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i <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX 92 1 00 <br /> Analytical wwwsequoialabs.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 Elatth 07/30/02 17:05 <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(5207171-01)Air Sampled:07/16/02 09:40 Received;_p7/I5107�)�:47 <br /> Purgeable Hydrocarbons 17 2.8 ppmv 1 2070208 07/17/02 07/17/02 DHS LUFT HC-12 <br /> Benzene ND 0.016 <br /> Toluene 0.046 0.013 " <br /> Ethylbenzene 0.051 0.012 <br /> Xylenes(total) 1.3 0.012 " <br /> Methyl tert-butyl ether ND 0.14 <br /> Surroeate:a,a,a-Trifluorotoluene 93% 60-140 " <br /> INF Cat Air(5207171-02)Air___Sampled:07/16/02 09:35 Received:07/16/02 15:47_ .. <br /> Purgeable Hydrocarbons 19 2.8 ppmv 1 2070208 07/17/02 07/17/02 DHS LUFT HC-12 <br /> Benzene ND 0.016 " <br /> Toluene 0.037 0.013 " <br /> Ethylbenzene 0.063 0.012 " <br /> Xylenes(total) 1.4 0.012 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> urroigate:a,a,a-Trifluorotoluene 89% 60-140 " <br /> EFF Air(S207171-03)Air Samnled:_07/16/02 09:20 Received:07/16/02 15:47 <br /> Purgeable Hydrocarbons ND 2.8 ppmv 1 2070208 07/17/02 07/17/02 '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 n <br /> " " <br /> Surrogate:a,a,a-Trifluorotoluene 88% 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 />