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vd <br /> Sequoia 1455 McDowePl�iu ANorth <br /> CA 94954 <br /> • '���M'� (707)792-1865 <br /> r Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <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 /> MW-7(P403321-07)Water Sampled 03/10/04 06 50 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4030678 03/24/04 03/24/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <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 DibroinoJluoromethane 108% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 127% 74435 " <br /> ogate Toluene-d8 91 % 84-119 <br /> ror;ate 4-Bromofluorobenzene 97% 86-119 " <br /> VW-lB(P403321-08)Water Sampled 03/10/04 05 22 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 100 ug/1 100 4030678 03/24/04 03/24/04 EPA 8260B <br /> Benzene ND 50 / P 1. " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 2000 50 " <br /> Toluene ND 50-1 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dtbromofluoromethane 111 % 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 133% 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 " <br /> �uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 15 <br />