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Ste D <br /> Sequoia t455McDowPBlvd, <br /> uma CA <br /> a— Petaluma 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrtm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernonl? 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-5(P503073-05)Water Sampled 03/02/0515 00 Received 03/03/05 10 35 <br /> Teri-amyl methyl ether ND 10 ug/l 1 5030147 03/14/05 03/14/05 EPA 8260B <br /> Benzene ND 050 <br /> Teri-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 tett-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether is 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 1 2 050 " <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 101 % 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 I, <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 <br /> ATR-6(P503073-06)Water Sampled 03/02/05 13 25 Received 03/03/05 10 35 <br /> Tert-amyl methyl ether ND 10 ug11 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(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <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 98% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 103% 84-1.19 " <br /> Surrogate 4-Bromofluarobenzene 707% 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 19 <br />