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C Ff - Report Number: 33536 QC Report: Matrix Spike/Matrix Spike Duplicate Date : 6/13/2003 Project Name : 404 WEST FREMONT ST Project Number: 1628.10 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 33546-01 <0.50 40.0 40.0 37.0 36.8 ug/L EPA 8260B 6/7/03 92.6 92.0 0.623 70-130 25 Toluene 33546-01 <0.50 40.0 40.0 38.2 37.9 ug/L EPA 8260B 6/7/03 95.4 94.7 0.736 70-130 25 Tert-Butanol 33546-01 <5.0 200 200 184 182 ug/L EPA 8260B 6/7/03 91.8 91.2 0.738 70-130 25 Methy[+Butyl Ether 33546-01 <0.50 40.0 40.0 40.9- -40.4 - ug/L EPA 82606 -6/7/03 `-102- 101 "1.20 70-130 25 Benzene 33577-08 <0.50 40.0 40.0 38.5 37.9 ug/L EPA 8260B 6/11/03 96.2 94.8 1.47 70-130 25 Toluene 33577-08 <0.50 40.0 40.0 43.0 40.7 ug/L EPA 8260B 6/11/03 108 102 5.44 70-130 25 Tert-Butanol 335.77-08 <5.0 200 200 213 209 ug/L EPA 8260B 6/11/03 107 104 2.26 70-130 25 Methyl-t-Butyl Ether 33577-08 <0.50 40.0 40.0 38.1 39.2 ug/L EPA 8260B 6/11/03 95.4 98.0 2.72 70-130 25 Benzene 33570-02 <0.50 40.0 40.0 38.9 37.6 ug/L EPA 8260B 6/12/03 97.3 94.1 3.40 70-130 25 Toluene 33570-02 0.64 40.0 40.0 42.3 41.0 ug/L EPA 8260B 6/12/03 104 101 3.19 70-130 25 Tert-Butanol 33570-02 <5.0 200 200 209 200 ug/L EPA 8260B 6/12/03 104 99.8 4.43 70-130 25 Methyl-t-Butyl Ether 33570-02 11 40.0 40.0 59.9 56.9 ug/L EPA 82606 6/12/03 122 115 6.43 70-130 25 Approved By: IJ ��aOVI' KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800 C