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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.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 P-ject Manager. Vernon Elarth 09/04/02 16:30 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air(ppmv) by DHS LUFT-Quality Control <br /> Sequoia Analytical-Sacramento . <br /> Reporting Spike Source °/REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080296-EPA 5030B(P/T) <br /> Blank(2080296-BLK1) Prepared&Analyzed:08/29/02 <br /> Purgeable Hydrocarbons ND 2.8 ppmv <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. OA 4 <br /> Surrogate:a,a,a-Tris luorotoluene 0.282 0,335 84 60-140 <br /> LCS(2080296-BSI) Prepared&Analyzed:08/29/02 <br /> Surrogate:a,a,a-Tris luorotoluene 0.315 ppmv 0.335 94 60-140 <br /> LCS Du 2080296-BSDI Prepared&Analyzed:08/29/02 <br /> Surrogate:a,a,a-Tri luorotoluene 0.298 ppmv 0.335 89 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 5 of 6 <br />