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"pair 1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> " Analytical FAX(707)792.0342 <br /> wwwsequoialabs.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-1(P309139-01)Water Sampled:09/09/03 06:13 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND 1.0 ug/1 1 3090409 09/18/03 09/18/03 EPA 8260E <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 5.9 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 104% 84-122 " <br /> W <br /> rogate: 1,2-Dichloroethane-d4 114% 74-135rogate: Toluene-d8 94% 84-119 <br /> Surrogate:4-Bromofluorobenzene 102% 86-119 " <br /> MW-2(P309139-02)Water Sampled:09/09/03 05:09 Received:09/09/03 10:20 <br /> Tert-amyl methyl ether ND 1.0 ug/I 1 3090409 09/18/03 09/18/03 EPA 82608 <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 109% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 118% 74-135 <br /> Surrogate: Toluene-d8 93% 84-119 " <br /> Surrogate.4-Bromofluorobenzene 108% 86-119 " <br /> Sequoia <br /> quoia 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 12 of 38 <br />