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`1 <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> AnalY <br /> tical FAX(707)792-0342 <br /> wwwsequoialabs.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 °/6REC Limits RPD Limit Notes <br /> Batch 3090409- EPA 5030 waters <br /> Laboratory Control Sample Dup(3090409-BSD1) Prepared&Analyzed: 09/18/03 <br /> Tert-amyl methyl ether 4.62 1.0 no 5.00 92 70-116 2 20 <br /> Benzene 4.95 0.50 5.00 99 81-118 2 20 <br /> Tert-butyl alcohol 116 20 100 116 62-142 0.9 20 <br /> Di-isopropyl ether 5.08 1.0 5.00 102 71-121 16 20 <br /> 1,2-Dibromoethane(EDB) 5.24 0.50 5.00 105 92-117 4 20 <br /> 1,2-Dichloroethane 5.22 0.50 5.00 104 79-126 0,8 20 <br /> Ethanol 123 100 100 123 65-135 6 20 <br /> Ethylbenzene 4.90 0.50 5.00 98 89-122 0.6 20 <br /> Ethyl tert-butyl ether 4.86 1.0 5.00 97 71-110 6 20 <br /> Methyl tert-butyl ether 4.56 0.50 5.00 91 77-123 0.4 20 <br /> Toluene 4,87 0.50 5.00 97 84-119 3 20 <br /> liftylenes(total) 15.0 0.50 15.0 100 86-132 0.7 20 <br /> urrogate:DibromoJluoromethane 5.17 5.00 105 84-122 <br /> Surrogate:1,2-Dichloroelhane-d4 5.62 5.00 111 74-135 <br /> Surrogate:Toluene-d8 4.94 5.00 99 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.37 5.00 107 86-119 <br /> Batch 3090442-EPA 5030 waters <br /> Blank(3090442-BLK1) Prepared&Analyzed:09/19/03 <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-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 1.0 " <br /> Methyl cert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromelhane 5.00 5.00 IOU 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.97 5.00 99 74-135 <br /> Surrogate:Toluene-d8 4.58 5.00 92 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.05 5.04 101 86-119 <br /> equoia Analytical-Petaluma The results rn 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 27 of 38 <br />