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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,a— ) (707)792 1655 <br /> Analytical FAX(707)792-0342 <br /> www sequoiatabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 14 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-8(P403188-07)Water Sampled 03/08/04 04 47 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 25 ug/1 5 4030563 03/19/04 03!20/04 EPA 8260B <br /> Tnehloroethene 25 2 5 " <br /> Tert-amyl methyl ether ND 5 0 " <br /> Benzene 120 25 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dichloroethane ND 2 5 " <br /> Ethanol ND 500 <br /> Ethylbenzene 64 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> urrogate 12-Dichloroethane-d4 123% 74-135 <br /> urrogate Toluene-d8 105% 84-119 <br /> Surrogate 4-Bromofluorobenzene 114% 86-119 " <br /> I <br /> i <br /> VW-10(P403188-08)Water Sampled 03/08/04 04 21 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 2 5 ug!] 5 4030563 03/19/04 03120/04 EPA 82608 <br /> Trichloroethene 25 2 5 j <br /> Tert-amyl methyl ether ND 5 0 " <br /> Benzene 110 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 500 " <br /> Ethylbenzene 62 25 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate Dibromofluoromethane 114% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 126% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 115% 86-119 " <br /> I <br /> i <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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> i <br /> Page 14 of 34 <br />