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I <br /> 885 lams Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical <br /> (408)776-9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs con <br /> URS Corporation f Il Project ARCO 9434 MMD0150 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number Intnm-50433 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 04/16/03 08 19 <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 3D11005-EPA 5030B PIT <br /> Matrix Spike(3D11005-MSI) Source MMD0120-11 Prepared&Analyzed 04/11/03 <br /> Methyl tent-butyl ether 1280 10 ugA 181 1200 442 63-137 QM-07 <br /> Benzene 116 10 109 ND 106 78-124 <br /> Toluene 615 10 656 ND 93 8 78-129 <br /> Gasoline Range Organics(C6-C10) 7450 1000 8800 1600 665 70-113 QM-07 <br /> Surrogate 12-Dichlaroethane-d4 468 500 <br /> 936 78-129 <br /> Matrix Spike Du 3D11005-MSDI Source MMD0120-11 Prepared&Analyzed 04/11/03 <br /> Methyl tert-butyl ether 1270 10 ug/l 181 1200 38 7 63-137 0 784 13 QM-07 <br /> Benzene 110 10 109 ND 101 78-124 531 12 <br /> Toluene 599 10 656 ND 91 3 78-129 264 10 <br /> Gasoline Range Organics(C6-C10) 7130 1000 8800 1600 62 8 70-113 439 9 QM-07 <br /> I <br /> Surrogate 12-Drchloroethane-d4 4 77 500 954 78-129 <br /> Sequoia 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 /> 7 of 8 <br />