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4 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical {707)792-1365 <br /> FAX(707)192-0342 <br /> www,sequaialabs.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 °/.REC RPD <br /> Analyte Result Limit Units Level Result %PEC Limits RPD Limit Notes <br /> Batch 3090409-EPA 5030 waters <br /> Blank(3090409-BLK1) Prepared&Analyzed: 09/18/03 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibrornoethane(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 tent-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> A11111kylenes(total) ND 0.50 " <br /> arrogate:Dibromofluoromethane 5.22 5.00 104 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 3.51 5.00 110 74-135 <br /> Surrogate: Toluene-d8 4.68 5.00 94 84-119 <br /> Surrogate:4-Bromofluarobenzene 5.18 5.00 104 86-119 <br /> Laboratory Control Sample(3090409-BS1) Prepared&Analyzed: 09/18/03 <br /> Tert-amyl methyl ether 4.53 1.0 ug/1 5.00 91 70-116 <br /> Benzene 5.03 0.50 5.00 101 81-118 <br /> I <br /> Tert-butyl alcohol 117 20 100 117 62-142 <br /> Di-isopropyl ether 4.32 1.0 5.00 86 71-121 <br /> 1,2-Dibromoethane(EDB) 5.01 0.50 5.00 100 92-117 <br /> 1,2-Dichloroethane 5.18 0.50 5.00 104 79-126 <br /> Ethanol 130 100 100 130 65-135 <br /> Ethylbenzene 4.93 0.50 5.00 99 89-122 <br /> Ethyl tert-butyl ether 4.58 1.0 5.00 92 71-110 <br /> Methyl tert-butyl ether 4.58 0.50 5.00 92 77-123 <br /> Toluene 5.03 0.50 5.00 101 94-119 <br /> Xylenes(total) 15.1 0.50 15,0 101 86-132 <br /> Surrogate:Dibromofluoromethane 5.02 5.00 100 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 5.31 5.00 106 74-135 <br /> Surrogate: Toluene-d8 4.73 5.00 93 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.92 5.00 98 86-119 <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 26 of 38 <br />