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r <br /> Sequoia 1455 McDowell Blvd, Ste D <br /> '�'"� Petaluma,,CA CA 44954 <br /> ► <br /> Analytical (707)792-1865 <br /> FAX(707)742-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Drive Suite 300 Protect 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 3070531-EPA 5030 soils <br /> Matrix Spike Du 3070531-MSDI Source P307295-01 Prepared&Analyzed 07/24/03 <br /> Benzene 0 0480 0 0050 mg/kg 0 0500 ND 96 75-123 11 35 <br /> Methyl tert-butyl ether 0 0512 00050 0 0500 ND 102 78-125 10 35 <br /> Toluene 00461 00050 0 0500 00025 87 76-123 12 35 <br /> Surrogate Dibromofluororneihane 00441 00450 98 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00422 00450 94 73-131 <br /> Surrogate Toluene-d8 00458 00450 101 82-129 <br /> Batch 3070564-EPA 5030 soils <br /> Blank(3070564-BLK1) Prepared&Analyzed 07/26/03 <br /> Tert-amyl methyl ether ND 0 0050 mg/kg <br /> Benzene ND 0 0050 " <br />�ert-butyl alcohol ND 010 " <br /> opropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 0 0050 " <br /> 1,2-Dichloroethane ND 00050 <br /> 1 Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 0 0050 " <br /> Xylenes(total) ND 0 0050 " <br /> Surrogate Dibromofluoromethane 00482 00450 107 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00470 00450 104 73-131 <br /> Surrogate Toluene-d8 00502 00450 112 82-129 <br /> Laboratory Cootrol Sample(3070564-BSI) Prepared&Analyzed 07/26/03 <br /> Benzene 00489 00050 mg/kg 00500 98 75-123 <br /> Methyl tert-butyl ether 00519 00050 00500 104 78-125 <br /> Toluene 0 0468 00050 00500 94 76-123 <br /> Surrogate Dibromofluoromethane 00494 " 004.50 110 81-126 <br /> Surrogate 12-Dichloroethane-d4 00482 00450 107 73-131 <br /> Surrogate Toluene-d8 00515 00450 114 82-129 <br /> r <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 /> r <br /> Page 12 of 14 <br /> r <br />