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} <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> d www.sequoialabs.com <br /> • <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 03/12/04 16:07 <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 °/6REC Limits RPD Limit Notes <br /> Batch 4030145-EPA 5030B waters <br /> Blank(4030145-BLK1) Prepared&Analyzed:03/05/04 <br /> Tert-amyl methyl ether ND 1.0 ugll <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND I.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 I.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> arrogate:Dibromofluoromethone 5.16 5.00 103 84-122 <br /> Surrogate:l,1-Dichloroethane-d4 5.32 5.00 106 74-135 <br /> Surrogate:Toluene-d8 5.01 5.00 100 84-119 <br /> Surrogate.,4-Bromofluorobenzene 6.17 5.00 123 86-119 zSLIM <br /> Laboratory Control Sample(4030145-BSI) Prepared&Analyzed:03/05/04 <br /> Tert-amyl methyl ether 4.90 1.0 ugll 5.00 98 78-117 <br /> Benzene 5.23 0.50 5.00 105 81-118 <br /> Tert-butyl alcohol 123 20 100 123 60-147 <br /> Di-isopropyl ether 4.97 1.0 5.00 99 70-125 <br /> 1,2-Dibromoethane(EDB) 5.09 0.50 5.00 102 85-125 <br /> 1,2-Dichloroethane 4.79 0.50 5.00 96 77-126 <br /> Ethanol 132 100 100 132 55-200 <br /> Ethylbenzene 4.71 0.50 5.00 94 89-122 <br /> Ethyl ten-butyl ether 5.02 1.0 5.00 100 71-120 <br /> Methyl tert-butyl ether 4.85 0.50 5.00 97 70-122 <br /> Toluene 4.85 0.50 5.00 97 84-119 <br /> Xylenes(total) 14.7 0.50 15.0 98 86-132 <br /> Surrogate:Dibromofluoromethane 4.97 5.00 99 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.72 5.00 94 74-135 <br /> Surrogate:Toluene-d8 4.59 " 5.00 92 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.74 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 wei weight basis. <br /> . <br /> This analytical report must be reproduced in its entirety. <br /> Page 7 of 11 <br />