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Sequoia 1455 McDowell Petaluma,CA 949544 <br /> (707)792-1865 <br /> . Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 434,Lodi,CA P310098 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50433 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/03 16 54 <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 /> W-1A(P310098-01)Water Sampled 09/29/03 09 35 Received 09/30/03 16 01 <br /> Tert-amyl methyl ether ND 10 ugtl 1 3100252 10/10/03 10/10/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 112-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 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Drbromofluoromethane 96% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 87% 84-119 " <br /> 0.rrogate 4-Bromofluorobenzene 95% 86-119 " <br /> W-2(P310098-02)Water Sampled 09/29/03 11 30 Received 09/30/03 16 01 <br /> Tert-amyl methyl ether ND I 0 ug/l 1 3100252 10/10/03 10/10/03 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " ^ <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanal 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 Dihromofluoromethane 99% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 97% 74-135 " <br /> Surrogate Toluene-d8 87% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 95% 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 4 of 10 <br />