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1455 McDowell Blvd Norah Ste <br /> (D Sequoia Petaluma,cA94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reportmg <br /> Anakyte Result Limit Uluts Wution Batch Prepared Analyzed Method Note <br /> MW-1 (P504013-01)Water Sampled 03/30/05 14 44 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 20 ug/I 20 5040103 04/12/05 04/12/05 EPA 8260B <br /> Benzene 460 10 <br /> Tert-butyl alcohol ND 400 <br /> Di-isopropyl ether ND 20 " <br /> 1,2-Dibromoethane(EDB) ND 10 <br /> 1,2-Dichloroethane ND 10 " <br /> Ethanol ND 2000 <br /> Ethylbenzene 510 10 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 880. 10 " <br /> Toluene 1S 10 " <br /> Xylenes(total) 1900 10 <br /> Surrogate Dibromofluoromethone 101 % 84-112 " <br /> Surrogate 1,2-Dichloroethane-d4 96% 74-135 " <br /> , I <br /> urrogate Toluene-d8 99% 84-119 11 II <br /> Surrogate 4-Bromofluorobenzene 109% 86-119 <br /> MW-2(P504013-02)Water Sampled 03/30/05 18 21 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5040103 04/12/05 04/12/05 EPA 8260E <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol 320 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) 093 050 <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 12-Diehloroethane-d4 92% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 5 of20 <br />