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i Report Number : 43080 QC Report : Matrix Spike/Matrix Spike Duplicate Date : 4/4/2005 Project Name : Sanchez-Sewer-Stark Project Number: Sanchez-Sewer Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup. Sample Sample Analysis Date Percent Percent Recov. Diff.Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff, Limit Limit Benzene 43080-01 1100 40.0 40.0 1050 1030 ug/L EPA 8260B 411/05 0.00 0.00 0,00 70-130 25 Toluene 43080-01 210 40.0 40.0 244 240 ug/L EPA 82606 4/1105 85.1 75.4 12.0 70-130 25 Tert-Butanol 43080-01 5.5 200 200 198 200 ug/L EPA 82608 4/1105 96.3 97.5 125 70-130 25 MethI-t-But I Ether 43080-01 Y Y 19 40.0 41.0 56.6 57.6 uglL EPA 62646 411105 93.2 96.2 3.15 70-130 25 Benzene 43073-01 <0.50 40.0 40.0 40.2 39.4 ug/L EPA 82608 412105 100 98.6 1.96 70-130 25 Toluene 43073-01 <0.50 40.0 40.0 39.5 38.5 ug/L EPA 82606 412105 98.7 96.3 2.47 70-130 25 Tert-Butanol 43073-01 <5.0 200 200 191 192 ug/L EPA 8260B 4/2/05 95.5 95.9 0.384 70-130 25 Methyl-t-Butyl Ether 43073-01 <0.50 40.0 40.0 39.9 39.5 ug/L EPA 82608 412/05 99.8 98.6 1.19 70-130 25 I Benzene 43084-02 <0.50 40.0 40.0 37.6 36.3 ug/L EPA 8260B 412/05 94.1 90.8 3.54 70-130 25 j Toluene 43084-02 <0.50 40.0 40.0 34.2 33.8 ug/L EPA 8260E 412105 85.6 84.6 1.14 70-130 25 Tert-Butanol 43084-02 <5.0 200 200 180 180 ug/L EPA 8260E 4/2/05 89.9 89.9 0.00695 70-130 25 Methyl-t-Butyl Ether43084-02 <0.50 40.0 40.0 39A 38,3 ug/L EPA 8260E 4/2/05 98.5 95.7 2.89 70-130 25 i Approved By: Joe iff f<IFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800