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Report Number: 55413 QC Report : Matrix Spike/ Matrix Spike Duplicate Date : 03/26/2007 Project Name : Tracy High School Project Number: DLT02.041 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 TPH as Diesel Blank <50 1000 1000 988 1080 ug/L M EPA 8015 3/17/07 98.8 108 8.62 70-130 25 TPH as Diesel 55371-10 2.8 20.0 20.0 22.6 19.1 mg/Kg M EPA 8015 3/21/07 98.8 83.6 16.7 60-140 25 Benzene 55343-10 <0.0050 0.0398 0.0394 0.0383 0.0366 mg/Kg EPA 8260B 3/15/07 96.3 92.9 3.66 70-130 25 Toluene 55343-10 <0.0050 0.0398 0.0394 0.0369 0.0356 mg/Kg EPA 8260B 3/15/07 92.8 90.4 2.60 70-130 25 Tert-Butanol 55343-10 <0.0050 0.199 0.197 0.179 0.172 mg/Kg EPA 8260B 3/15/07 89.9 87.1 3.16 70-130 25 Methyl-t-Butyl Ether 55343-10 <0.0050 0.0398 0.0394 0.0409 0.0364 mg/Kg EPA 8260B 3/15/07 103 92.5 10.6 70-130 25 Benzene 55414-03 <0.0050 0.0399 0.0399 0.0421 0.0420 mg/Kg EPA 8260B 3/16/07 105 105 0.161 70-130 25 Toluene 55414-03 <0.0050 0.0399 0.0399 0.0422 0.0425 mg/Kg EPA 8260B 3/16/07 106 106 0.493 70-130 25 Tert-Butanol 55414-03 <0.0050 0.200 0.200 0.181 0.189 mg/Kg EPA 8260B 3/16/07 90.8 94.6 4.06 70-130 25 Methyl-t-Butyl Ether 55414-03 <0.0050 0.0399 0.0399 0.0433 0.0434 mg/Kg EPA 8260B 3/16/07 108 109 0.143 70-130 25 Benzene 55370-04 <0.50 39.9 40.0 42.8 43.6 ug/L EPA 8260B 3/17/07 107 109 1.52 70-130 25 Toluene 55370-04 <0.50 39.9 40.0 41.4 42.4 ug/L EPA 82606 3/17/07 104 106 2.42 70-130 25 Tert-Butanol 55370-04 <5.0 200 200 200 199 ug/L EPA 8260B 3/17/07 100 99.4 0.706 70-130 25 Methyl-t-Butyl Ether 55370-04 <0.50 39.9 40.0 45.6 45.9 ug/L EPA 82608 3/17/07 114 115 0.439 70-130 25 Approved By: Jo iff KIFF ANALYTICAL, LLC 2795 2nd Street, Suite 300 Davis, CA 95618 530-297-4800