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• i i Report Number 40547 QC Report Matrix Spike/Matrix Spike Duplicate Date 12/21/2004 Project Name 7-Eleven Store #20632 Project Number 77EL 20632 03 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 40545-08 1 8 384 382 41 5 425 ug/L EPA 82608 10/16104 103 106 286 70-130 25 Toluene 40545-08 <0 50 384 382 391 401 ug/L EPA 8260B 10/16/04 102 105 2 99 70-130 25 Tert-Butanol 40545-08 <50 192 191 215 218 ug/L EPA 82606 10/16/04 112 114 2 04 70-130 25 Methyl-t-Butyl Ether40545-08 13 38 4 382 522 521 ug/L EPA 8260B 10/16/04 101 101 0 250 70-130 25 Benzene 40544-02 20 400 400 51 1 514 ug/L EPA 8260E 10/14/04 789 795 0 722 70-130 25 Toluene 40544-02 <0 50 400 400 392 39 2 ug/L EPA 82608 10/14/04 98 0 981 0 179 70-130 25 Tert-Butanol 40544-02 17 200 200 208 213 ug/L EPA 8260B 10/14104 956 981 249 70-130 25 Methyl-t-Butyl Ether40544-02 280 400 400 307 307 ug/L EPA 82606 10/14/04 697 705 1 19 70-130 25 Benzene 40535-01 27 400 400 706 69 0 ug/L EPA 8260B 10/15/04 108 104 3 72 70-130 25 Toluene 40535-01 3 0 400 400 42 6 423 ug/L EPA 8260B 10/15/04 991 982 0 914 70-130 25 Tert-Butanol 40535-01 <5 0 200 200 194 194 ug/L EPA 82606 10/15/04 972 968 0 414 70-130 25 Methyl-t-Butyl Ether 40535-01 <0 50 400 400 422 423 ug/L EPA 82606 10/15/04 106 106 0 239 70-130 25 Benzene 40596-08 <0 50 400 400 400 391 ug/L EPA 82606 10/18/04 999 978 212 70-130 25 Toluene 40596-08 <0 50 400 400 393 385 ug1L EPA 82606 10/18/04 984 962 223 70-130 25 Tert-Butanol 40596-08 <5 0 200 200 193 194 ug/L EPA 8260B 10/18/04 966 973 0 678 70-130 25 Methyl-t-Butyl Ether40596-08 <0 50 400 400 414 407 ug/L EPA 8260B 10/18/04 103 102 162 70-130 25 Approved By Jo Iff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800