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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> a_ _� Analytical (701)792-1865 <br /> !, FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 2I30,Stockton,CA P504010 j <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 04/13/05 09:46 <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 "/,RHC Limits RPD limit Notes <br /> Batch 5040050-EPA 5030B waters I EPA 8260B <br /> Matrix Spike(5040050-MSI) Source:P504039-04 Prepared&Analyzed:04/06/05 <br /> Tert-amyl methyl ether 4.52 1.0 ug/1 5.00 ND 90 78-117 <br /> Benzene 4.47 0.50 5,00 ND 89 8I-118 <br /> Tert-butyl alcohol 112 20 100 ND 112 60-147 <br /> Di-isopropyl ether 4.52 1.0 5.00 ND 90 70-125 <br /> 1,2-Dichloroethane 4.58 0.50 5.00 ND 92 71-126 <br /> Ethanol 89.7 100 100 ND 90 55-200 <br /> Ethylbenzene 4.88 0.50 5.00 ND 98 89-I22 <br /> Ethyl tert-butyl ether 4.37 1.0 5.00 ND 87 71-I20 <br /> Methyl tent-butyl ether 4.61 0.50 5.00 ND 92 70-122 <br /> Toluene 4.82 0.50 5.00 ND 96 84-119 <br /> Xylenes(total) 14.3 0.50 15.0 ND 95 86-132 <br /> Surrogate:Dibromofluoromethane 4.97 5.04 99 84-122 <br /> Surrogate:1,1-Dichloroethane-d4 4.71 5.00 94 74-135 <br /> Surrogate:Toluene-d8 4.80 5.00 96 84-119 <br /> Surrogate:4-Beomofluorobenzene 5.08 5.00 101 86-119 <br /> Matrix Spike;Dup(5040050=MSD1) Source:P504039-04 Prepared&Analyzed:04/06/05 <br /> Tert-amyl methyl ether 4.74 1.0 ugA 5.00 ND 95 78.117 5 20 <br /> Benzene 4.64 0.50 5.00 AID 93 81-118 4 20 <br /> Tert-butyl alcohol 112 20 100 AFD 112 60-147 0 20 <br /> Di-isopropyl ether 4.83 1.0 5.00 ND 97 70-125 7 20 <br /> 1,2-Dichloroethane 4.87 0.50 5.00 ND 97 77-126 6 20 <br /> Ethanol 98.7 100 100 ND 99 55-200 10 20 <br /> Ethylbenzene 4.90 0.50 5.00 ND 98 89-122 0.4 20 <br /> Ethyl tert-butyl ether 4.59 1.0 5.00 ND 92 71-120 5 20 <br /> Methyl tert-butyl ether 4.92 0.50 5.00 ND 98 70-122 7 20 <br /> Toluene 4.98 0.50 5.00 ND 100 84-119 3 20 <br /> Xylenes(total) 14.8 0.50 15.0 ND 99 86-132 3 20 <br /> Surrogate:Dibromofluoromethane 5.10 5.00 101 84-122 <br /> Surrogate:1,2-bichloroethane-d4 5.08 5.00 102 74-135 <br /> Surrogate:Totten-d8 5.01 5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.11 5.00 104 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 24 of 29 <br />