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Report Number: 35108 <br /> QC Report: Matrix Spike/Matrix Spike Duplicate Date : 9130/2003 <br /> Project Name : STEFANO'S <br /> Project Number: <br /> Duplicate Spiked <br /> Duplicate SpikedSpiked 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 35135-20 <0.50 40.0 40.0 40.3 38.6 ugIL EPA 8260B 9126103 101 96.6 4.23 70-130 25 <br /> Toluene 35135-20 <0.50 40.0 40.0 41.5 39.8 ug/L EPA 82608 9126103 104 99.6 3.98 70-130 25 <br /> Tert-Butanol 35135-20 <5.0 200 200 197 203 ug/L EPA 8260B 9126103 98.4 101 2.97 70-130 25 <br /> Methyl-t-Butyl Ether 35135-20 10 40.0 40.0 48.9 48.0 ug/L EPA 8260B 9126103 96.8 94.6 2.38 70-130 25 <br /> Benzene 35074-01 <0.50 40.0 40.0 40.0 38.8 ug/L EPA 8260B 9125103 100 97.0 2.99 70-130 25 <br /> Toluene 35074-01 <0.50 40.0 40.0 39.3 37.5 ug/L EPA 82608 9125103 98.2 93.8 4.66 70-130 25 <br /> Tert-Butanol 35074-01 <5.0 200 200 211 212 ug/L EPA 82606 9125103 105 106 0.407 70-130 25 <br /> Methyl-t-Butyl Ether 35074-01 <0.50 40.0 40.0 42.2 40.6 uglL EPA 8260B 9125103 105 102 3.70 70-130 25 <br /> Benzene 35171-05 <0.50 40.0 40.0 39.4 39.8 ug/L EPA 8260B 9129103 98.4 99.5 1.08 70-130 25 <br /> Toluene 35171-05 <0.50 40.0 40.0 38.6 35.3 ug/L EPA 8260E 9129103 96.6 88.2 8.98 70-130 25 <br /> Tort-Butanol 35171-05 <5.0 200 200 208 211 ug/L EPA 82606 9129103 104 106 1.63 70-130 25 <br /> Methyl-t-Butyl Ether 35171-05 <0.50 40.0 40.0 43.0 41.2 ug/L EPA 8260B 9129103 107 103 4.18 70-130 25 <br /> Benzene 35108-01 <0.50 40.0 40.0 40.4 40.2 ug/L EPA 8260B 9125103 101 100 0.472 70-130 25 <br /> Toluene 35108-01 <0.50 40.0 40.0 41.0 40.2 ug/L EPA 82608 9125103 102 101 1.87 70-130 25 <br /> Tert-Butanol 35108-01 <5.0 200 200 195 210 ug/l_ EPA 8260B 9125103 97.4 105 7.33 70-130 25 <br /> Methyl-t-Butyl Ether 35108-01 <0.50 40.0 40.0 41.8 43.4 ug/L EPA 8260B 9125103 105 108 3.54 70-130 25 <br /> 4 <br /> Approved By: J I <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 �„ <br />