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Report Number : 40073 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 9/17/2004 Project Name : Beacon Project Number -. 3641 Stockton DuDuplicate Duplicate Spiked A 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 40027-11 <0.50 40.0 40.0 40.6 40.1 ug/L EPA 8260B 9113104 102 100 1.26 70-130 25 Toluene 40027-11 <0.50 40.0 40.0 41.0 42.1 ug/L EPA 8260B 9113104 103 105 2.44 70-130 25 Tert-Butanol 40027-11 <5.0 200 200 208 200 ug/L EPA 8260B 9113104 104 100 3.82 70-130 25 Methyl-t-Butyl Ether 40027-11 <0.50, 40.0 40.0 35.6 34.6 ug/L EPA 8260B 9113104 89.1 86.4 3.05 70-130 25 Benzene 40039-01 38 40.0 40.0 71.4 68.2 ug/L EPA 8260B 9114104 83.6 75.4 10.3 70-130 25 Toluene 40039-01 70 40.0 40.0 101 101 ug/L EPA 8260B 9114104 77.1 78.7 2.14 70-130 25 Tert-Butanol 40039-01 <5.0 200 200 200 204 ug/L EPA 82608 9114104 99.8 102 2.08 70-130 25 Methyl-t-Butyl Ether 40039-01 <0.50 40.0 40,0 36.3 35.8 ug/L EPA 8260B 9/14104 90,7 89.5 1.28 70-130 25 Benzene 40048-04 <0.50 40.0 40.0 40.9 39.2 ug/L EPA 8260E 9115104 102 98.0 4.28 70-130 25 Toluene 40048-04 <0.50 40.0 40.0 41.4 41.4 ug/L EPA 8260B 9115104 103 103 0.0199 70-130 25 Tert-Butanol 40048-04 <5.0 200 200 204 215 ug/L EPA 82608 9115104 102 108 5.38 70-130 25 Methyl-t-Butyl Ether 40048-04 <0.50 40.0 40.0 37.4 35.8 ug/L EPA 8260B 9115104 93.4 89.6 4.09 70-130 25 Benzene 40064-03 10 40.0 40.0 49.1 47.9 ug/L EPA 82608 9/14104 96.5 93.3 3.33 70-130 25 Toluene 40064-03 0.66 40.0 40.0 41.6 40.1 ug/L EPA 82608 9/14104 102 98.6 3.66 70-130 25 Tert-Butanol 40064-03 <5.0 200 200 210 201 ug/L EPA 82606 9114104 105 100 4.64 70-130 25 Methyl-t-Butyl Ether 40064-03 0.98 40.0 40.0 37.0 36.7 ug/L EPA 8260B 9114104 89.9 89.4 0.625 70-130 25 Benzene 40077-05 190 40.0 40.0 228 224 ug/L EPA 82608 9115104 88.2 78.5 11.7 70-130 25 Toluene 40077-05 220 40.0 40.0 257 252 ug/L EPA 8260B 9115/04 90.4 78.8 13.7 70-130 25 Joe iff I<IFF ANALYTICAL, LLC Approved By: 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800