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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> `i (916)921-9600 <br /> Analytical FAX(916)921=0100 <br /> www.sequoinlabs.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 Forgeable 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 Emits Level Result %REC Limits RPD Limit Notes <br /> Batch 2070208-EPA 5030B(P/T) <br /> Blank(2070208-BLKI) _ Prepared&Analyzed:07/17/02 <br /> Purgeable Hydrocarbons ND 10 mg/m'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 1.98 2.00 99 60-140 <br /> LCS(2070208-BSI) Prepared&Analyzed:07/17/02 <br /> Benzene 2.02 0.050 mg/ml Air 2.00 101 70-130 <br /> Toluene 2.06 0.050 2.00 103 70-130 <br /> Ethylbenzene 2.11 0.050 2.00 106 70-130 <br /> Xylenes(total) 6.06 0.050 6.00 101 70-130 <br /> 0-M.thyl tert-butyl ether 2.00 0.50 2.00 100 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 2.07 2.00 104 60-140 <br /> LCS Dup(2070208-BSDI) Prepared&Analyzed:07/17/02 <br /> Benzene 1.91 0.050 mg/ml Air 2.00 96 70-130 6 25 <br /> Toluene 2.05 0.050 2.00 102 70-130 0.5 25 <br /> Ethylbenzene 2.10 0.050 2.00 105 70-130 0.5 25 <br /> Xylenes(total) 6.18 0.050 6.00 103 70-130 2 25 <br /> Methyl tert-butyl ether 2.33 0.50 2.00 116 70-130 15 25 <br /> Surrogate:a,a,a-Trifluorotoluene 1.90 1.00 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 4 of 6 <br />