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Sequoia 1455 McDowell Blvd North Ste D <br /> (D— Petaluma CA 94954 <br /> (707)792-1865 <br /> WoAnalytical <br /> FAX 792 0342 <br /> www sequoiequoialabs corn <br /> URS Corn-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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050050-EPA 5030B soils McOH <br /> Laboratory Control Sample Dup(4050050-BSD1) Prepared&Analyzed 05104/04_ <br /> Tert-amyl methyl ether 2 18 1 0 mg/kg 200 109 74-126 09 �35 <br /> Benzene 224 1 0 200 112 75-123 0 35 <br /> Tert-butyl alcohol 466 20 40 0 116 66-129 7 35 <br /> Di isopropyl ether 2 30 1 0 2 00 115 71-127 0 35 <br /> l 2-Dibromoethane(EDB) 2 19 1 0 2 00 110 88-118 0 5 35 <br /> l 2-Dichloroethane 2 34 1 0 2 00 117 79-119 1 35 <br /> Ethanol 43 8 40 400 110 70-140 10 35 <br /> Ethylbenzcnc 2 20 1 0 2 00 110 65-135 0 5 35 <br /> Ethyl tort-butyl ether 2 35 l 0 2 00 118 72-123 0 4 35 <br /> Methyl tert butyl ether 2 24 1 0 2 00 112 70-125 0 4 35 <br /> Toluene 2 21 l 0 2 00 110 76-123 0 9 35 <br /> Surrogate DibromoJluoromethane 2 15 „ 2 00 108 81-126 <br /> Surrogate 1 2-Drchloroethane d4 229 2 00 114 73-131 <br /> Surrogate Toluene-d8 2 17 2 00 108 82-129 <br /> Batch 4050057-EPA 5030(pres 48h) <br /> Blank(4050057-BLK1) Prepared&Analyzed 05/04/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 <br /> Tert-butyl alcohol ND 0 10 <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 tort-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluorom ethane 00484 00500 97 81-126 <br /> Surrogate 12-Drchloroethane-d4 00484 00.500 97 73-131 <br /> Surrogate Toluene-d8 00502 00500 100 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 ih entirety <br /> Page 14 of 18 <br />