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�' °� Sequoia Bea 1455 McDowell Blvd,North Ste D <br /> tel` Petaluma,CA 94954 <br /> Analytical (747)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: W1t36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Balch Prepan:d Analyzed Method Notes <br /> MW-1(P406178-01)Water Sampled:06/08/04 09:12 Received:06/08/041I:30 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4060379 06/16/04 06/16/04 EPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 5.7 0.50 <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> 0urrogate:Dibromofluoromethane 112% 84-122 <br /> urrogate: 1,2-Dichloroethane-d4 113% 74-135 <br /> Surrogate: Toluene-d8 111 % 84-119 <br /> Surrogate:4-Bromofluorobenzene 106% 86-119 <br /> MW-2(P406178-02)Water Sampled:06/08/04 07:02 Received:06/08/04 11:30 <br /> Ten-amyl methyl ether ND 1.0 ug/1 1 4060379 06/16/04 06/16/04 EPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 112% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 114% 74-135 <br /> Surrogate: Toluene-d8 112% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 107% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise slated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> Page 7 of 37 <br />