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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> `1 (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> 1Ita Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 ProjectNumber. 548,Stockton,CA [reported: <br /> meron Park CA,95682 Project Manager Jay Johnson 04/12/02 16:58 <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(8204014-01)Air. Sampled:04/01/02 06:23 Received:04/01/02 10:10 _ <br /> Purgeable Hydrocarbons 280 100 Mg/M3 Air 10 2040085 04/03/02 04/03/02 DHS LUFT <br /> Benzene ND 0.50 <br /> Toluene 1.2 0.50 " <br /> Ethylbenzene 0.53 0.50 <br /> Xylenes(total) 7.1 6.50 " <br /> Methyl tert-butyl ether ND 5.0 " <br /> Surro.zate:a.a,a-Trifluorotoluene 102% 60-140 " <br /> INF CAT Air 0204014-02)Air _Sampled:04/01/02 06:20 Received: 04/01/02 10:10 <br /> Purgeable Hydrocarbons 350 100 mg/m'Air 10 2040085 04/03/02 04/03/02 DHS LUFT <br /> Benzene ND 0.50 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) 4.5 0.50 " <br /> thy/tent-butyl ether ND 5.0 <br /> urroizate:a,a,a-Trifluorotoluene 103% 60-140 " <br /> EFF Air(5204074-03)Air Sampled:04/01/02 06:17 Received:0410110210:10 <br /> Purgeable Hydrocarbons ND 10 mg/m'Air 1 2040085 04/03/02 04/03/02 DHS LUFT <br /> Benzene ND 0.050 " <br /> Toluene ND 0.056 " <br /> Ethylbenzene ND 0.056 " <br /> Xylenes(total) ND 0.050 <br /> Methyl tert-butyl ether ND 0.50 <br /> Surrogate:a.a,a-Trifluorotoluene 75.0% 60-140 <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 2 of 6 <br />