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a <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,!D (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-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 2B(P403188-21)Water Sampled 03/09/04 05 30 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug/l 1 4030564 03/19/04 03/20/04 EPA 8260B <br /> Trichloroethene 059 050 " <br /> Teri-amyl methyl ether ND 10 " <br /> Benzene 29 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 6 4 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 5 0 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 90% 84-122 " <br /> *rrogate 1,2-Dichloroethane-d4 90% 74-135 ; <br /> urrogate Toluene-d8 102% 84-119 <br /> Surrogate 4-Bromofluorobenzene 94% 86-119 " <br /> MS 3A(P403188-22)Water Sampled 03/09/04 05 44 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 0 50 ugll 1 4030564 03/19/04 03/20/04 EPA 8260B <br /> Trichloroethene 054 0 50 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 39 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Etbylbenzene 8 8 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 2 9 0 50 " <br /> Toluene 057 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 94% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 702% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 96% 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 staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 21 of 34 <br />