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(D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> r .Analytical <br /> 7)792-1865 <br /> FAX(707)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 Numbers 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 /> Blank(3090504-BLKI) Prepared&Analyzed:09/22/03 <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 too " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1,0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Alliftylenes(total) ND 0.50 " <br /> --nurrogate:Dibromolluoromelhane 4.31 4.50 96 84-111 <br /> Surrogate: 1,2-Dichloroethane-d4 4.00 4.50 89 74-135 <br /> Surrogate: Toluene-d8 4.55 4.50 101 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.50 4.50 100 86-119 <br /> Laboratory Control Sample(3090504-BSI) Prepared&Analyzed:09/22/03 <br /> Tert-amyl methyl ether 4.24 1.0 ug/l 5.00 85 70-116 <br /> Benzene 4.50 0.50 5.00 90 81-118 <br /> Tert-butyl alcohol 107 20 100 107 62-142 <br /> Di-isopropyl ether 4.23 1.0 5.00 85 71-121 <br /> 1,2-Dibromoethane(EBB) 4.74 0.50 5.00 95 92-117 <br /> 1,2-Dichloroethane 4.25 0.50 5.00 85 79-126 <br /> Ethanol 205 100 100 205 65-135 Q-29 <br /> Ethylbenzene 4.98 0.50 5.00 100 89-122 <br /> Ethyl cert-butyl ether 4.14 1.0 5.00 83 71-110 <br /> Methyl tert-butyl ether 3.96 0.50 5.00 79 77-123 <br /> Toluene 4.61 0.50 5.00 92 a4-119 <br /> Xylenes(total) 14.8 0.50 15.0 99 86-132 <br /> Surrogate:Dibromofluoromethane 4.23 4.50 94 84-122 <br /> Surrogate: l,1-Dichloroethane-d4 3.80 4.50 84 74-135 <br /> Surrogate:Toluene-d8 4.54 4.50 101 84-119 <br /> Surrogate:4-Bromofluorohenzene 4.51 4.50 100 86-119 <br /> eguoia 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 31 of 38 <br />