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Sequoia 1455 McDowell Blvd,North Ste D <br /> lz) Petaluma,CA 94954 <br /> Analytical (7117)792-1865 <br /> • FAX(707)792-0342 <br /> I wwtivsequoialabs.com <br /> I <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P405282 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number;WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 06/02/04 14:08 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reportiq Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result "/REC Limits RPD Limit Notes <br /> Batch 4050590-EPA 5030B waters <br /> Matrix Spike(4050590-MS1) Source:P405263-02 Prepared&Analyzed:05/24/04 <br /> Ted-amyl methyl ether 5.41 1.0 ugA 5.00 ND 108 78-117 <br /> Benzene 5.15 0.50 5.00 ND 103 81-118 <br /> Tert-butyl alcohol 111 20 t00 ND ill 60-147 <br /> Di-isopropyl ether 5.33 1.0 5.00 ND 107 70-125 <br /> 1,2-Dibromoethane(EDB) 5.90 0.50 5.00 ND 118 85-125 <br /> 1,2-Dichloroethane 6.57 0.50 5.00 0.27 126 77-126 <br /> Ethanol 110 100 100 ND 110 55-200 <br /> Ethylbenzene 5.86 0.50 5.00 0.41 109 89-122 <br /> Ethyl tert-butyl ether 5.55 1.0 5.00 ND 111 71-120 <br /> Methyl tert-butyl ether 5.45 0.50 5.00 ND 109 70-122 <br /> Toluene 5.48 0.50 5.00 0.14 107 84-119 <br /> lenes total <br /> I ( ) 18.6 0.50 15.0 1.5 114 86-132 <br /> trrogate:Dibromofluoromethane 4.81 S.00 96 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.29 5.00 106 74-135 <br /> Surrogate:Toluene-d8 4,55 5.00 91 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.61 5.00 92 86-119 <br /> Matrix Spike Du (4050590-MSD 1) Source: P405263-02 Prepared:05/24/04 Analyzed:05/25/04 j <br /> Tert-amyl methyl ether 5.95 1.0 u9/1 5.00 ND 119 78-117 10 20 QC01 <br /> Benzene 5,33 0.50 5.00 ND 107 81-118 3 20 <br /> Tert-butyl alcohol 114 20 100 ND 114 60-147 3 20 <br /> Di-isopropyl ether 5.53 Lo 5.00 ND 1 I 1 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 6.13 0.50 " 5.00 ND 123 85-125 4 20 <br /> 1,2-Dichloroethane 6,91 0,50 5.00 0.27 133 77-126 5 20 QC01 <br /> Ethanol 92.3 100 100 ND 92 55-200 17 20 <br /> Ethylbenzene 5.69 0.50 5.00 0.41 106 89-122 3 20 <br /> Ethyl Cert-butyl ether 5.89 1.0 5.00 ND 118 71-120 6 20 <br /> Methyl tert-butyl ether 6.02 0.50 5.00 ND 120 70-122 t0 20 <br /> Toluene 5.62 0.50 5.00 0.14 110 84-119 3 20 <br /> Xylenes(total) 18.3 0.50 15.0 1.5 112 86-132 2 20 <br /> Surrogate:Dibromofluoromethane 5.03 5.00 101 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.52 5.00 110 74-135 <br /> Surrogate:Toluene-d8 4.59 5.00 92 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.68 5.00 94 86-119 <br /> j <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> 0 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 />