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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> -aw, Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <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 4060456-EPA 5030B waters <br /> Blank 4060456-BLKI Prepared&Analyzed:06/21/04 <br /> Tert-amyl methyl ether ND 1.0 uW1 <br /> Benzene ND 0.50 " <br /> Text-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 IND 0.10 " <br /> Toluene ND 0.50 " <br /> ylenes(total) ND 0.50 " <br /> rrogate:Dibromojluoromethane 5.83 5.00 117 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5,72 5.00 114 74-135 <br /> Surrogate:Toluene-d8 5.70 5.00 114 84-119 <br /> Surrogate:4-BromoJluorobenzene 5.53 5.00 111 86-119 <br /> Laboratory Control Sample(4060456-BSI) Prepared_ &Analyzed_:06/21/04 <br /> Tert-amyl methyl ether 5.58 1.0 UFA 5.00 112 78-117 <br /> Benzene 5.64 0.50 5.00 113 81-118 <br /> Tert-butyl alcohol 97.1 20 100 97 60-147 <br /> Di-isopropyl ether 5.78 1.0 5.00 116 70-125 <br /> 1,2-Dibromoethane(EDB) 5.84 0.50 5.00 117 85-125 <br /> 1,2-Diehl oroethane 5.66 0.50 5.00 113 77.126 <br /> Ethanol 96.4 100 100 96 55-200 <br /> Ethylbenzene 5.60 0.50 5.00 ill 89.122 <br /> Ethyl tert-butyl ether 5.58 1.0 5.00 112 71.120 <br /> Methyl tert-butyl ether 5.57 0.50 5.00 111 70-122 <br /> Toluene 5.40 0.50 5.00 108 84-119 <br /> Xylenes(total) 17.5 0.50 15.0 117 86-132 <br /> Surrogate:DibromoJluoromethane 5.78 5.00 116 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.65 5.00 113 74-135 <br /> Surrogate: Toluene-d8 5.87 5.00 117 84-119 <br /> Surrogate:4-BromoJluorobenzene 5.44 5.00 109 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> I <br /> t Page 27 of 37 <br />