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1455 McDowell Blvd,North Ste D <br /> 4D Sequoia Petaluma,GA 94954 <br /> (707)792-1865 <br /> ��► Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(P409397-05RE1)Water Sampled 09/20/04 13 15 Received 09/22/04 15 10 BO,DF <br /> Tert-amyl methyl ether ND 20 ug/l 20 4090752 09/30/04 09/30/04 EPA 9260B <br /> Benzene ND 10 <br /> Tert-butyl alcohol ND 400 <br /> Di-isopropyl ether ND 20 <br /> 1,2-Dtchloroethane ND 10 " <br /> Ethanol ND 2000 » <br /> Ethylbenzene ND 10 " <br /> Ethyl tent-butyl ether ND 20 " <br /> I <br /> Methyl tert-butyl ether ND 10 <br /> Toluene ND 10 <br /> Xylenes(total) ND 10 ^ " <br /> Surrogate Dtbromofluoromethane 125% 84-122 LH <br /> Surrogate 1,2-Dichloroethane-d4 118% 74-135 " <br /> 0rrogate Toluene-d8 102% 84-119 <br /> rrogate 4-Bromof7uorobenzene 112% 86-119 " <br /> MW-6(P409397-06)Water Sampled 09/20/0411 50 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4090738 09/29/04 09/29/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dtchloroethane 15 050 ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 93% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 97% 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 86% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed rn accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a we/weight basis <br /> IsThis analytical report must be reproduced in its entirety <br /> Page 9 of 29 <br />