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Blvd,North Ste D <br /> Sequoia 1455 McbawPe alu i CA 94954 <br /> W Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/11/05 10 44 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result limit Units Udution Batch Prepared Analyzed Method Note <br /> MW-5(P412405-05)Water Sampled 12/21/04 20 30 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND 10 ugll 1 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " ^ <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-12.2 " <br /> W <br /> rrogate 1 2-Dichloroethane-d4 117% 74-135rrogate Toluene-d8 106% 84-119 <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> MW-6(P412405-06)Water Sampled 12/21/04 20 50 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene ND 050 ^ <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " ^ <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " ^ <br /> Ethylbenzene ND 0 50 ^ <br /> Ethyl tert-butyl ether ND 1 0 ^ <br /> Methyl tent-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 ^ " <br /> Surrogate Dibromofluoromeihane 100% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 116% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromo luorobenzene 107% 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 wei weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 18 <br />