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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> -jI!!Z*' A (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 Project Manager: Vernon Elarth 09/04/02 16:30 <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 2080296-EPA 5030B PIT <br /> Blank 2080296-BLKI _ Prepared&Analyzed:08/29/02 <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-TriJluorotoluene 1.69 2.00 84 60-140 <br /> LCS(2080296-BSI) _ Prepared&Analyzed:08/29/02 <br /> Benzene 1.88 0.050 mg/ml Air 2.00 94 70-130 <br /> Toluene 1.91 0.050 2.00 96 70-130 <br /> Ethylbenzene 1.96 0.050 2.00 98 70-130 <br /> Xylenes(total) 6.10 0.050 6.00 102 70-130 <br /> ethyl tert-butyl ether 1.71 0.50 2.00 86 70-130 <br /> Surrogate:a,a,a-Triuorotoluene 1.88 2.00 94 60-140 <br /> LCS Du 2080296-BSD/ Prepared&Analyzed:08/29/02 <br /> Benzene 1.81 0.050 mg/m'Air 2.00 90 70-130 4 25 <br /> Toluene 1.89 0.050 2.00 94 70-130 1 25 <br /> Ethylbenzene 1.92 0.050 2.00 96 70-130 2 25 <br /> Xylenes(total) 6.07 0.050 6.00 101 70-130 0.5 25 <br /> Methyl tert-butyl ether 1.87 0.50 2.00 94 70-130 9 25 <br /> Surrogate:a,a,a-Trifluorotoluene 1.78 2.00 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 4 of 6 <br />