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4D (701455 McDowell Blvd,North Ste D <br /> Sequoia PeWuma,CA 94954 <br /> 1W Analytical <br /> 7)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> • <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P411562 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number.WR36604 Reporter/: <br /> Sacramento CA,95833 Project Manager:)e1PBrooks 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 "/uREC Limits RPD limit Notes <br /> Batch 4120094-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4120094-MS1) Source:P411502-12 Prepared&Analyzed: 12/04/04 <br /> Tert-amyl methyl ether 7.16 1.0 ugll 5.00 ND 143 78-117 LM <br /> Benzene 5.74 0.50 5.00 ND ]is 81-118 <br /> Ten-butyl alcohol 85.9 20 100 ND 86 60-147 <br /> Di-isopropyl ether 6.29 1.0 5.00 ND 126 70-125 LM <br /> 1,2-Dibromoethane(EDB) 5.49 0.50 5.00 ND 110 85-125 <br /> 1,2-Dichloroethane 5.60 0.50 5.00 ND 112 77-126 <br /> Ethanol 198 100 100 ND 198 55-200 <br /> Ethylbenzene 5.66 0.50 5.00 ND 113 89-122 <br /> Ethyl tert-butyl ether 6.98 1.0 5.00 ND 140 71-120 LM <br /> Methyl tert-butyl ether 5.99 0.50 5.00 ND 120 70-122 <br /> Toluene 5.77 0.50 " 5.00 ND 115 84-119 <br /> ga�Xylenes(total) 17.2 0.50 15.0 ND 115 86-132 <br /> urrogate:Dibromofluoromethane 5.90 5.00 118 84-112 <br /> Surrogate:l,2-Dichloroethane-d4 5.83 5.00 117 74-13S <br /> Surrogate:Toluene-d8 5.80 5.00 116 84-119 <br /> Surrogate:4-BromoJluorobenzene 5.56 " 5,00 111 86-119 <br /> Matrix Spike Dup(4120094-MSD1) Source:P411502-12 Prepared&Analyzed: 12/04/04 <br /> Tert-amyl methyl ether 7.10 LO UPI 5.00 ND 142 78-117 0.8 20 LM <br /> Benzene 5.61 0.50 5.00 ND 112 81-118 2 20 <br /> Tert-butyl alcohol 87.3 20 100 ND 87 60-147 2 20 <br /> Di-isopropyl ether 6.24 1.0 5.00 ND 125 70-125 0.8 20 <br /> 1,2-Dibromoethane(EDB) 5.49 0.50 5.00 ND 110 85-125 0 20 <br /> 1,2-Dichloroethane 5.51 0.50 5.00 ND 110 77-126 2 20 <br /> Ethanol 218 100 100 ND 218 55-200 10 20 LM <br /> Ethylbenzene 5.60 0.50 5.00 ND 112 89-122 1 20 <br /> Ethyl ten-butyl ether 6.83 1.0 5.00 ND 137 71-120 2 20 LM <br /> Methyl ten-butyl ether 5.99 0.50 5.00 ND 120 70-122 0 20 <br /> Toluene 5.64 0.50 5.00 ND 113 84-119 2 20 <br /> Xylenes(total) 16.8 0.50 15.0 ND 112 86-132 2 20 <br /> Surrogate:Dibromofluoromethane 5.91 5.00 118 84-112 <br /> Surrogate:l,2-Dichloroethane-d4 5.74 5.00 115 74-135 <br /> Surrogate:Toluene-d8 5.83 5.00 117 84-119 <br /> Surrogate:4-BromoJluorobenzene 5.52 5.00 110 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 8 of 9 <br /> I <br />