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Sequoia 1455 McDowePll North Ste D <br /> Analytical urnk CA 94954 <br /> (707)792- 342 <br /> y FAX{707)792-0342 <br /> www sequomlabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Repotting <br /> Analyte Result Lurut Units Dilution Batcb Prepared Analyzed Method Notes <br /> VW-12(P306252-10)Water Sampled-06/11/0311 00 Received.06/1210311-45 <br /> Tert-amyl methyl ether ND 10 119/1 1 3060397 06/17/03 06/17/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 ^ " <br /> Ethyl tert-butyl ether ND 10 « „ <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dtbromofluoromethane 111 % 84-122 <br /> Surrogate 12-Dichloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 " <br /> MS-IA(P306252-11)Water Sampled 06/11/03 08 00 Received.06/12/03 11 45 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060630 06/24/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 ^ ^ « ^ <br /> WY, <br /> of ND 100 ^ <br /> tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 055 050 " ^ „ « <br /> Surrogate Dibromofluoromethane 91 % 84-122 ^ a ^ <br /> Surrogate 42-Diehloroethane-d4 97% 74-135 <br /> Surrogate Toluene-d8 103°%a 84-119 " ^ <br /> MS-1B(P306252-12)Water Sampled 06/11/03 07.31 Received 06/12/0311 45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060630 06/24/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND10 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 1 0 ^ „ ^ ^ n ^ <br /> Methyl tert-butyl ether ND 0 50 <br /> Surrogate Dibromofluoromethane 95% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 94% 74-135 <br /> Surrogate Toluene-d8 109% 84-119 " ^ <br /> �uoia 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 14 of 27 <br />