 2.48 70-130 25 <br /> Tert-Butanol 23766-01 <5.0 200 200 186 195 ug/L EPA 82608 12111/20093.2 97.6 4.70 70-130 25 <br /> Methyl-t-Butyl Ether 23766-01 0.72 40.0 40.0 43.5 43.4 ug1L EPA 8260B 121111200107 107 0.421 70-130 25 <br /> 4u <br /> KIFF ANALYTICAL, LLC Approved By: Joel Kiff <br /> 7�( (),ive nrive c,itq n navis. C 11 p5Fi16 .510-707-49()(1 r <br />