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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 45834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> r-sac-,Gateway Oaks Project: ARCO 548,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 Project Number: 548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager. Vernon Elarth 09/04/02 16:30 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air by DHS LUFT <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(5208367-01)Air Sam2led:08/27/02 08:15 Recelved:08/27/02 14:35 <br /> Purgeable Hydrocarbons 110 10 mg/m'Air 1 2080296 08/29/02 08/29/02 DHS LUFT <br /> Benzene ND 0.050 " <br /> Toluene 0.35 0.050 " <br /> Ethylbenzene 0.33 0.050 " <br /> Xylenes(total) 6.4 0.050 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 86% 60-140 " <br /> INF Cat Air(5208367-02)Air Sampled:08/27/02 08:15 Received:08/27/02 14:35 <br /> Purgeable Hydrocarbons 150 100 mg/ml Air 10 2080296 08/29/02 08/29/02 DHS LUF r HC-12 <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene 0.65 0.54 " <br /> Xylenes(total) 5.3 0.54 " <br /> Anik�Methvl tert-butyl ether ND 5.4 " <br /> Surrot;afe:a,a,a-Trifluorotoluene 92% 60-140 " <br /> EFF Air(5208367-03)Air Sampled:08/27/0208:10 Received:08/27/02 14:35 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air l 2080296 08/29/02 08/29/02 DHS LUFT <br /> Benzene ND 0.050 1. " " <br /> Toluene ND 0.050 Ip I. <br /> Ethylbenzene ND 0.050 " <br /> Xylenes(total) ND 0.050 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Surroeate:a,a,a-Trifluorotoluene 85% 60-140 " <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 2 of 6 <br />