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819 Striker Avenue,Suite 9 <br /> Z6Sequoia Sacramento,CA 95834 <br /> , (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> S-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 07/09/02 16:44 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air 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 2060347-EPA 5030B(PIT) <br /> Blank(2060347-BLKI) Prepared&Analyzed:06/25/02 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 0.050 " <br /> Toluene ND 0.050 <br /> Ethylbenzene ND 0.050 " <br /> Xylenes(total) ND 0.050 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 2.12 1.00 106 60-140 <br /> LCS(2060347-BSI) Prepared&Analyzed: 06/25/02 <br /> Benzene 2.02 0.050 mg/ml Air 2.00 101 70-130 <br /> Toluene 2.18 0.050 2.00 109 70-130 <br /> Ethylbenzene .2.18 0.050 2.00 109 70-130 <br /> lenes(total) 6.33 0.050 6.00 106 70-130 <br /> ethyl tert-butyl ether 2.41 0.50 2.00 120 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 2.17 2.00 108 60-140 <br /> LCS Dup(2060347-BSDI) Prepared&Analyzed: 06/25/02 _ <br /> Benzene 1.83 0.050 mg/ml Air 2.00 92 70-130 10 25 <br /> Toluene 1.97 0.050 2.00 98 70-130 10 25 <br /> Ethylbenzene 2,01 0.050 2.00 100 70-130 8 25 <br /> Xylenes(total) 5.87 0.050 6.00 98 70-130 8 25 <br /> Methyl tert-butyl ether 2.17 0.50 2.00 108 70-130 10 25 <br /> Surrogate:a,a,a-Trifluoro toluene 2.01 2.00 100 60-140 <br /> equoia 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 4 of 6 <br />