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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma, 94954 <br /> (707)79 2-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoralabs cum <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 04/05/04 11 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-7(P403320-07)Water Sampled 03/12/0413 05 Received 03/12/04 15 50 <br /> Ethanol ND I00 ug/l 1 4C25003 03/25/04 03/26/04 EPA 9260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " n <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 1 2-Dtchloroethane-d4 948% 78-129 " <br /> ATR-8(P403320-08)Water Sampled 03/12/04 12 50 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/] 1 4C25003 03/25/04 03/26/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " <br /> -Amyl methyl ether ND 050 <br /> ogate 1,2-Dtchloroethane-d4 970% 78-129 <br /> ATR-9(P403320-09)Water Sampled 03112/041030 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/1 1 4C25003 03/25/04 03/26/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 <br /> Surrogate 12-Dichloroethane-d4 958% 78-12FF <br /> 9 <br /> uoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance wrth the chain of <br /> custody document Unless otherwise stated results are reported on a wet wetght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 16 <br />