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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a- ) (707) <br /> Analytical FAX 792-1865 <br /> TqW (701)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REG RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090481 -EPA 5034 waters <br /> Laboratory Control Sample(3090481-BS1) Prepared&Analyzed: 09/22/03 <br /> Tert-amyl methyl ether 4.46 1.0 ug/I 5.00 89 70-116 <br /> Benzene 4.85 0.50 5.00 97 81-118 <br /> Tert-butyl alcohol 108 20 100 108 62-142 <br /> Di-isopropyl ether 4.69 1.0 5.00 94 71-121 <br /> 1,2-Dibromoethane(EDB) 4.60 0.50 5.00 92 92-117 <br /> 1,2-Dichloroethane 4.63 0.50 5.00 93 79-126 <br /> Ethanol 199 100 100 199 65-135 Q-29 <br /> Ethylbettzene 4.84 0.50 5.00 97 89-122 <br /> Ethyl tert-butyl ether 4.52 1.0 5.00 90 71-110 <br /> Methyl tert-butyl ether 4.76 0.50 5.00 95 77-123 <br /> Toluene 4.82 0.50 5.00 96 84-119 <br /> AlMylenes(total) 14.5 0.50 15.0 97 86-132 <br /> arrogate:Dibromofluoromethane 5.95 6.00 99 84-112 <br /> Surrogate:l,1-Dichloroethane-d4 5.53 6.00 92 74-135 <br /> Surrogate: Toluene-d8 6.08 6.00 101 84-119 <br /> Surrogate:4-Bromofluorobenzene 6,01 6.00 100 86-119 <br /> Laboratory Control Sample Dup(3090481-BSD1) Prepared&Analyzed: 09/22/03 <br /> Tert-amyl methyl ether 4.66 1.0 ugli 5.00 93 70416 16 4 20 <br /> Benzene 5.01 0.50 5.00 100 81-118 3 20 <br /> Tert-butyl alcohol 127 20 100 127 62.142 16 20 <br /> Di-isopropyl ether 4.83 1.0 5.00 97 71-121 3 20 <br /> 1,2-Dibromoethane(EDB) 4.96 0.50 5.00 99 92-117 8 20 <br /> 1,2-Dichloroethane 4,54 0.50 5.00 91 79-126 2 20 <br /> Ethanol 138 100 100 138 65-135 36 20 Q-29 <br /> Ethylbenzene 5.05 0.50 5.00 101 89-122 4 20 <br /> Ethyl tent-butyl ether 4.76 1.0 5.00 95 71-110 5 20 <br /> Methyl tert-butyl ether 4.86 0.50 5.00 97 77-123 2 20 <br /> Toluene 4.95 0.50 5.00 99 84-119 3 20 <br /> Xylenes(total) 15.0 0,50 15.0 100 86-132 3 20 <br /> Surrogate:Dibrornofluoromethane 5.78 6.00 96 84-122 <br /> Surrogate:l,1-Dichloroethane-d4 5.42 6.00 90 74-135 <br /> Surrogate:Toluene-d8 6.03 6.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.89 600 98 86-119 <br /> i <br /> �equoia 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 30 of 38 <br />