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Report Number. 29151 QC Report : Matrix Spike/Matrix Spike Duplicate Date : 10/17/02 Project Name : 349 East Main Street, Project Number: 021009-JB1 Du licate 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 Anal ed!Recov. Recon. Diff. Limit Limit Benzene 29178-02 <0'50 40.0 40.0 41.4 40.9 ug/L EPA 82608 10/16/02 X103 102 1.07 70-130 25 Toluene 29178-02 <050 40.0 40.0 38.9 38.0 ug/L EPA 82608 10/16/02 .97.2 95.0 2.31 70-130 25 Tert-Butanol 29178-02 <5.0 200 200 210 210 ug/L EPA 8260B 10/16/02 11 0 05 105 0.0572 70-130 25 Methyl-t-Butyl Ether29178-02 450 40.0 40.0 381 384 ug/L EPA 82608 10/16/02 :0.00 0.00 0.00 70-130 25 Benzene 29145-01 2.7 40.0 40.0 46.2 45.0 ug/L EPA 8260B 10/15/02 109 106 2.91 70-130 25 Toluene 29145-01 0.73 40.0 40.0 43.6 42.2 ug/L EPA 8260B 10/15/02 07 104 3.23 70-130 25 Tert Butanol 29145-01 110 200 200 314 298 ug/L EPA 8260E 10115102101 92.7 8.63 70-130 25 Methyl-t-Butyl Ether 29145-01 50 40.0 40.0 91.9 89.0 ug/L EPA 8260E 10/15/02 .I 05 97.7 7.11 70-130 25 Benzene 29149-01 <0.50 40.0 40.0 44.1 43.3 ug/L EPA 82608 10/16/02 ��10 108 1.94 70-130 25 Toluene 29149-01 <0.50 40.0 40.0 42.7 40.8 ug/L EPA 82608 10/16/02 i�07 102 4.45 70-130 25 Tert-Butanol 29149-01 <5.0 200 200 201 192 ug/L EPA 8260B 10/16/02 00 96.1 4.42 70-130 25 Methyl-t-Butyl Ether 29149-01 <0.50 40.0 40.0 45.4 44.6 ug/L EPA 82608 10/16/02 113 112 1.56 70-130 25 I � Approved 8y: JO I Kiff AN /CAL, LLC 2795 2nd St, S Suite 300vis, CA 95616 530-297-4800