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Sequoia 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 /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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 /> VW-10(P312285-17)Water Sampled 12/10/03 03 09 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ugll 10 3120686 12/24/03 12/24/03 EPA 8260B <br /> Benzene 2700 50 " „ " „ E <br /> Tert-butyl alcohol ND 200 <br /> Di-isopropyl ether ND 10 " ^ <br /> 1,2-Dichloroethane 97 50 <br /> Ethanol ND 1000 <br /> Ethylbenzene 1900 50 " " E <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 50 <br /> Toluene 620 50 ^ " " E <br /> Xylenes(total) 5300 so " " E <br /> Surrogate DrbromoJluoromethane 98% 84-122 <br /> Surrogate 12-Drchloroethane-d4 100% 74-135 " <br /> 6urrogate Toluene-d8 107% 84-119 <br /> urrogate 4-Bromofluorobenzene 108% 86-119 " <br /> VW-10(P312285-17RE1)Water Sampled 12/10/03 03 09 Received 12/10/03 09 00 HT4 4 <br /> Benzene 3200 50 ugA 100 3120709 12/24/03 12/25/03 EPA 8260B <br /> Ethylbenzene 2100 50 " " ^ <br /> Toluene 720 50 " <br /> Xylenes(total) 6800 50 <br /> Surrogate Dibromo/luoromethane 99% 84-122 <br /> Surrogate 12-Drchloroethane-d4 105% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 <br /> Surrogate 4-Bromofluorobenzene 99% 86-119 " " " „ <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 18 of 35 <br />