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6) (40885 Jarvis Drive <br /> 8)776-96 <br /> Sequoia Morgan Hill,CA95037 <br /> 0 Analytical FAX(408)782-6308 <br /> www.sequoialabs.corr <br /> URS Corporation f 11 Project: ARCO#5450,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vem Elarth 09/25/02 15:23 <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 2I18018-EPA 5030B PIT <br /> LCS Du 2118018-BSD1 Prepared&Analyzed:09/18/02 <br /> Methyl tert-butyl ether 10.6 0.50 ugA 10.0 106 63-137 0.00 13 <br /> j Benzene 8.58 0.50 10.0 85.8 78-124 0.467 12 <br /> Toluene 9.71 0.50 10.0 97.1 78-129 1.53 10 <br /> Surrogate: 1,2-Dichloroethane-d4 5.21 5.00 104 78-129 <br /> LCS Du (2[18018-BSD2) Prepared&Analyzed!09/18/02 <br /> Methyl tent-butyl ether 10.3 0.50 ugrl 8.40 123 63-137 0.966 13 <br /> Benzene 5.01 0.50 5.28 94.9 78-124 1.81 12 <br /> Toluene 34.2 0.50 31.8 108 78-129 2.37 10 <br /> Gasoline Range Organics(C6-CIO) 430 50 440 97.7 70-113 6.73 9 <br /> Surrogate: 1,2-Dichloroethane-d4 5.19 5.00 104 78-129 <br /> I <br /> Sequoia Analytical-Morgan Hill 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 /> 5 of 6 <br />