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0 • Report Number 21#9 QC Report: Matrix Spike/Matrix Spike Duplicate Date 19/5/2002 Project Name 3725 South Tracy Project Number 021028-JB1 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 Sam le Value Level Level Value Value Units Method Anal ed Recov Recov Diff Limit Limit Benzene 29464-02 2 5 200 199 221 21 7 ug/L EPA 8260B 1113102 98 0 968 1 19 70-130 25 Toluene 29464-02 <0 50 200 199 197 193 ug/L EPA 82606 1113/02 984 973 105 70-130 25 Tert-Butanol 29464-02 <5 0 100 993 107 105 ug/L EPA 8260B 1113102 107 106 148 70-130 25 Methyl4-Butyl Ether 29464-02 94 20 0 199 118 112 ug/L EPA 8260B 1113102 119 907 271 70-130 25 Benzene 29449-04 0 64 400 400 368 432 ug/L EPA 8260B 1111/02 905 106 160 70-130 25 Toluene 29449-04 <0 50 400 400 368 432 ug/L EPA 8260B 1111/02 921 108 158 70-130 25 Tert-Butanol 29449-04 <5 0 200 200 187 214 ug/L EPA 8260B 1111102 937 107 133 70-130 25 Methyl-t-Butyl Ether 29449-04 32 400 400 723 804 ug1L EPA 82608 11/1102 100 121 183 70-130 25 Benzene 29466-02 <0 50 400 400 404 390 ug/L EPA 8260B 1111/02 101 976 357 70-130 25 Toluene 29466-02 <0 50 400 400 399 38 6 ug/l_ EPA 8260B 1111102 99 8 966 3 26 70-130 25 Tert-Butanol 29466-02 <5 0 200 200 207 202 ug/L EPA 82606 11/1/02 104 101 2 53 70-130 25 Methyl-t-Butyl Ether 29466-02 <0 50 400 400 391 384 ug/L EPA 8260B 1111102 977 961 165 70-130 25 Benzene 29468-01 <0 50 400 400 393 392 ug/L EPA 82606 1112102 983 981 0204 70-130 25 Toluene 29468-01 <0 50 400 400 395 390 ug/L EPA 82606 1112102 987 976 115 70-130 25 Tert-Butanol 29468-01 <5 0 200 200 211 196 ug/L EPA 82606 1112102 106 979 758 70-130 25 Methyl-t-Butyl Ether 29468-01 <0 50 400 400 38 0 38 0 ug/L EPA 82606 1112102 94 9 950 00790 70-130 25 J KIFF ANALYTICAL, LLC Approved By J I Koff 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800