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819 Striker Avenue,Suite 8 <br /> Sequoia� Sacramento,)9 95834 <br /> : (916)921-96009600 <br /> Analytical FAX(916)921-0]00 <br /> Ask 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 Project Manager. Vernon Elarth 07/30/02 17:05 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air(ppmv)by DHS LUFI'-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 2070208-EPA 5030B(PnD <br /> Blank 2070208-BLKl) Prepared&Analyzed:07/17/02 <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 0.14 " <br /> Surrogate:a,a,a-Trifluorotoluene 0.331 0.335 99 60-140 <br /> LCS(2070208-BS1) Prepared&Analyzed:07/17/02 <br /> Surrogate:a,a,a-Trifluorololuene 0.346 ppmv 0.335 103 60-140 <br /> LCS Dup(2070208-BSD1) Prepared&Analyzed:07/17/02 <br /> Surrogate:a,a,a-Trifluorololuene 0.318 ppmv 0.335 95 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 />