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• e`q U Ola 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 44954 <br /> 4D (707)792-1865 <br /> FAX�► analytical ww,seg07}labs.c42 <br /> • www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <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(P309139-07)Water Sampled: 09/09/03 02:48 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3090481 09/22/03 09/22/03 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 2.0 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 103% 84-122 <br /> rrogate: 1,2-Dichloroethane-d4 95% 74-135 <br /> rrogate: Toluene-d8 100% 84-119 <br /> Surrogate:4-Bromofluorobenzene 101 % 86-119 <br /> MW-8(P309139-08)Water Sampled:09/09/03 03:53 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND 2000 ug/1 2000 3090442 09/19/03 09/19/03 EPA 8260B <br /> Benzene 1100 1000 " <br /> Tert-butyl alcohol ND 40000 " <br /> Di-isopropyl ether ND 2000 " <br /> 1,2-Dibromoethane(EDB) ND 1000 " <br /> 1,2-Dichloroethane ND 1000 " <br /> i <br /> Ethanol ND 200000 " <br /> Ethylbenzene ND 1000 " <br /> Ethyl tert-butyl ether ND 2000 <br /> Methyl tert-butyl ether 23000 1000 " <br /> Toluene ND 1000 " <br /> Xylenes(total) ND 1000 " <br /> Surrogate:Dibrotnofluoromethane 107% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 102% 74-135 <br /> Surrogate: Toluene-d8 94% 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 staled, results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 15 of 38 <br />