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Report Number: 56273 <br /> QC Report : Matrix Spike/Matrix Spike Duplicate Date : 5/8/2007 <br /> Project Name : 7-Eleven Store #14117 <br /> Project Number: 77EL.14117.07 <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 56275-08 <0.50 40.0 40.0 40.6 39.7 ug/L EPA 8260B 5/4/07 101 99.3 2.06 70-130 25 <br /> Toluene 56275-08 <0.50 40.0 40.0 39.4 38.4 ug/L EPA 8260B 5/4/07 98.5 96.1 2.47 70-130 25 <br /> Tert-Butanol 56275-08 <5.0 200 200 202 191 ug/L EPA.8260B 5/4/07 101 95.5 5.64 70-130 25 <br /> Methyl-t-Butyl Ether 56275-08 <0.50 40.0 40.0 40.7 40.9 ug/L EPA 8260B 5/4/07 102 102 0.481 70-130 25 <br /> Benzene 56273-02 3.7 40.0 40.0 45.8 45.0 ug/L EPA 8260B 5/4/07 .105 103 1.99 70-130 25 <br /> Toluene 56273-02 <0.50 40.0 40.0 41.3 41.0 ug/L EPA 8260B .5/4/07 103 102 0.684 70-130 25 <br /> Tert-Butanol 56273-02 130 200 200 348 339 ug/L EPA 82606 5/4/07 107 102 4.66 70-130 25 <br /> Methyl-t-Butyl Ether 56273-02 4.4 40.0 40.0 45.0 44.9 ug/L EPA 8260B 5/4/07 101 101 0.257 70-130 25 <br /> Benzene 56272-03 <0.50 40.0 40.0 39.7 39.0 ug/L EPA 8260B 5/4/07 99.2 97.4 1.86 70-130 25 <br /> Toluene 56272-03 <0.50 40.0 40.0 39.8 39.1 ug/L EPA 8260B 5/4/07 99.4 97.8 1.68 70-130 25 <br /> Tert-Butanol 56272-03 <5.0 200 200 203 207 ug/L EPA 8260B 5/4/07 101 104 2.06 70-130 25 <br /> Methyl-t-Butyl Ether 56272-03 <0.50 40.0 40.0 37.9 38.2 ug/L EPA 82606 5/4/07 94.8 95.6 0.828 70-130 25 <br /> Benzene 56273-03 6.6 40.0 40.0 46.0 45.0 ug/L EPA 8260B 5/4/07 98.5 96.0 2.57 70-130 25 <br /> Toluene 56273-03 2.8 40.0 40.0 42.2 41.5 ug/L EPA 8260B 5/4/07 98.7 96.8 1.94 70-130 25 <br /> Tert-Butanol 56273-03 <5.0 200 200 232 230 ug/L EPA 8260B 5/4/07 116 115 0.976 70-130 25 <br /> Methyl-t-Butyl Ether 56273-03 <0.50 40.0 40.0 35.0 34.8 ug/L EPA 8260B 5/4/07 87.4 86.9 0.510 70-130 25 <br /> Benzene 56273-01 <0.50 40.0 40.0 39.1 38.5 ug/L EPA 8260B 5/4/07 97.8 96.2 1.66 70-130 25 <br /> Toluene 56273-01 <0.50 40.0 40.0 40.2 39.4 ug/L EPA 8260B 5/4/07 100 98.4 2.18 70-130 25 <br /> Approved By: Joe iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800 <br />