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Report Number: 35095 , QC Report : Matrix Spike/Matrix Spike Duplicate Date : 9/30/2003 Project Name : STEFANO Project Number 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 1,1-Dichloroethane 35095-01 <0.50 39.5 39.8 43.0 44.0 ug/L. EPA 8260B 9129103 109 110 1.48 70-130 25 Benzene 35095-01 <0.50 39.5 39.8 40.3 41.0 ug/L EPA 8260B 9129103 102 103 0.708 70-130 25 14,_ 1,2-Dichloroethane 35095-01 <0.50 39.5 39.8 43.9 42.9 uglL EPA 8260B 9129103 111 108 2.92 70-130 25 - o uene 35095-01- <0.50- "39.-5' ' 39.8 L- - 42.1 -- 42-.7-- ugll. EPA 82606- 9129103' 106 J07' 0.562 70-130 25 Chlorobenzene 35095-01 <0.50 39.5 39.8 43.2 44.9 uglL EPA 82606 9129103 109 113 3.13 70-130 25 Tert-Butanol 35095-01 <5.0 198 199 194 186 ug/L EPA 82606 9129103 97.9 93.4 4.72 70-130 25 Methyl-t-Butyl Ether 35095-01 <0.50 39.5 39.8 40.0 39.4 ug/L EPA 8260E 9129103 101. 99.0 2.12 70-130 25 1,1-Dichloroethane 35139-01 <0.50 40.0 40.0 42.7 41.9 uglL EPA 8260B 9129103 107 105 2.03 70-130 25 Benzene 35139-01 .<0.50. 40.0 40.0 . 41.4 40.8 uglL EPA 82606 9129103 103 102 1.31 70-130 25 1,2-Dichloroethane 35139-01 <0.50 40.0 40.0 39.9 39.2 uglL EPA 82608 - 9129103 99.8 98.0 1.84 70-130 25 Toluene 35139-01 <0.50 40.0 40.0 41.2 41.0 ug/L. EPA 8260B 9129103 103 102 0.512 70-130 25 Chlorobenzene 35139-01 <0.50 40.0 40.0 40.1 40.5 ug/L. EPA 82606-. ,9129103 , 100 . 1:01 0.918 70-130 .25- _. _ ... . ._ - -. - Tert-Butanol 35139-01 <5.0 200 200 203 203 ug/L EPA 8260B, 9129103 102__ 1--02._- 0.0344-.70-130---25;.. Methyl-t-Butyl Ether 35139-01 <0.50 40.0 40.0 40.2 38.8 uglL EPA 8260E 9129103 100 97.1 3.34 70-130 25 1 KIFF ANALYTICAL, LLC Approved By: jJ I f 27952nd St, Suite 300 Davis, CA 95616 530-297-4800 I