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3 <br /> 885 Jarvis Dr <br /> Sequoia Morgan]fill,CA 95037 <br /> (408)771-9600 <br /> a-- Analytical FAX(408)782-6308 <br /> www.sequoialabs.con <br /> URS Corporation Project: ARCO#5450,Stockton,Ca MMC0716 <br /> 500 12th Street,Suite 100 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Oakland CA,94607 Project Manager: Vern Elarth 04/07/03 14:05 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C27006-EPA 5030B PIT <br /> Blank(3C27006-BLKI) Prepared&Analyzed:03/27/03 <br /> Ethanol ND 100 ugll <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> &soline Range Organics(C6-C10) ND 50 " <br /> Surrogate:1,2-Dichloroethane-d4 4.19 5.00 83.8 78-129 <br /> Laboratory Control Sample(3027006-BSI) _ Prepared&Analyzed:03/27/03 <br /> Methyl tent-butyl ether 9.68 0.50 ugA 10.0 96.8 63-137 <br /> Benzene 10.3 0.50 10.0 103 78-124 <br /> Toluene 8.51 0.50 10.0 85.1 78-129 <br /> Surrogate: 1,2-Dichloroelhane-d4 4.21 5.00 84.2 78-129 <br /> Laboratory Control Sample(3C27006-BS2) Prepared&Analyzed:03/27/03 _ <br /> Methyl tert-butyl ether 8.27 0.50 ugA 9.04 91.5 63-137 <br /> Benzene 5.52 0.50 5.44 101 78-124 <br /> Toluene 26.5 0.50 32.8 80.8 78-129 <br /> Gasoline Range Organics(C6-C10) 377 50 440 85.7 70-113 <br /> Surrogate:l,2-Dichloroethane-d4 4.22 5.00 84.4 78-119 <br /> equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 5 of 7 <br /> I <br />