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• Report Number: A QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 11/4/2005 Project Name : 7-Eleven Store#20632 Project Number : 77EL.20632.05 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 46680-03 <0.50 40.0 40.0 41.7 38.5 ug/L EPA 82608 10/31/05 104 96.2 8.08 70-130 25 Toluene 46680-03 <0.50 40.0 40.0 41.0 37.9 ug/L EPA 8260E 10/31/05 102 94.8 7.73 70-130 25 Tert-Butanol 46680-03 <5.0 200 200 236 220 ug/L EPA 8260B 10/31/05 118 110 7.38 70-130 25 Methyl-t-Butyl Ether 46680-03 <0.50 40.0 40.0 38.0 35.9 ug/L EPA 82606 10/31/05 95.1 89.8 5.72 70-130 25 Benzene 46699-06 <0.50 40.0 40.0 41.8 40.6 ug/L EPA 8260B 1112105 104 102 2.91 70-130 25 Toluene 46699-06 <0.50 40.0 40.0 40.5 39.7 ug/L EPA 8260B 1112105 101 99.2 1.97 70-130 25 Tert-Butanol 46699-06 <5.0 200 200 240 238 ug/L EPA 82606 1112105 120 119 0.808 70-130 25 Methyl-t-Butyl Ether46699-06 <0.50 40.0 40.0 40.4 40.7 ug/L EPA 82606 1112105 101 102 0.779 70-130 25 Benzene 46686-02 <0.50 40.0 40.0 41.0 40.2 ug/L EPA 82608 10/31/05 102 100 2.02 70-130 25 Toluene 46686-02 <0.50 40.0 40.0 40.8 39.9 ug/L EPA 8260B 10/31/05 102 99.8 2.27 70-130 25 Tert-Butanol 46686-02 <5.0 200 200 209 207 ug/L EPA 8260E 10/31/05 104 103 1.19 70-130 25 Methyl-t-Butyl Ether 46686-02 350 40.0 40.0 390 388 ug/L EPA 8260B 10/31/05 108 104 3.94 70-130 25 I I , i Approved By: Jo iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800