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a— ) (7P 1455 McDowellBlvd CA Ste <br /> Sequoia Petaluma,CA 949544 <br /> Analytical FAX <br /> 07)7921865 <br /> (707)792-0342 <br /> www sequo,alabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-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 L,e,ut Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-1 (P403188-01)Water Sampled 03/08/04 06 07 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug!] 1 4030532 03/19/04 03/19/04 EPA 8260B <br /> Trichloroethene 16 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 063 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 13 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 5 9 050 " <br /> Ethyl tert-butyl ether ND 1 Q " <br /> Methyl tert-butyl ether 19 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) 33 0 50 " <br /> Surrogate Dibromofluoromethane 112% 84-122O <br /> " <br /> rrogate 12-Dichloroethane-d4 121 % 74-135 <br /> urrogate Toluene-d8 112% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 133% 86-119 Sol <br /> VW-2(P403188-02)Water Sampled 03/08/04 03 53 Received 03/10/04 08 00 <br /> Tetrachloroethene 2 3 0 50 ug/l 1 4030532 03/19/04 03/19/04 EPA 82605 <br /> Trichloroethene 14 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 078 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 28 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 113% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 117% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 108% 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 srated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 34 <br />