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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 <br /> `1 (916)921-96009600 <br /> Analytical FAX(916)921.0100 <br /> www.sequoialabs.com <br /> lta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager. .lay Johnson 04/12/02 16:58 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air by DHS LIFT- 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 2040085-EPA 5030B(P/T) <br /> Blank(2040085-BLKI) Prepared&Analyzed:04/03/02 <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 2.09 2,00 104 60-140 <br /> LCS(2040085-BS1) Prepared&Analyzed:04/03/02 <br /> Benzene 1.62 0.050 mg/m'Air 2.00 81.0 70-130 <br /> Toluene 1.85 0.050 2.00 92.5 70-130 <br /> Ethylbenzene 2.04 0.050 2.00 102 70-130 <br /> Genes(total) 5.98 0.050 6.00 99.7 70-130 <br /> hyl tert-butyl ether 2.01 0.50 2.00 100 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 2.15 2.00 108 60-140 <br /> LCS Dup(2040085-BSDI) Prepared&Analyzed: 04/03/02 <br /> Benzene 1.68 0.050 mg/ml Air 2.00 84.0 70-130 3.64 25 <br /> Toluene 1.86 0.050 2.00 93.0 70-130 0.539 25 <br /> Ethylbenzene 2.08 0.050 2.00 104 70-130 1.94 25 <br /> Xylenes(total) 6.04 0.050 6.00 101 70-130 0,998 25 <br /> Methyl tert-butyl ether 2.39 0.50 2.00 120 70-130 17.3 25 <br /> Surrogate:a,a,a-Trifluoro toluene 2.14 2.00 107 60-140 <br /> uoia 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 />