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Report Number: 48017 QC Report: Matrix Spike/Matrix Spike Duplicate Date: 1/26/2006 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 48019-02 <0.50 39.6 39.3 41.4 41.7 ug/L EPA 8260B 1124106 105 106 1.51 70-130 25 Toluene 48019-02 <0.50 39.6 39.3 38.6 38.6 ug/L EPA 8260B 1124106 97.4 98.3 0.865 70-130 25 Tert-Butanol 48019-02 <5.0 198 196 201 198 ug/L EPA 8260B 1124106 101 101 0.876 70-130 25 Methyl-t-Butyl Ether 48019-02 <0.50 39.6 39.3 42.0 42.0 ug/L EPA 82608 1124106 106 107 0.843 70-130 25 Benzene 47994-01 <0.50 39.6 39.2 45.7 4&0 ug/L EPA 8260B 1125106 115 117 1.53 70-130 25 Toluene 47994-01 <0.50 39.6 39.2 42.7 43.0 ug/L EPA 8260B 1125106 108 110 1.66 70-130 25 <5.0 198 196 205 202 u Tert-Butanol 47994-01 91L EPA 8260B 1/25106 104 103 0.678 70-130 25 Methyl-t-Butyl Ether 47994-01 <0.50 39.6 39.2 38.2 38.1 ug/L EPA 8260B 1125106 96A 97.1 0.757 70-130 25 Benzene 48048-06 <0.50 40.0 40.0 43.0 42.7 ug/L EPA 8260B 1125106 108 107 0.773 70-130 25 Toluene 48048-06 <0.50 40.0 40.0 41.5 41.8 ug/L EPA 82608 1125106 104 105 0.743 70-130 25 Tert-Butanol 48048-06 <5.0 200 200 204 206 ug/t_ EPA 8260B 1125106 102 103 1.00 70-130 25 Methyl-t-Butyl Ether 48048-06 0.63 40.0 40.0 43.0 44.3 ug/L EPA 8260B 1125106 106 109 3.08 70-130 25 i Benzene 48017-06 <0.50 40.0 40.0 40.7 40.3 ug/L EPA 8260B 1124106 102 101 1.18 70-130 25 Toluene 48017-06 <0.50 40.0 40.0 38.6 38.0 ug/L EPA 8260B 1124106 96.5 95.1 1.50 70-130 25 Tert-Butanol 48017-06 <5.0 200 200 209 209 ug/L EPA 8260B 1124106 104 104 0.0170 70-130 25 Methyl-t-Butyl Ether48017-06 0.61 40.0 40.0 37.9 39.2 ug/L EPA 8260B 1124106 93.2 96.4 3.37 70-130 25 I t Approved By: Jo ff KIFF ANALYTICAL, LLC � 2795 2nd St, Suite 300 Davis, CA 95616 530-2974800