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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento <br /> Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070564-EPA 5030 soils <br /> Laboratory Control Sample Du 3070564-BSD1 Pre ared&Analyzed 07/26/03 <br /> Benzene 0 0463 0 0050 mg/kg 0 0500 93 75-123 5 35 <br /> 1 Methyl tert-butyl ether 0 0480 0 0050 0 0500 96 78-125 8 35 <br /> Toluene 00452 0 0050 00500 90 76-123 3 35 <br /> Surrogate Dibromofluoromethane 00480 00450 107 81-116 <br /> Surrogate 12-Dichloroethane-d4 00460 00450 102 73-131 <br /> Surrogate Toluene-d8 00496 00450 110 82-129 <br /> f <br /> Sequoia Analytical-Petaluma 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 /> Page 13 of 14 <br />