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j <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Anaiyticai (707)792-1865 <br /> FAX(707)792-0342 <br /> www.seguoialabs.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 4060379-EPA 5030B waters <br /> Blank 4060379-BLKI Prepared&Analyzed:06/16/04 <br /> Tert-amyl methyl ether ND 1.0 ug/1 <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 /> urrogate:Dibromofluoromethane 5.57 5.00 111 84-122 <br /> Surrogate: l,2-Dichloroethane-d4 5.57 5.00 111 74-135 <br /> Surrogate: Toluene-d8 5.49 5.00 110 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.30 5.00 106 86-119 <br /> Laboratory Control Sample(4060379-BS1) Prepared&Analyzed:06/16/04 <br /> Tert-amyl methyl ether 5.18 1.0 ug/l 5.00 104 <br /> 78-117 <br /> Benzene 5.35 0.50 5.00 107 81-118 <br /> Tert-butyl alcohol 103 20 100 103 60-147 <br /> Di-isopropyl ether 5.48 1.0 5.00 110 70-125 <br /> 1,2-Dibromoethane(EDB) 5.47 0.50 5.00 109 85-125 <br /> 1,2-Dichloroethane 5.36 0.50 5.00 107 77-126 <br /> Ethanol 142 100 100 142 55-200 <br /> Ethylbenzene 5.48 0.50 5.00 110 89-122 <br /> Ethyl tert-butyl ether 5.17 1.0 5.00 103 71-120 <br /> Methyl tert-butyl ether 5.10 0.50 5.00 102 70-122 <br /> Toluene 5.18 0.50 5.00 104 84-119 <br /> Xylenes(total) 16.9 0.50 15.0 113 86-132 <br /> Surrogate:Dibromofluoromethane 5.54 5.00 111 84-122 <br /> Surrogate: l,1-Dichloroethane-d4 5.32 5.00 106 74-135 <br /> Surrogate: Toluene-d8 5.66 5.00 113 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.32 5.00 106 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 /> Ii <br />!. Page 21 of 37 <br />'E <br /> w� _. <br />