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! � ll Blvd,North Ste D <br /> Sequoia 1455 McDowePetaluma,CA 94954 <br /> Analytical (707)792.1865 <br /> FAX(707)792.0342 <br /> www.scquoislabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 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 Batch Prepared Analyzed Method Notes <br /> MW-7(P406178-07)Water Sampled:06108/0405-.11 Received:0610810411:30 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4060423 06/18/04 06/18/04 EPA 8260B <br /> Benzene ND 0.50 " " " " 1. <br /> Tert-butyl alcohol ND 20 " " 1. <br /> Di-isopropyl ether ND 1.0 " IF <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane 2.1 0.50 " <br /> Ethanol ND 100 1. <br /> Ethylbenzene ND 0,50 IF <br /> Ethyl tert-butyl ether ND LO IF <br /> " <br /> Methyl tert-butyl ether ND 0.50 + <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> arrogate:Dibromofluoromethane 112% 84-122 ,I <br /> urrogate: 1,2-Dichloroethane-d4 1169,13 74-135 " <br /> Surrogate: Toluene-d8 104% 84-119 " IF IF <br /> Surrogate:4-Bromofluorobenzene 104% 86-119 <br /> MW-8(P406178-08)Water Sampled:06/08/04 06:11 Received:06/08/04 11:30 <br /> Tert-amyl methyl ether ND 20 ug/l 20 4060423 06/18/04 06/18/04 EPA 8260B <br /> Benzene 990 10 1. 1 " <br /> Tert-butyl alcohol ND 400 <br /> Di-isopropyl ether ND 20 <br /> 1,2-Dibromoethane(EDB) ND 10 <br /> 1,2-Dichloroethane 34 10 " <br /> Ethanol ND 2000 <br /> Ethylbenzene ND 10 IF <br /> Ethyl tert-butyl ether ND 20 <br /> Toluene ND 10 " " IF „ <br /> Xylenes(total) ND 10 IF " <br /> Surrogate.,Dibromofluoromethane 107% 84-122 IF 11 <br /> Surrogate: 1,2-Dichloroethane-d4 112% 74-135 IF 11 <br /> Surrogate: Toluene-d8 102% 84-119 ” IF " IF <br /> Surrogate:4-Bromofluorobenzene 100% 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 stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> Page 10 of 37 <br />