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814 scram Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921.0100 <br /> www.scquoialabs.com <br /> URS-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(ppmv)by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> IINE oto it(S208367-01)Air Sam led:08/27/02 08:15 Received:08/27/02 14:35 <br /> Purgeable Hydrocarbons 28 2.8 ppmv 1 2080296 08/29/02 08/29/02 DHS LUFT <br /> Benzene ND 0.016 ^ <br /> Toluene 0.094 0.013 " <br /> Ethylbenzene 0.076 0.012 " <br /> Xylenes(total) 1.5 0.012 " n ^ <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trilfuorotoluene 86% 60-140 " <br /> INF Cat Air S208367-02 Air Sampled:08/27/02 08:15 Received:08/27/02 14:35 <br /> Purgeable hydrocarbons 37 28 ppmv 10 2080296 08/29/02 08/29/02 DHS LUFT HC-12 <br /> Benzene. ND 0.16 <br /> Toluene ND 0.13 " <br /> Ethylbenzene 0.15 0.12 ^ <br /> Xylenes(total) 1.2 0.12 " <br /> Methyl ter[-butyl ether ND 1.4 " <br /> urrotrate:a,a,a-Tri/luorotoluene 92916 60-140 " <br /> EFF (S208367-03) it Sampled:08/27108:10 Received:08/27/02 14:35 <br /> Purgeable Hydrocarbons ND 2.8 ppmv 1 2080296 08/29/02 08/29/02 DHS LUFT <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-TriJluorotoluene 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 3 of 6 <br />