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izSequoia 1455 McDowell Blvd,North Ste D <br /> _ Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> C <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project Manag-Nemon P.Elarth 04/13/05 09:46 <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 /> MS-3B(P504010-23)WaterSampled:03/28/05 09:35 Received:0313010511:50 <br /> Tert-amyl methyl ether ND 1.0 ugfl 1 5040066 04/07/05 04/07/05 EPA 8260B <br /> Benzene 1.8 0.50 ^ " <br /> Tert-butyl alcohol ND 20 „ <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol 3600 100 " ^ E <br /> Ethylbenzene ND 0.50 <br /> Ethyl Eert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 33 0.54 <br /> Toluene ND 0.50 <br /> Xylenes(total) 0.64 0.50 " ^ <br /> Surrogate:Dibromofluoromethane 107% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 109% 74-135 " <br /> ,.Surrogate:Toluene-d8 97% 84-119 <br /> urrogate:4-Bromofluorobenzene 106% 86-119 " <br /> MS-3B(P504010-23RE1)Water Sampled:03/28/05 09:35 Received:03/30/05 11:50 <br /> Ethanol 3500 1000 u8/1 t0 5040084 04/08/05 04/08/05 EPA 8260B <br /> Surrogate:Dib.romofluoromelhane 100% 84-122 <br /> Surrogate:1,2<Dichloroethane44 100% ' 74-135 " <br /> Surrogate:Toluene-d8 94% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 102% 86-119 " <br /> TB-2130(P504010-24)Water Sampled:03/28/0500:00 Received:03/30/05 11.50 <br /> Ethanol ND 140 ug/l 1 5040080 04/08/05 04/08/05 EPA 8260B <br /> Surrogate:Diliromofluoromethane 101% 84-122 ^ <br /> Surrogate:1,2;Dichloroethane-d4 93% 74-135 " <br /> Surrogate: Toluene-d8 102% 84-119 <br /> Surrogate:4-Bromofluorobeniene 108% 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 18 of 29 <br />