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1455 McDowell Blvd,North 549 <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1665 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404354 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/28/04 16 54 <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 4040616-EPA 5030 soils <br /> Blank(4040616-BLK1) Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 f0 " <br /> Di-isopropyl ether ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> ylenes(total) ND 00050 " <br /> rrogate Dibromofluoromethane 00539 00500 108 81-126 <br /> Surrogate 1 2-Dichloroelhane-d4 00522 00500 104 73-131 <br /> Surrogate Toluene-d8 00539 00500 108 82-129 <br /> Laboratory Control Sample(4040616-BSI) Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether 00525 00050 mg/kg 00500 105 74-126 <br /> Benzene 00498 00050 00500 100 75-123 <br /> Tert-butyl alcohol 0 924 0 10 1 00 92 66-129 <br /> Di-isopropyl ether 00491 00050 00500 98 71-127 <br /> 1,2-Dibromoethane(EDB) 00541 00050 00500 108 88-118 <br /> 1,2-Dichloroelhane 00538 0 0050 00500 108 79-119 <br /> Ethanol 1 12 0 20 100 112 70-140 <br /> Ethylbenzene 00528 00050 00500 106 65-135 <br /> Ethyl tert-butyl ether 00512 00050 00500 102 72-123 <br /> Methyl tert-butyl ether 00496 00050 00500 99 70-125 <br /> Toluene 00496 00050 00500 99 76-123 <br /> Surrogate Drbromofluoromethane 00538 00500 108 81-126 <br /> Surrogate 12-Drchloroethane-d4 00506 00500 101 73-131 <br /> Surrogate Toluene-d8 00545 00500 109 82-129 <br /> Sequoia <br /> quota 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 11 of 13 <br />