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1455 McDowell Blvd,North Ste D <br /> (D Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www segiioialabs coni <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <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 /> MW-11 (P406056-07)Water Sampled 05/26/04 12 50 Received 05!28!0416 05 <br /> Ethanol ND 100 ugA 1 4FO7003 06/07/04 06/08/04 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 /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDS) ND 050 " <br /> Surrogate I2-Dichloroethane-d4 121 % 78-129 " <br /> MW-12(P406056-08)Water Sampled 05/26/04 10 40 Received 05/28/04 16 05 <br /> Ethanol ND 100 ug/I I 4FO7003 06/07/04 06/08/04 EPA 8260E <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 /> 1,2-Dichloroethane ND 050 „ <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> Surrogate 1,2-Dichloroethane44 119% 78-129 11 " <br /> MW-13D(P406056-09)Water Sampled 05/26/04 12 20 Received 05/28/04 16 05 <br /> Ethanol ND 100 ugfl 1 4FO7003 06/07/04 06/08/04 EPA 8260E <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 25 050 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> Surrogate 12-Dichloroelhane-d4 107% 78-119 " <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 entirety <br /> Page 10 of 20 <br />