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1455 McDowell Bled,North Ste <br /> Sequoia <br /> '''�+■�"' Petaluma CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P412280 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50265 Reported <br /> Sacrarnento CA,95833 Project Manager Vernon P Elarth 01/05/05 08 03 <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 /> ATR-5(P412280-01)Water Sampled 12/13/04 11 40 Received 12/14/0411 30 <br /> Tert-amyl methyl ether ND 10 ugh 1 4120496 12/24/04 12/24/04 EPA 8260E <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 ^ " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 5 1 050 " <br /> Toluene ND 050 " ^ <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate Drbromofluoromethone 96% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 102% 74-135 " " <br /> WSurragate Toluene-d8 95% 84-179 orurrogate 4-Bromofluorobenzene 100% 86-119 <br /> ATR-8(P412280-02)Water Sampled 12/13/04 11 25 Received 12/14/04 11 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4120496 12/24/04 12/24/04 EPA 8260B <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " ^ <br /> Dr-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 13 050 " ^ <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dtbromofluoromethane 93% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 103% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 <br /> Surrogate 4-Bromofluorobenzene 100% 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 enirrety <br /> Page 4 of 8 <br />