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Sequoia 1455 McDowell Blvd North Ste D <br /> Petal954 <br /> (70 <br /> (707)79 79 2-1-1865 <br /> AFAX(707)M-0342Analytical <br /> www.seuoiala6s.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager; Vernon P.Elarth 03/12/04 16:07 <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-3(P402594-01)Water Sampled:0212610410:35 Received:02/27/0407:10 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4030145 03/05/04 03/06/04 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 tent-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 101 % 84-122 " <br /> Surrogate:1,2-Dichloroelhane-d4 97% 74-135 " <br /> �urrogate:Toluene-d8 86% 84-119 <br /> Surrogate.-4-Bromojluorobenzene 115% 86-119 <br /> NEW-4(P402594-02)Water Sampled:0212610410:55 Received:02/2710407-.10 <br /> Tert-amyl methyl ether ND 1.0 ugli 1 4030184 03/09/04 03/09/04 EPA 8260B <br /> Benzene ND 0.50 " <br /> Teri-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 109% 74-135 " <br /> Surrogate:Toluene-d8 105% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 96% 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 stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 4 of 11 <br />