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a <br /> '"`ice' � 1455 McDowell Blvd,North Ste D <br /> Sequoia. Petaltana,CA 94954 4D707)792 1665 <br /> 1W Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> 4� <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 ProjectNumber Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 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 /> MS IB(P403188-19)Water Sampled 03/09/04 05 02 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug/1 1 4030564 03/19/04 03/19/04 EPA 8260B <br /> Tnchloroethene ND 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 25 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 10 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 89 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 89% 84-122 " <br /> 0rrogate I 1-Dtchloroethane-d4 95% 74-135 <br /> arrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 92% 86-119 " <br /> MS 2A(P403188-20)Water Sampled 03/09/04 05 15 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug/1 1 4030564 03/19/04 03/20/04 EPA 8260B <br /> Trichloroethene 054 050 " <br /> Tert-amyl methyl ether ND 1 0 <br /> Benzene 33 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 2 2 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 7 1 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 3 8 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 95% 84-111 » <br /> Surrogate 12-Dtchloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 98% 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 /> Page 20 of 34 <br />