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Report Number: 30878 QC Report : Matrix Spike/MMatrix Spike Duplicate Date : 1/1412003 Project Name : 341 East Main Street, Project Number: 030107-RM-1 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 Benzene 30878-01 <0.50 39.8 39.3 44.0 43.5 ug/L EPA 8260B 1113103 1110 111 0.0904 70-130 25 Toluene 30878-01 <0.50 39.8 39.3 40.2 39.8 ug/L EPA 8260B 1113103 X101 101 0.247 70-130 25 Tert-Butanol 30878-01 <5.0 199 196 198 197 ug/L EPA 8260B 1113103 99.2 100 1.26 70-130 25 Methyl-t-Butyl Ether 30878-01 <0.50 39.8 39.3 40.1 39.1 ug/L EPA 8260B 1113103 t1 99.5 1.22 70-130 25 i Benzene 30873-02 <0.50 40.0 40.0 36.7 35.5 ug/L EPA 8260B 1112103 X91.7 88.8 3.21 70-130 25 Toluene 30873-02 <0.50 40.0 40.0 35.0 35.1 ug/L EPA 8260B 1112103 87.6 87.8 0.285 70-130 25 1 Tert-Butanol 30873-02 <5.0 200 200 185 186 ug/L EPA 8260E 1112103 92.6 93.3 0.715 70-130 25 Methyl-t-Butyl Ether 30873-02 7.3 40.0 40.0 47.4 45.8 ug/L EPA 8260B 1112103 100 96.4 4.11 70-130 25 Benzene 30871-02 <0.50 40.0 40.0 41.0 40.2 ug/L EPA 8260B 1113103 ��02 100 2.14 70-130 25 Toluene 30871-02 <0.50 40.0 40.0 39.6 38.7 ug/L EPA 8260B 1113103 99.1 96.8 2.32 70-130 25 Tert-Butanol 30871-02 <5.0 200 200 203 206 ug/L EPA 8260B 1113103 ;102 103 1.59 70-130 25 Methyl-t-Butyl Ether 30871-02 270 40.0 40.0 310 308 ug/L EPA 8260B 1113103 91.2 87.6 4.06 70-130 25 i I Approved sy: J I Kiff KIFF AN #ICAL, LLC 2795 2nd St, Suite 3003is, CA 95616 530-297-4800 •