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Report Number: 28368 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 9/16/2002 <br /> Project Name : Former Beacon 12474 <br /> Project Number: 1474.45 <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 /> Benzene 28370-01 <0.50 39.1 38.8 37.4 37.8 ug/L EPA 82606 9113102 95.8 97.2 1.50 70-130 25 <br /> Toluene 28370-01 <0.50 39.1 38.8 37.1 37.7 ug/L EPA 8260B 9113102 95.0 97.0 2.11 70-130 25 <br /> Tert-Butanol 28370-01 <5.0 195 194 181 190 ug/L EPA 82606 9113102 92.9 97.8 5.19 70-130 25 <br /> Methyl-t-Bucy! Ether 28370-01 <0.50 39.1 38.8 36.2 36.7 ug/L EPA 8260B 9113102 92.6 94.6 2.14 70-130 25 <br /> Benzene 28349-07 <0.50 40.0 40.0 42.4 40.7 ug/L EPA 82608 915102 106 102 4.12 70-130 25 <br /> Toluene 28349-07 <0.50 40.0 40.0 48.0 46.3 ug/L EPA 8260B 915102 120 116 3.56 70-130 25 <br /> Tert-Butanol 28349-07 <5.0 200 200 202 204 ug/L EPA 8260B 915102 101 102 0.922 70-130 25 <br /> Methyl-t-Butyl Ether 28349-07 0.66 40.0 40.0 43.2 42.4 ug/L EPA 8260B 915102 106 104 1.80 70-130 25 <br /> i <br /> Benzene 28368-04 <0.50 40.0 40.0 41.8 42.0 ug/l_ EPA 8260B 917102 104 105 0.406 70-130 25 <br /> Toluene 28368-04 <0.50 40.0 40.0 47.6 48.1 ug/L EPA 8260B 917102 119 120 1.09 70-130 25 <br /> Tert-Butanol 28368-04 <5.0 200 200 208 213 ug/L EPA 8260B 917102 104 106 2.59 70-130 25 <br /> Methyl-t-Butyl Ether 28368-04 <0.50 40.0 40.0 41.3 41.0 ug/L EPA 8260B 917102 103 102 0.728 70-130 25 <br /> Benzene 28244-06 <0.50 40.0 40.0 40.3 39.9 ug1L EPA 8260B 915102 101 99.7 1.02 70-130 25 <br /> Toluene 2824406 <0.50 40.0 40.0 40.8 40.2 ug/L EPA 8260B 915102 102 100 1.31 70-130 25 <br /> Tert-Butanol 28244-06 <5.0 200 200 196 196 ug/L EPA 82606 915102 98.0 98.1 0.132 70-130 25 <br /> Methyl-t-Butyl Ether 28244-06 0.78 40.0 40.0 40.5 40.4 ug/L EPA 82606 915102 99.4 99.1 0.302 70-130 25 <br /> i <br /> Approved By: J6el Kiff <br /> KIFF ANALYTICAL, LLC I `I <br /> 720 Olive Drive, Suite D Davis, CA 95616 530-297-4800 U <br />