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1455 McDowell Blvd North Ste D <br /> 6) <br /> Sequoia Petaluma,CA 94954 <br /> rr Analytical <br /> )792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P308382 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 09/03/03 15:55 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> lAnalyle Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080541-EPA 5030 waters <br /> Matrix Spike(3080541-MSI) Source:P308307-01 Prepared&Analyzed:08/27/03 <br /> Tert-amyl methyl ether 5.13 1.0 ugll 5.00 ND 103 70-116 <br /> Benzene 5.22 0.50 5.00 ND 104 81-118 <br /> Tert-butyl alcohol 94.7 20 100 ND 95 62-142 <br /> Di-isopropyl ether 5.36 1.0 5.00 ND 107 71-121 <br /> 1,2-Dibromoethane(EDB) 5.31 0.50 5.00 ND 106 92-117 <br /> 1,2-Dichloroethane 5.18 0.50 5.00 ND 104 79-126 <br /> Ethyl Cert-butyl ether 5.17 1.0 5.00 ND 103 71-110 <br /> Methyl tert-butyl ether 5.20 0.50 5.00 ND 104 77-123 <br /> Toluene 5.27 0.50 5.00 ND 105 84-119 <br /> Surrogate:Dibromofluoromethane 5.00 4.50 111 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.91 4.50 109 74-135 <br /> urrogate:Toluene-d8 4.95 4.50 110 84-119 <br /> rrogate:4-Bromofluorobenzene 4.82 4.50 107 86-119 <br /> Matrix Spike Dup(3080541-MSDI) Source:P308307-01 Prepared&Analyzed:08/27/03 <br /> Tert-amyl methyl ether 5.00 1.0 ugll 5.00 ND 100 70-116 3 20 <br /> Benzene 5.09 0.50 5.00 ND 102 81-118 3 20 <br /> Tert-butyl alcohol 107 20 100 ND 107 62-142 12 20 <br /> Di-isopropyl ether 5.31 1.0 5.00 ND 106 71-121 0.9 20 <br /> 1,2-Dibmmocthane(EDB) 5.17 0.50 5.00 ND 103 92-117 3 20 <br /> 1,2-Dichloroethane 5.04 0.50 5.00 ND 101 79-126 3 20 <br /> Ethyl tert-butyl ether 5.18 1.0 5.00 ND 104 71-110 0.2 20 <br /> Methyl tert-butyl ether 5.16 0.50 5.00 ND 103 77-123 0.8 20 <br /> Toluene 5.12 0.50 5.00 ND 102 84-119 3 20 <br /> Surrogate:Dibromofluoromethane 4.90 4.50 109 84-111 <br /> Surrogate: 1,2-Dichloroethane-d4 5.01 " 4.50 111 74-135 <br /> Surrogate: Toluene-d8 4.80 4.50 107 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.75 4.50 106 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document. 1lntess otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 8 of 9 <br />