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4D;�Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical c7o7,792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabS.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Note j <br /> MS-2B(P504010-21)Water Sampled:03/29/05 08:50 Received:03/30/05 11:50 <br /> Tert-amyl methyl ether ND 1.0 ugll 1 5040080 04/08/05 04/08/05 EPA 8260B <br /> Benzene ND 0.50 " " " " <br /> Tert-butyl alcohol ND 20 " " " " <br /> Di-isopropyl ether ND 1.0 " " " " <br /> 1,2-Dichloroethane ND 0.50 " " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromethane 105% 84-111 <br /> Surrogate:1,2-Dichloroethane-d4.. 109% 74-135 " " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> surrogate:4-Bromofluorobenzene 105% 86-119 " <br /> MS-3A(P504010-22)Water, Sampled:03/29/05 09:15 Received:0313010511:50 <br /> Tert-amyl methyl ether ND 5.0 ug/l 5 5040080 04/08/05 04/08/05 EPA 8260B <br /> Benzene 27 2.5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5.0 " <br /> 1,2-Dichloroethane ND 2.5 <br /> Ethanol ND 500 <br /> Ethylbenzene 2.5 2.5 " <br /> Ethyl tert-butyl ether ND 5.0 <br /> Methyl tert-butyl ether IS 2,5 ^ <br /> Toluene ND 2.5 <br /> Xylenes(total) 3.6 2.5 " <br /> Surrogate:Dibromofluoromethane 108% 84-122 " <br /> Surrogate:1,2-Dichloroe1hane-d4 114% 74-135 <br /> Surrogate: Toluene-d8 98% 84-119 ^ <br /> Surrogate:4-Bromofluorobenzene 111% 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 /> C) This analytical report must be reproduced in its entirety. <br /> Page 17 of 29 <br /> E <br />