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i <br /> t 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> '1 Y FAX(707)792-0342 <br /> www.sequoialabs.com <br /> 6) <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:Vemon 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 ?Vote <br /> k <br /> VW-12(P504010-17)Water, Sampled:0312810514:20 Received:03/3010511:50 <br /> Tert-amyl methyl ether ND 10 ug/l 10 5040080 04/08/05 04/08/05 EPA 82608 <br /> Benzene 23 5.0 <br /> Tert-butyl alcohol ND 200 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichloroethane 270 5.0 <br /> Ethanal ND 1000 <br /> Ethylbenzen6 6.5 5.0 <br /> Ethyl tert-butyl ether ND 14 <br /> Methyl tert-butyl ether ND 5.0 " <br /> Toluene ND 5.0 <br /> Xylenes(total) ND 5.0 <br /> Surrogate'Dibromofluoromethane 101 % 84-112 " <br /> Surrogate:1,2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate:Toluene-d8 99% 84-119 <br /> Surrogate:4-13romofluorobenaene 103% 86-119 11 " <br /> MS-1A(P504010-18)Water Sampled:03/29/05 08:35 Received:03/3010511:50 <br /> Tert-amyl methyl ether ND 1.0 ug/l 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 0.79 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 108% 84-121 " <br /> Surrogate:1,1-Dichloroethane-d4, 111 % 74-135 " <br /> Surrogate:Toluene-d8 104% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 108% 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 /> i If <br /> This analytical report must be reproduced in its entirety. <br /> Page 15 of 29 <br />