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E Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> J aww.sequo'salabs.com <br /> 1 , <br /> URS Corporation[Arco I] Project:ARCO#2130,Stockton,CA M0I0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method No <br /> F <br /> MS-3B(MOI0544-23)Water Sampled:0911110514:20 Received:09/14/05 08:55 BD <br /> tert-Amyl methyl ether ND 0.50 ug/l 1 5I26007 09/26/05 09/26/05 EPA 8260B <br /> Benzene 51 0.50 <br /> cert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dichloroeihane ND 0.50 <br /> Ethanol ND 100 IC <br /> Ethyl Cert-butyl ether ND 0.50 <br /> Ethylbenzene' 22 0.50 " <br /> Methyl tert-butyl ether 38 0.50 <br /> Toluene 37 0.50 <br /> Ei <br /> Xylenes(total) 59 0.50 <br /> Gasoline Range Organics(C4-C12) 410 50 <br /> Surrogate:,1,2-Dichloroethane-d4. 96% 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise staled,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 3 <br /> Page 14 of 25 <br /> �y , <br />