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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> J <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-9(P305380-09)Water Sampled:0511910304:58 Received:05/19/03 11:45 <br /> Methyl tert-butyl ether ND 0.50 ug/1 1 3060010 06/02/03 06/02/03 EPA 8260B <br /> Surrogate:Dibromoflucromethane 93% 84-122 " 11 " <br /> Surrogate: 1,2-Dichloroethane-d4 86% 74-135 " 11 " 11 <br /> Surrogate: Toluene-d8 101 % 84-119 " 11 IF <br /> MW-9(P305380-09RE1)Water Sampled:05119/0304:58 Received:05/19/03 11:45 <br /> Tert-amyl methyl ether ND 1.0 ugll 1 3050783 05/31/03 05/31/03 EPA 8260E <br /> Tert-butyl alcohol ND 20 " " " " 11 " <br /> Di-isopropyl ether 1.3 1.0 " " " " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " " " " <br /> 1,2-Dichloroethane 7.1 0.50 " " <br /> Ethanol ND 100 " <br /> Ethyl tent-butyl ether ND 1.0 " <br /> rrogate:Dibromofluoromethane 93% 84-122 <br /> rrogate: 1,2-Dichloroethane-d4 98% 74-135 <br /> Surrogate: Toluene-d8 98% 84-119 <br /> MW-10(P305380-10)Water Sampled:05/19/03 06:00 Received:05/19/03 11:45 <br /> Tert-amyl methyl ether ND 2.0 ug/l 2 3050783 05/31/03 05/31/03 EPA 8260B <br /> Tert-butyl alcohol ND 40 IF " 11 FF <br /> Di-isopropyl ether ND 2.0 1. 1. " <br /> 1,2-Dibromoethane(EDB) ND 1.0 FF " <br /> 1,2-Dichloroethane ND 1.0 11 " " <br /> Ethanol ND 200 F, FF " " <br /> Ethyl tert-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether 80 1.4 " <br /> Surrogate:Dibromofluoromethane 93% 84-122 oo " <br /> Surrogate: 1,2-Dichloroethane-d4 97% 74-135 " <br /> Surrogate: Toluene-d8 98% 84-119 " F, <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> 46 <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 17 01'36 <br />