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Sequoia 1455 McDowellPetaluma CA 9495D4 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs cam <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analytt, Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4050050-EPA 5030B soils McOH <br /> Blank(4050050-BLKI) Prepared&Analyzed 05/04/04 <br /> Tert-amyl methyl ether ND 1 0 mg/kg <br /> Benzene ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> I 2-Dibromoethane(EDB) ND 1 0 " <br /> 1,2-Dichloroethane ND 1 0 " <br /> Ethanol ND 40 " <br /> Ethylbenzene ND l 0 <br /> Ethyl tert butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND l 0 " <br /> Toluene ND 1 0 " <br /> Xylenes(total) ND 1 0 <br /> Surrogate Dibromofluoromethane 2 06 " 200 103 81-126 <br /> Surrogate 12-Dichloroethane-d4 2 25 2 00 112 73-131 <br /> Surrogate Toluene d8 2 08 200 104 82-129 <br /> Laboratory Control Sam le(4050050-BS1) Prepared&Analyzed 05/04/04 <br /> Tert-amyl methyl ether 2 20 1 0 mg/kg 2 00 110 74-126 <br /> Benzene 224 l 0 " 2 00 112 75-123 <br /> Tert-butyl alcohol 43 5 20 400 109 66-129 <br /> Di-isopropyl ether 2 30 1 0 2 00 115 71-127 <br /> 1 2-Dibromoethane(EDB) 2 20 l 0 2 00 l 10 88-118 <br /> 1,2-Dichloroethane 2 37 l 0 2 00 118 79-119 <br /> Ethanol 39 7 40 40 0 99 70-140 <br /> Ethylbenzene 2 19 l 0 2 00 110 65-135 <br /> Ethyl tert-butyl ether 2 34 l 0 2 00 117 72-123 <br /> Methyl tert-butyl ether 2 25 l 0 2 00 112 70-125 <br /> Toluene 2 19 1 0 200 110 76-123 <br /> Surrogate Dibromofluoromethane 2 21 2 00 110 81-126 <br /> Surrogate 12-Dichloroethane-d4 2.38 2 00 119 73-131 <br /> Surrogate Toluene-d8 2 18 2 00 109 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 13 of 18 <br />