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Report Number: 47749 QC Report : Matrix Spikel Matrix Spike Duplicate Date -. 1/9/2006 { Project Name : Beacon Project Number: 3641 Stockton 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 Percent Recov. Diff, Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff. Limit Limit Benzene 47720-02 <0.50 39.6 38.7 41.0 40.6 ug/L EPA 82606 1/5106 103 105 1.49 70-130 25 Toluene 47720-02 <0.50 39.6 38.7 37.2 37.0 ug/L EPA 8260B 115106 93.9 95.6 1.82 70-130 25 Tert-Butanol 47720-02 <5.0 198 193 209 202 ug/L EPA 8260B 115106 h06 104 1.03 70-130 25 Methyl-t-Butyl Ether47720-02 <0.50 39.6 38.7 37.7 37.8 ug/L EPA 82608 115106 95.2 97.8 2.63 70-130 25 Benzene 47750-06 <0.50 40.0 40.0 44.4 43.4 ug/L EPA 82606 114106 111 108 2.25 70-130 25 Toluene 47750-06 0.80 40.0 40.0 43.0 42.2 uglL EPA 8260B 1/4/06 105 103 1.86 70-130 25 Tert-Butanol 47750-06 <5.0 200 200 210 213 ug/L EPA 82606 114/06 105 106 1.46 70-130 25 Methyl-t-Butyl Ether47750-06 <0.50 40.0 40.0 42.1 41.8 ug/L EPA 82606 114106 105 104 0.810 70-130 25 Benzene 47750-05 0.58 40.0 40.0 45.1 44.7 ug1L EPA 82606 114106 111 110 0.877 70-130 25 Toluene 47750-05 <0.50 40.0 40.0 40.8 40.8 ug/L EPA 82606 1/4106 102 102 0.131 70-130 25 Tert-Butanol 47750-05 <5.0 200 200 205 206 ug/L EPA 82606 114106 102 103 0.222 70-130 25 Methyl-t-Butyl Ether 47750-05 4.8 40.0 40.0 46.2 46.0 ug/L EPA 82608 114106 104 103 0.660 70-130 25 I + Approved By: Joe iff KIFF ANf �TICAL, LLC 2795 2nd St, Suite 300 l�avis, CA 95616 530-297-4800