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4D4D8 i 9 Striker Avenue,Suite 8 Sacramento,Sacramento,CA 95834 Analytical (916)921-9609 FAX(916)921.0100 www.sequoialabs.com Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA 3330 Cameron Park Dr.Ste 550 Project Number: N/A Reported: Cameron Park CA,95682 Project Manager. Jay Johnson 09/21/01 15:50 Total Purgeable Hydrocarbons and BTEX by DHS LUFT-Quality Control Sequoia Analytical-Sacramento Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %PEC Limits RPU Limit Now Batch 1090137-EPA 5030B(MeOI) Blank 1090137-BLK1) Prepared&Analyzed:09/12/01 Purgeable Hydrocarbons ND 5.0 mg/kg Benzene ND 0.025 " Toluene ND 0.025 " Ethylbenzene ND 0.025 " Xylenes(total) ND 0.025 " Surrogate:a,a,a-Trijluorotoluene 1.08 1.00 108 60-140 LCS(1090137-BS1) Prepared&Analyzed:09/12/01 Benzene 1.03 0.025 mg/kg 1.00 103 70-130 Toluene 1.03 0.025 1.00 103 70-130 Ethylbenzene 0.991 0.025 1.00 99.1 70-130 Xylenes(total) 2.78 0.025 3.00 92.7 70-130 Surrogate:a,a,a-Trifluorotoluene 1.17 1.00 117 60-140 Matrix Spike(1090137-MSI) Source: S109122-01 Prepared&Analyzed:09/12/01 Benzene 0.895 0.025 mg/kg 1.00 ND 88.8 60-140 Toluene 0.925 0.025 1.00 ND 91.5 60-140 Ethylbenzene 0.898 0.025 1.00 ND 89.3 60-140 Xylenes(total) 2.53 0.025 3.00 ND 83.6 60-140 Surrogate:a,a,a-Trifluorotoluene 1.14 1.00 114 60-140 Matrix Spike Du (1090137-MSDI) Source: 5109122-41 Prepared&Analyzed:09/12/01 Benzene 0.880 0.025 mg/kg 1.00 ND 87.3 60-140 1.69 25 Toluene 0.915 0.025 1.00 ND 90.5 60-140 1.09 25 Ethylbenzene 0.891 0.025 1.00 ND 88.6 60-140 0.783 25 Xylenes(total) 2.49 0.025 3.00 ND 82.2 60-140 1.59 25 Surrogate:a,a,a-Tris luorotoluene 1.19 1.00 119 60-140 Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page Page 17 of 24