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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ra- ) (707)Analytical FAX 792-0865 <br /> (707)792-0342 <br /> i <br /> www.sequoialabs.com <br /> • <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P503065 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95933 Project Manager:Jeff Brooks 03/14/05 18:14 <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 5030114-EPA 5030B waters it EPA 8260B <br /> Blank(5030114-BLKI) Prepared&Analyzed:03/10/05 <br /> Tert-amyl methyl ether ND 1.0 ug1l <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> ylenes(total) ND 0.50 " <br /> rrogate:Dibromoflteoromethane 5.13 5.00 105 84-112 <br /> Surrogate:1,1-Dichloroethane-d4 5.39 5.00 108 74-135 <br /> Surrogate:Toluene-d8 5.42 5.00 108 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.50 5.00 110 86-119 <br /> Laboratory Control Sample(5030114-BSI) Prepared&Analyzed:03/10/05 <br /> Tert-amyl methyl ether 5.31 1.0 ug/l 5.00 106 78-117 <br /> I <br /> Benzene 5.09 0.50 5.00 102 81-118 <br /> Tert-butyl alcohol 91.9 20 100 92 60-147 <br /> Di-isopropyl ether 5.48 1.0 5.00 110 70-125 <br /> 1,2-Dibromoethane(EDB) 5.10 0.50 5.00 102 85-125 <br /> 1,2-Dichloroethane 5.05 0.50 5.00 101 77-126 <br /> Ethanol 104 100 100 104 55-200 <br /> Ethylbenzene 4.94 0.50 5.00 99 89-122 <br /> Ethyl Cert-butyl ether 5.31 1.0 5.00 106 71-120 <br /> Methyl Cert-butyl ether 5.37 0.50 5.00 107 70-122 <br /> Toluene 5.03 0.50 5.00 101 84-119 <br /> Xylenes(total) 15.3 0.50 15.0 102 86-132 <br /> Surrogate:Dibromofluoromethane 5.46 5.00 109 84-112 <br /> Surrogate:1,1-Dichloroethane-d4 5.40 5.00 108 74-135 <br /> Surrogate:Toluene-d8 5.54 5.00 Ill 84-119 <br /> Surrogate:4-Bromo)7uorobenzene 5.43 5.00 109 86-119 <br /> Sequoia 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 7 of 9 <br /> I <br />