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1455 McDowell Blvd,North Ste <br /> 4DSequoia Petaluma,CA 949544 <br /> (707)792-1865 i <br /> Analytical FAX(707)792-0342 <br /> www sequoealabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P312737 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/04 19 10 <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 /> ATR-5(P312737-03)Water Sampled 12.124103 13 30 Received 12/29/03 13 15 <br /> Tert-amyl methyl ether ND 20 ug/I 2 4010065 01/07/04 01/07/04 EPA 8260B <br /> Benzene ND 10 <br /> Tert-butyl alcohol ND 40 <br /> Di-isopropyl ether ND 2 0 " <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 <br /> Ethyl tent-butyl ether ND 2 0 <br /> Methyl tent-butyl ether 57 1 0 " <br /> Toluene ND 10 <br /> Xylenes(total) ND 1 0 <br /> Surrogate Dibromofluoromethane 112% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> ATR-7(P312737-04)Water Sampled 12/24/03 12 55 Received 12/29/03 13 15 <br /> Teri-amyl methyl ether ND 1 0 UO 1 4010065 01/07/04 01/07/04 EPA 826013 <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 ^ " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " ^ <br /> Ethyl tert-butyl ether ND 1 0 ^ <br /> Methyl ter(-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromoffuoromethane 111 % 84-121 " <br /> Surrogate 1 2-Drchloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> . Sequoia Analytical-Petaluma The results in this report apply 10 the samples analyzed in accordance wrth 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 5 of 10 <br />