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• 1455 McDowell Blvd North Ste D <br /> Sequoia P Petaluma,CA 94954 <br /> a_�_ <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Protect Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <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 /> ATR-7(P503073-07)Water Sampled 03/02/05 11 50 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 1 0 ug!) 1 5030147 03/14/05 03/14/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <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 100% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 103% 74-135 " <br /> urrogate Toluene-d8 102% 84-119 <br /> � " <br /> Surrogate 4-Bromofluorobenzene 109% 86-119 <br /> ATR-8(P503073-08)Water Sampled 03/02/0514 30 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5030147 03/14/05 03/14/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDS) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 ^ <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 113% 86-119 " <br /> Sequoia Analytical -Petaluma The results in this report apply 10 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 /> Page 8 of 19 <br />