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I <br /> _ SeqSequoia 885 Jarvis Drive <br /> uoia_ Morgan Hill,CA 95037 <br /> i 7 (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> a'� www.sequoialabs.com <br /> URS Corporation[Arco I] Project:ARCO#2130,Stockton,CA M0I0544 <br /> 2870 Gateway Oaks Dr.,Ste 300_ Project Number:GOBZK-0002 Reported: <br /> SacramentoiCA,95833 Project Manager:Vemon 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 Note <br /> VW-10(MOI0544-15)Water Sampled:09/11/05 09:00 Received:09/14/05 08:55 <br /> tert-Amyl methyl ether ND 12 ugA 25 5123007 09/23/05 09/23/05 EPA 8260B <br /> Benzene 300 12 <br /> tert-Butyl alcohol ND 500 " <br /> Di-isopropyl ether ND 12 " <br /> 1,2-Dichloroethane ND 12 " <br /> Ethanol I ND 2500 " <br /> Ethyl tert-butyl ether ND 12 " <br /> Ethylbenzene 470 12 " <br /> Methyl tert-butyl ether ND 12 " <br /> Toluene <br /> 1 260 12 " <br /> Xylenes(total) 520 12 " <br /> Gasoline Range Organics(C4-02) 4000 1200 " <br /> Surrogate:1,2-Dichloroethane-d4 82% 60-135 " " " <br /> —..VW-11 (MOI0544-16)Water Sampled:09/12/05 08:40 Received:09/14/05 08:55 <br /> kumotert-Amyl methyl ether ND 0.50 ugn 1 5123007 09/23/05 09/23/05 EPA 8260B <br /> Benzene 36 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane 0.64 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene 43 0.50 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) 24 0.50 " <br /> Gasoline Range Organics(474-C 12) 450 50 " <br /> Surrogate:1,2-Dichloroethane-d4 78% 60-135 " <br /> Sequoia Anal ]cal-Morgan Hill The results in this report apply to the sam tes analyzed in accordance with the chain o <br /> 9 Yt� g P PPY P Yz f <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br />€ Page 10 of 25 <br /> Y <br />_ I <br />