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4D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1W Analytical <br /> 7)792-1865 <br /> FAX(707)792-0342 <br /> wwwseyvoralabs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P411562 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project ManagerjeffBrooks 12/15/04 18:45 <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 RPU Limit Notes <br /> Batch 4120094-EPA 5030B waters 1 EPA 8260B <br /> Blank(4120094-BLKI) Prepared&Analyzed: 12/04/04 <br /> Tert-amyi methyl ether ND 1.0 ugll <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 tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> AdfthXylen (total) ND 0.50 " <br /> arrogate:Dibromofluoromethane 5.76 5.00 115 84-111 <br /> Surrogate:1,1-Dichloroethane-d4 5.90 5.00 118 74-135 <br /> Surrogate.,Toluene-d8 5.78 5.00 116 84-119 <br /> Surrogate:4-BromofTuorobenzene 5.66 5.00 113 86-119 <br /> Laboratory Control Sample(4120094-BSI) Prepared&Analyzed: 12/04/04 <br /> Tert-amyl methyl ether 6.30 1.0 ug/l 5.00 126 78-117 HL <br /> Benzene 5.43 0.50 5.00 109 81-118 <br /> Tert-butyl alcohol 86.4 20 100 86 60-147 <br /> Di-isopropyl ether 6,00 1.0 5.00 120 70-125 <br /> 1,2-Dibromoethane(EDB) 5.34 0.50 5.00 107 85-125 <br /> 1,2-Dichloroethane 5.31 0.50 5.00 106 77-126 <br /> Ethanol 282 100 100 282 55-200 HL <br /> Ethylbenzene 5.35 0.50 5.00 107 89-122 <br /> Ethyl tent-butyl ether 6.41 1.0 " 5.00 128 71-120 HL <br /> Methyl tert-butyl ether 5.73 0.50 " 5.00 115 70-122 <br /> Toluene 5.44 0.50 5.00 109 84-119 <br /> Xylenes(total) 16.3 0.50 15.0 109 86-132 <br /> Surrogate:Dibromofluoromethane 5.82 5.00 116 84-111 <br /> Surrogate:1,2-Dichloroethane-d4 5.71 5.00 114 74-135 <br /> Surrogate:Toluene-d8 5.79 5.00 116 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.68 5.00 114 86-119 <br /> Sequoia 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 7 of 9 <br />