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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA95037 <br /> ID (408)776-9600 <br /> Analytical ww.scqAX 8)782-6308 <br /> abs.c m <br /> wHnv.sequoialabs.com <br /> URS Corporation[Arco]I Project:ARCO 95450,Stockton,CA MOE0229 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZN-0001 Reported: <br /> Sacramento CA,95833 Project Manager:]eff Brooks 05/24/05 16:37 <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-2(MOE0229-01)Water Sampled:05/05/05 I1:30 Received:05/07/05 08:30 <br /> Tert-amyl methyl ether ND 1.0 ugli 1 5050103 05118!05 05/18/05 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 tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 7.2 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 103% 84-122 " <br /> .Surrogate:1,2-Dichloroethane-d4 116% 74-135 <br /> Surrogate:Toluene-d8 99% 84419 <br /> Surrogate:4-Bromofluorobenzene 115% 86-119 " <br /> MW-3(MOE0229-02)Water Sampled:05/05/05 10:50 Received:05/07/05 08:30 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 5050103 05YIS105 05/18/05 EPA 8260E <br /> Benzene ND 0.50 " <br /> Ten-butyl alcohol ND 20 " <br /> Di-isopropyi ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> i <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 100% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 112% 74-135 " <br /> Surrogate:Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 120% 86-119 " LH <br /> I <br /> i <br /> Sequoia Analytical-Morgan Hill 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 9 <br />