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Sequoia 8851 <br /> t j Morn HiQ,CA 9503377 <br /> Analytical (408)772.9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[11 Project: ARCO#548,Stockton,Ca MMA05I6 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 01/27/03 14:40 <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 3014437-EPA 5030B P <br /> Blank(3010437-BLK1) Prepared&Analyzed:01/24/03 <br /> Purgeable Hydrocarbons ND 10 mg/in'Air <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 „ <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 1.84 2.00 92 60-140 <br /> Laboratory Control Sample(30I0437-BSI) Prepared&Analyzed:01/24/03 <br /> Benzene 1.70 0.I0 mg/ml Air 2.00 85 70-130 <br /> Toluene 1.75 0.10 2.00 88 70-130 <br /> thylbenzene 1.71 0.10 2.00 86 70-130 <br /> ylenes(total) 4.91 0.10 6.00 <br /> 82 70-130 <br /> Methyl tert-butyl ether 1.86 0.50 " 2.00 <br /> 93 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 1.81 2.00 90 60-140 <br /> Laboratory Control Sample Dup(3010437-BSDI) _ Prepared&Analyzed 01/24/03 <br /> Benzene 1.72 0.10 mg/ml Air 2.00 86 70-130 1 25 <br /> Toluene 1.77 0.10 " 2.00 88 70-130 1 25 <br /> Ethylbenzene 1.71 0.10 2.00 86 70-130 0 25 <br /> Xylenes(total) 4.99 0.10 6.00 83 70-130 2 25 <br /> Methyl tert-butyl ether 1.84 0.50 2.00 92 70-130 1 25 <br /> Surrogate:a,a,a-Triuorololuene 1.81 2.00 90 60-140 <br /> �equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 5 of 7 <br />