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1455 McDowell Blvd,North Ste D <br /> a_ )i Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> wwwsequoiafabs.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 %REC Limits RPD Limit Notes <br /> Batch 3090504-EPA 5030 waters <br /> Laboratory Control Sample Dup(3090504-BSD1) Prepared&Analyzed:09/22/03 <br /> Tert-amyl methyl ether 4.40 1.0 ug/1 5.00 88 70-116 4 20 <br /> Benzene 4.64 0.50 5.00 93 81-118 3 20 <br /> Tert-butyl alcohol 100 20 100 100 62-142 7 20 <br /> Di-isopropyl ether 4.36 1.0 5.00 87 71-121 3 20 <br /> 1,2-Dibromoethane(EDB) 4.84 0.50 5.00 97 92-117 2 20 <br /> 1,2-Dichloroethane 4.34 0.50 5.00 87 79-126 2 20 <br /> Ethanol 174 100 100 174 65-135 16 20 Q-29 <br /> Ethylbeezene 5.14 0.50 5.00 103 89-122 3 20 <br /> Ethyl tert-butyl ether 4.31 1.0 5.00 86 71-110 4 20 <br /> Methyl tert-butyl ether 4.17 0.50 5.00 83 77-123 5 20 <br /> Toluene 4.81 0.50 5.00 96 84-119 4 20 <br /> Alliftylenes 15.2 0.50 t5.0 101 86-132 3 20 <br /> -urrogate:Dibromo.Jluoromethane 4.21 " 4.50 94 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 3.88 4.50 86 74-135 <br /> Surrogate:Toluene-d8 4.54 4.50 101 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.56 " 4.50 101 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 wetght basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 32 of 38 <br />