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QC Report : Matrix Spike/Matrix Spike Duplicate Date : 612 Report Number 38650 Number : 5/2004 Project Name : Beacon Project Number: 3641 Stockton Duplicate Duplicate Spiked P 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 38782-05 <0.50 40.0 40.0 39.9 39.0 ug/L EPA 8260B 6121104 99.7 97.4 2.37 70-130 25 Toluene 38782-05 <0.50 40.0 40.0 41.3 39.7 ug/L EPA 8260B 6121/04 103 99.3 4.04 70-130 25 Tert-Butanol 38782-05 <5.0 200 200 197 208 ug/L EPA 82606 6121104 98.7 104 5.19 70-130 25 Methyl-t-Butyl Ether 38782-05 <0.50 40.0 40.0 42.0 40.4 ug/L EPA 8260B 6121104 105 101 3.84 70-130 25 Benzene 38860-06 <0.50 40.0 40.0 38.8 37.9 ug/L EPA 8260B 6/23/04 97.1 94.8 2.41 70-130 25 Toluene 38860-06 <0.50 40.0 40.0 39.7 38.9 ug/L EPA 8260B 6123104 99.2 97.3 1.95 70-130 25 Tert-Butanol 38860-06 <5.0 200 200 205 206 ug/L EPA 8260B 6123104 102 103 0.547 70-130 25 Methyl-t-Butyl Ether 38860-06 <0.50 40.0 40.0 40.9 40.7 ug/L EPA 8260B 6123104 102 102 0.642 70-130 25 Benzene 38898-12 20 40.0 40.0 57.4 55.1 ug/L EPA 82606 6/25104 92.3 86.4 6.63 70-130 25 Toluene 38898-12 2.1 40.0 40.0 42.4 40.7 ug/L EPA 82608 6125104 101 96.4 4.38 70-130 25 Tert-Butanol 38898-12 97 200 200 327 335 ug/L EPA 82606 6125/04 115 119 3.34 70-130 25 Methyl-t-Butyl Ether 38898-12 32 40.0 40.0 68.4 68.6 ug/L EPA 8260E 6125104 90.2 90.6 0.504 70-130 25 KIFF ANALYTICAL, LLC Approved By: Joe iff 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800