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41) <br /> Sequoia 1455 McDowelt Blvd ,NorthCA Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(107)792-0342 <br /> 0 www sequptalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 I7 56 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reportmg <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Not <br /> MS-2A(P406495-07)Water Sampled 06/23/04 06 40 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 ue i 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 ^ ^ <br /> 1,2-Dichloroethane ND 050 ^ ^ <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate 1,2-Dichloroethane-d4 109 010 78-129 " <br /> MS-211(P406495-08)Water Sampled 06/23/040738 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 0 50 ugA 1 4GO7003 07/07/04 07/07/04 BPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> handl ND 100 " <br /> yl tert-butyl ether ND 050 ^ <br /> ethyl tert-butyl ether ND 050 ^ " <br /> Surrogate 1,2-Dichloroethane-d4 109% 78-129 " <br /> MS-3A(P406495-09)Water Sampled 06/2310406 15 Received 06/25/04 09 30 <br /> tert-Amyl methyl ether ND 050 uo 1 4GO7003 07/07/04 07/07/04 EPA 82608 <br /> tert-Butyl alcohol ND 20 ^ „ <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dichloroethane ND 0 50 ^ ^ <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 050 <br /> Methyl tert-butyl ether 33 0 50 " ^ <br /> Surrogate 12-Dichloroethane-d4 110% 78-129 <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 slated results are reported on a wet weight basis <br /> . 77ris analytical report must be reproduced in its entirety <br /> Page 19 of 41 <br />