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1455 McDowell Blvd,North Ste D <br /> 2 Sequoia Petaluma.CA 94954 <br /> (707)792-1865 <br /> �� Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intron-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 06/14/04 20 24 <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 4FO7003-EPA 5030B PIT <br /> Matrix Spike(4F07003-MSI) Source MNE0696-01 Prepared 06/07/04 Analyzed 06/08/04 <br /> Methyl tart-butyl ether 3820 50 ug/l 992 2700 113 63-137 <br /> Surrogate 1,2-Dichloroethane-d4 384 500 117 78-129 <br /> Matrix Spike Dup(41707003-MSDI) Source MNE0696-01 Prepared 06/07/04 Analyzed 06/08/04 <br /> Methyl tert-butyl ether 3970 50 U911 992 2700 128 63-137 385 20 <br /> Surrogate 12-Dichloroethane-d4 594 500 119 78-129 <br /> Sequoia Analytical-Petaluma 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 /> Page 17 of 20 <br />