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Report Number: 37171 QC Report : Matrix Spike/Matrix Spike Duplicate Date : 2/27/2004 Project Name : COX + COX 595 E. 11TH 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 37068-08 <0.50 40.0 40.0 37.4 36.3 ug/L EPA 8260B 2/26/04 93.6 90.8 3.13 70-130 25 Benzene 37068-08 <0.50 40.0 40.0 39.4 38.0 ug/L EPA 8260B 2/26/04 98.4 95.1 3.39 70-130 25 _. 1,2-Dichloroethane 37068-08 <0.50 40.0 40.0 38.8 37.9 ug/L EPA 8260B 2/26/04 97.0 94.8 2.33 70-130 25 Toluene 37068-08 <0.50 40.0 40.0 38.6 37.8 ug/L EPA 8260B 2/26/04 96.5 94.4 2.19 70-130 25 Chlorobenzene 37068-08 <0.50 40.0 40.0 38.1 37.3 ug/L EPA 82608 2/26/04 95.3 93.4 2.03 70-130 25 Tert-Butanol 37068-08 <5.0 200 200 192 195 ug/L EPA 8260B 2/26/04 96.1 97.6 1.47 70-130 25 Methyl-t-Butyl Ether 37068-08 <0.50 40.0 40.0 37.5 37.6 ug/L EPA 8260B 2/26/04 93.8 93.9 0.0842 70-130 25 1,1-Dichloroethane 37159-05 <0.50 40.0 40.0 38.8 38.6 ug/L EPA 8260B 2/27/04 96.9 96.5 0.392 70-130 25 Benzene 37159-05 <0.50 40.0 40.0 42.0 40.7 ug/L EPA 8260B 2/27/04 105 102 3.31 70-130 25 1,2-Dichloroethane 37159-05 <0.50 40.0 40.0 40.8 40.3 ug/L EPA 8260B 2/27/04 102 101 1.34 70-130 25 Toluene 37159-05 <0.50 40.0 40.0 46.5 42.2 ug/L EPA 8260B 2/27/04 116 106 9.57 70-130 25 Chlorobenzene 37159-05 <0.50 40.0 40.0 43.6 42.8 ug/L EPA 8260B 2/27/04 109 107 1.92 70-130 25 Tert-Butanol 37159-05 <5.0 200 200 195 187 ug/L EPA 8260B 2/27/04 97.5 93.4 4.26 70-130 25 Methyl-t-Butyl Ether 37159-05 <0.50 40.0 40.0 38.5 37.9 ug/L EPA 8260B 2/27/04 96.2 94.8 1.55 70-130 25 KIFF ANALYTICAL, LLC Approved By: R P Furry 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800