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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0 100 <br /> www.sequoialabs.com <br /> Eta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: 548,Stockton,CA Reported; <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 04/12/02 16:58 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air(ppmv) by DHS LUFT <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air 5204014-01 Air Satn led:04/01/02 06:23 Received:04/01/02 10:10 <br /> Purgeable Hydrocarbons 69 28 ppmv 10 2040085 04/03/02 04/03/02 DHS LU-FT <br /> Benzene ND 0.16 " <br /> Toluene 0.32 0.13 " <br /> Ethylbenzene 0.12 0.12 <br /> Xylenes(total) 1.6 0.12 <br /> Methyl tert-butyl ether ND 1.4 <br /> Surrogate:a,a,a-Trifluorotoluene 101 % 60-140 <br /> INF CAT Air 5204014-02 Air Sara led:04/01/02 06:20 Received: 04/01/02 10:10 <br /> Purgeable Hydrocarbons 85 28 ppmv 10 2040085 04/03/02 04/03/02 DHS LUFT <br /> Benzene ND 0.16 " <br /> Toluene ND 0.13 " <br /> Ethylbenzene ND 0.12 <br /> Xylenes(total) 1.0 0.12 " <br /> Adlkthvl tert-butyf ether ND 1.4 <br /> rrogate:a.a,a-Trifluorotoluene 103% 60-140 <br /> EFF Air($204014-03)AirSampled:04/01/02 06:17 Received:04/01/02 10:10 <br /> Purgeable Hydrocarbons ND 2.8 ppmv 1 2040085 04/03/02 04/03/02 DHS Ll_1FT <br /> Benzene ND 0.016 <br /> Toluene ND 0.013 " <br /> Ethylbenzene ND 0.012 <br /> Xylenes(total) ND 0.012 <br /> Methyl tert-butyl ether ND 0.14 <br /> Surrogate;a.a,a-Trifluorotoluene 75.2% 60-140 " <br /> 11 <br /> uoia 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 3 of 6 <br />