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f4 p <br /> Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> (408)776-9640 <br /> AnalyticalFAX(408)782-6308 <br /> www.scquoialabs.com <br /> URS Corporation[Arco]] Project:ARCO 112130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento.t:CA,95833 Project Manager:Vcrnon P.Elarth 09/29/05 14:23 <br /> .. <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 Not <br /> i <br /> MW-7(MOI0544-07)Water Sampled:09/1110510:55 Received:09/14/05 08:55 <br /> tert-Amyl methyl ether ND 0.50 ug/I 1 5I22001 09/22/05 09/22/05 EPA 8260B <br /> Benzene ND 0.50 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol y ND 100 <br /> Ethyl tert-butyl ether ND 0.50 ^ <br /> Ethylbenzene's ND 0.50 ^ <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics.(C4-C12) ND 50 ^ " <br /> Surrogate:1,2-Dichloroethane-d4 82% 60-135 " <br /> 1r—,VW-1(M010544-08)Water Sampled:09/12105 09:30 Received:09/14/05 08:55 <br /> 1 <br /> %wo4cTt-Amyl methyl ether ND 10 ug/l 20 5122001 09/22/05 09/22/05 EPA 8260B <br /> Benzene ND IO " <br /> tert-Butyl alcohol ND 400 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Ethanol ND 2000 " <br /> Ethyl tert-butyl ether ND 10 ^ " <br /> Ethylbenzene 220 10 " <br /> Methyl tert-butyl ether ND 10 " <br /> Toluene ND 10 <br /> Xylenes(total) 790 10 <br /> Gasoline Range Organics(C4-Cl2) 24000 1000 <br /> Surrogate:1,d-Dichloroelhane-d4 80% 60-135 <br /> Sequoia Anal ical-Morgan q yt ga Hill 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 /> This analytical report must be reproduced in its enlirety: <br /> i <br /> Page 6 of 25 <br /> f <br /> x <br /> t <br />