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Sequoia <br /> Oa 1455 McDowell Blvd,North Ste D <br /> til Petaluma,CA 94954 <br /> (D Analytical ; FAX(707)792-0342 <br /> www.scquoialabs.com <br /> I ` <br /> URS Corp-Sacramento Project: Arco Site 6100;Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR366I9 .Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 # <br /> Volatile Organic Compounds by EPA Method 8260B i <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units - Dilution Batch Prepared Analyzed Method Notes <br /> 4 MW-2(P306337-01)Water Sampled:06/17/03 06:44 Received: 06/17/03 15:00 <br /> f <br /> Tert-amyl methyl ether ND 1.0 ug/l l 3060728 06/28/03 06/28/03 EPA 82608 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.4 <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 t <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 96% 84-122- <br /> Surrogate: <br /> 4-122-Surrogate: 1,2-Dichloroethane-d4 84% 74-135 <br /> Surrogate: Toluene-d8 96% 84-119 I <br /> 4 MW-6(P306337-02)Water Sampled:06/17/03 07:20 Received:06/17/03 15:00 R-45 <br /> Tert-amyl methyl ether ND 200 ug/l 200 3060728 06/28/03 06/28/03 EPA 8260B <br /> Tert-butyl alcohol ND 4000 <br />` Di-isopropyl ether ND 200 <br /> thanol ND 24000 <br /> Qthyl tert-butyl ether ND 200 <br /> Methyl tert-butyl ether 110 100 " <br /> Surrogate:Dibromofluoromethane 89% 84-122. " <br /> Surrogate: l,2-Dichloroethane-d4 82.% 74-135 j <br /> I Surrogate: Toluene-d8 92% 84-119 l <br /> a <br /> VW-5(P306337-03)Water Sampled:06/17/03 06:22 Received:06/17/03 15:00 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3060728 , 06/28/03 06/28/03 EPA 8260E 4 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.4 i <br /> Ethanol ND 104 " <br /> Ethyl tert-butyl ether ND 1.4 <br /> Methyl tert-butyl ether ND 0.50 <br /> Surrogate:Dibromofluoromethane 99% 84-121 " <br /> Surrogate: 1,2-Dichloroethane-d4 92% 74-135 <br /> Surrogate: Toluene-d8 104% 84-119 " <br /> I <br /> t <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. l <br /> I This analytical report must be reproduced in its entirety. <br /> Page 5 of 10 <br /> I, a <br />