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1455 McDowe <br /> Sequoia Petalull Blvd,North Ste ma,CA 949544 <br /> (707)792-1865 <br /> IW Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P305040 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 19 <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 /> MW-7 P305040-03 Water Sampled 04/28/03 15 25 Received 05/01/03 16 00 <br /> Tert-amyl methyl ether ND 1 0 ugA I 3050181 05/07/03 05/07/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 ^ " <br /> Di-isopropyl ether ND 1 0 ^ " <br /> I32-Dibromoethane(EDB) ND 050 " ^ <br /> 1,2-Dtchloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 <br /> Surrozate Debromofluoromethane 96% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 90% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 " <br /> MW-8 P305040-04 Water Sampled 04/28/03 15 55 Received 05/01/03 16 00 <br /> Tert-amyl methyl ether ND 10 ugn 1 3050181 05/07/03 05/07/03 EPA 8260E <br /> Tert-butyl alcohol ND 20 <br /> 0'-isopropyl ether ND 10 <br /> 2-Dtbromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 <br /> Ethanol ND 100 " ^ <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tent-butyl ether ND 050 <br /> Surrogate Dibromofluoramethane 97% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 92% 74-135 <br /> Surrogate Toluene-d8 98% 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis Thus analytical report must be reproduced to its entirety <br /> Page 6 of 12 <br />