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0 9 Report Number 460 <br /> QC Report Matrix Spike/Matrix Spike Duplicate Date 11/412005 <br /> Project Name 7-Eleven Store #17334 <br /> Project Number 77EL 17334.05 <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 Lima <br /> Benzene 46699-06 <0 50 400 400 41 8 406 ug/L EPA 82608 1112105 104 102 291 70-130 25 <br /> Toluene 46699-06 <0 50 400 400 405 397 ug/L EPA 8260B 1112105 101 992 1 97 70-130 25 <br /> Tert-Butanol 46699-06 <5 0 200 200 240 238 ug/L EPA 82608 1112105 120 119 0 808 70-130 25 <br /> Methyl-t-Butyl Ether 46699-06 <0 50 400 400 404 407 ug/L EPA 8260E 1112105 101 102 0 779 70-130 25 <br /> Benzene 46687-05 0 81 400 400 494 481 ug/L EPA 82608 1111105 121 118 2 65 70-130 25 <br /> Toluene 46687-05 1 9 400 400 499 489 ug/L EPA 8260B 1111105 120 117 210 70-130 25 <br /> Tert-Butanol 46687-05 <5 0 200 200 248 247 ug/L EPA 8260E 1111105 124 124 0 545 70-130 25 <br /> Methyl-t-Butyl Ether46687-05 <0 50 400 400 463 459 ug/L EPA 82608 1111105 116 115 0 719 70-130 25 <br /> Benzene 46687-01 <0 50 400 400 468 433 ug/L EPA 8260B 1111105 117 108 780 70-130 25 <br /> Toluene 46687-01 <0 50 400 400 472 435 ug/L EPA 8260E 1111105 118 109 818 70-130 25 <br /> Tert-Butanol 46687-01 <5 0 200 200 249 234 ug/L EPA 82608 1111105 124 117 608 70-130 25 <br /> Methyl-t-Butyl Ether 46687-01 <0 50 400 400 440 409 ug/L EPA 82608 1111105 110 102 719 70-130 25 <br /> Benzene 46683-02 <0 50 400 400 466 461 ug/L EPA 8260B 1111105 116 115 104 70-130 25 <br /> Toluene 46683-02 <0 50 400 400 464 459 ug/L EPA 8260B 1111105 116 115 106 70-130 25 <br /> Tert-Butanol 46683-02 <5 0 200 200 236 235 ug/L EPA 82608 1111105 118 117 0 784 70-130 25 <br /> Methyl-t-Butyl Ether 46683-02 38 400 400 494 501 ug/L EPA 8260B 1111105 114 116 146 70-130 25 <br /> Benzene 46687-03 1 1 400 400 464 461 ug/L EPA 8260E 1111105 113 113 0 603 70-130 25 <br /> Toluene 46687-03 <0 50 400 400 455 452 ug/L EPA 82608 1111105 114 113 0 794 70-130 25 <br /> Approved By Jo iff <br /> KIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 <br />