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Report Number 33916 QC Report Matrix Spike/Matrix Spike Duplicate Date 7/8/2003 Project Name 7-Eleven Store #99976 Protect Number 77EL.19976 03 Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup Sample Sample Analys[s Date Percent Percent Percent Recov Diff Parameter Sample Value Level Level Value Value Units Method Analyzed Recov Recov Diff _Limit Limit Benzene 33916-03 1100 400 400 1010 945 ug/L EPA 82606 714103 000 000 000 70-130 25 Toluene 33916-03 940 400 400 832 777 ug/L EPA 82608 714103 000 000 000 70-130 25 Tert-Butanol 33916-03 1200 200 200 1340 1320 ug/L EPA 8260B 7/4/03 885 776 131 70-130 25 Methyl-t-Butyl Ether 33916-03 1500 400 400 1430 1360 ug/L EPA 82606 714103 000 000 000 70-130 25 Benzene 33909-02 <0 50 400 400 41 6 405 ug/L EPA 82606 7/1/03 104 101 273 70-130 25 Toluene 33909-02 <0 50 400 400 41 4 403 ug/L EPA 82606 7/1103 103 101 2 54 70-130 25 Tert-Butanol 33909-02 <5 0 200 200 202 203 ug/L EPA 82606 711/03 101 102 0 637 70-130 25 Methyl-t-Butyl Ether 33909-02 37 400 400 51 9 497 ug/L EPA 8260B 7/1/03 120 115 478 70-130 25 Benzene 33882-06 <0 50 400 400 37 5 424 ug/L EPA 8260B 7/1/03 938 106 124 70-130 25 Toluene 33882-06 <0 50 400 400 381 430 ug/L EPA 8260B 711103 952 108 122 70-130 25 Tert-Butanol 33882-06 <5 0 200 200 192 228 ug/L EPA 8260B 711/03 962 114 168 70-130 25 Methyl-t-Butyl Ether 33882-06 <0 50 400 400 39 3 468 ug/L EPA 82606 711103 983 117 173 70-130 25 Benzene 33909-03 <0 50 400 400 41 6 41 0 ug/L EPA 8260B 711103 104 102 1 33 70-130 25 Toluene 33909-03 <0 50 400 400 404 39 9 ug/L EPA 8260B 711/03 101 998 1 27 70-130 25 Tert-Butanol 33909-03 <5 0 200 200 207 204 ug/L EPA 8260B 711103 103 102 1 04 70-130 25 Methyl-t-Butyl Ether 33909-03 <0 50 400 400 38 6 39 3 ug/L EPA 82608 711103 966 98 3 1 74 70-130 25 Approved By 16el Kiff KIFF ANALYTICAL, LLC 1 1 2795 2nd St, Suite 300 9s, CA 95616 530-297-4800 ' . N