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Blvd,North Ste D <br /> 4D Sequoia 1455 McDowell.Pe Petaluma,CA 949544 <br /> Analytical FAX(707(707) 9922-01342 <br /> . www sequoialabs coin <br /> URS Corp-Sacramento Protect Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G097Z-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 30 <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 /> I <br /> Batch 4040616-EPA 5030 soils <br /> Blank 4040616-BLK1Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether ND 0 0050 mg/kg <br /> Benzene ND 0 0050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 0 0050 <br /> 1,2-Dibromoethane(EDB) ND 0 0050 " <br /> 1,2-Dichloroethane ND 0 0050 " <br /> Ethanol ND 0 20 " <br /> Ethylbenzene ND 0 0050 " <br /> Ethyl tett-butyl ether ND 0 0050 " <br /> Methyl tent-butyl ether ND 0 0050 " <br /> Toluene ND 0 0050 " <br /> ,gftj�ylenes(total) ND 0 0050 " <br /> 'Wurrogate Dibromofluoromethane 00539 00500 108 81-126 <br /> Surrogate 12-Dichloroethane-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 0 0525 0 0050 mg/kg 0 0500 105 74-126 <br /> Benzene 0 0498 00050 00500 100 75-123 <br /> Tert-butyl alcohol 0 924 0 l0 1 00 92 66-129 <br /> Di-isopropyl ether 0 0491 00050 00500 98 71-127 <br /> 1,2-Dibromoethane(EDB) 0 0541 00050 00500 108 88-118 <br /> 1,2-Dichloroethane 0 0538 00050 00500 108 79-119 <br /> Ethanol 1 12 020 1 00 112 70-140 <br /> Ethylbenzene 0 0528 00050 00500 106 65-135 <br /> Ethyl tert-butyl ether 0 0512 00050 0 0500 102 72-123 <br /> Methyl Cert-butyl ether 0 0496 00050 00500 99 70-125 <br /> Toluene 0 0496 00050 00500 99 76-123 <br /> Surrogate Dibromofluoromethane 00538 00500 108 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00506 00 00500 101 73-1.31 <br /> Surrogate Toluene-d8 00545 00 00500 109 82-129 <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 10 of 12 <br />