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1455 McDowell Blvd North Ste D <br /> 4DSequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.scquoialabs.com <br /> 10 <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Dtive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 0311210416:07 <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 4030184-EPA 5030B waters <br /> Blank(4030184-BLKI) Prepared&Analyzed:03/09/04 <br /> Tert-amyl methyl ether ND I.0 ug/l <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 /> Xylenes(total) ND 0.50 " <br /> urrogate:Dibromofluoromethane 4.96 5.00 99 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4,82 5.00 96 74-135 <br /> Surrogate:Toluene-d8 5.47 5.00 109 84-119 <br /> Surrogate.4-Bromofluorobenzene 4.63 5.00 93 86-119 <br /> Laboratory Control Sample(4030184-BS1) Prepared&Analyzed:03/09/04 <br /> Tert-amyl methyl ether 4.95 1.0 ug/I 5.00 99 78-117 <br /> Benzene 4.83 0.50 5.00 97 81-118 <br /> Tert-butyl alcohol 95.4 20 100 95 60-147 <br /> Di-isopropyl ether 4,82 1.0 5.00 96 70-125 <br /> 1,2-Dibromoethane(EDB) 4.66 0.50 5.00 93 85-125 <br /> 1,2-Dichloroetbane 5.01 0.50 5.00 100 77-126 <br /> Ethanol 95.4 100 100 95 55-200 <br /> Ethylbenzene 5.08 0.50 5.00 102 89-122 <br /> Ethyl tent-butyl ether 5.00 1.0 5.00 100 71-120 <br /> Methyl tert-butyl ether 4.92 0.50 5.00 98 70-122 <br /> Toluene 5.76 0.50 5.00 115 84-119 <br /> Xylenes(total) 15.2 0.50 15.0 101 86-132 <br /> Surrogate:Dibromofluoromethane 5.00 5.00 100 84-122 <br /> Surrogate:1,2-Dichloroethane-0 4.71 5.00 94 74-135 <br /> Surrogate:Toluene-d8 5.40 5.00 108 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.75 5.00 95 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 9 of 11 <br />