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i <br /> D- <br /> Sequoia E455 McDowell Blvd,North Ste D <br /> �'�� i Petaluma,CA 94954 <br /> '� Analytical FAX(707)792-1865 <br /> (707)792-0342 <br /> www.sequoialabs.com <br /> • <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P311175 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 11/21/03 16:39 <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 3110391-EPA 5030 waters <br /> Laboratory Control Sample Du (3110391-BSD1) Prepared&Analyzed: 11/18/03 <br /> Teri-amyl methyl ether 4.89 LO ug/l 5.00 98 70-116 3 20 <br /> Benzene 5.41 0.50 " 5.00 108 81-118 0.2 20 <br /> Tert-butyl alcohol 96.6 20 " 100 97 62-142 29 20 QR-02 <br /> Di-isopropyl ether 6.01 1.0 " 5.00 120 71-121 2 20 <br /> 1,2-Dibromoethane(EDB) 5.95 0.50 5,00 119 92-117 4 20 Q-29 <br /> 1,2-Dichloroethane 5.47 0.50 " 5.00 109 79-126 3 20 <br /> Ethanol 102 100 100 102 65-135 23 20 QR-02 <br /> Ethylbenzene 5.09 0.50 5.00 102 89-122 1 20 <br /> Ethyl Cert-butyl ether 5.18 LO 5.00 104 71-1I0 0.8 20 <br /> Methyl tert-butyl ether 4.85 0.50 5.00 97 77-123 3 20 <br /> Toluene 5.77 0.50 5.00 115 84-119 1 20 <br /> Xylenes(total) 15.7 0.50 15.0 105 86-132 0.6 20 <br /> arrogate:Dibromofluoromelhane 5.34 5.00 107 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 4.92 5.00 98 74-135 <br /> Surrogate: Toluene-d8 4.79 5.00 96 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.73 5.00 95 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 9 of 10 <br />