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i <br /> 4 i <br /> I <br /> Report Number 28938 <br /> QC Report . Matrix Spike/Matrix Spike Duplicate Date 10/11/02 <br /> I <br /> I <br /> Project Name 440 W. Charter Way, <br /> Project Number 020927-JB1 <br /> f ' <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 11 Value Units Method Analyzed Recov Recov Diff Limit Limit <br /> Benzene 28879-04 21 49 8 500 5f1 2 510 ug/L EPA 82608 1017102 988 979 0 894 70-130 25 <br /> Toluene 28879-04 63 498 500 979 973 ug/L EPA 8260B 10/7102 700 684 230 70-130 25 <br /> Tert-Butanol 28879-04 <5 0 249 250 244 254 ug/L EPA 8260E 10/7102 982 102 362 70-130 25 <br /> I Methyl-t-Butyl Ether 28879-04 <0 50 498 50 0 1 492 504 ug/L EPA 8260E 10/7102 988 101 198 70-130 25 <br /> I 9 <br /> Benzene 28955-02 <0 50 400 400 393 386 ug1L EPA 8260B 1016102 984 965 1 90 70-130 25 <br /> Toluene 28955-02 <0 50 400 400 '1' 36 3 365 ug/L EPA 82608 1016102 908 912 0 467 70-130 25 <br /> Tert-Butanol 28955-02 <5 0 200 200 227 224 ug/L EPA 8260B 10!6102 113 112 146 70-130 25 <br /> Methyl-t-Butyl Ether 28955-02 <0 50 400 400 33 6 335 ug/L EPA 8260B 1016102 84 0 837 0 358 70-130 25 <br /> Benzene 29003-02 99 400 400 1148 139 ug/L EPA 8260B 1019102 122 98 7 21 3 70-130 25 <br /> Toluene 29003-02 12 400 400 55 7 52 8 ug/L EPA 8260B 1019102 109 102 670 70-130 25 <br /> Tert-Butanol 29003-02 <5 0 200 200 210 218 ug/L EPA 8260B 1019102 105 109 3 53 70-130 25 <br /> Methyl-t-Butyl Ether 29003-02 13 400 400 45 3 443 ug/L EPA 8260B 1019102 110 108 2 36 70-130 25 <br /> i <br /> I <br /> { <br /> ,I <br /> I <br /> r <br />� I <br /> i <br /> F <br /> ti <br /> 1' Approved By J I Kiff <br /> • MKIFF ANALYTICAL, LLC <br /> 2795 2nd St, Suite 300 leis, CA 95616 530-297-4800 <br />