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1455 McDowell Blvd,North Ste D <br /> 4D Sequoia <br /> Petaluma, <br /> e'a' 707,792 X865 <br /> �IWO Analytical wwsequFAX 7)792-0342 <br /> • www sequoiala6s corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P409397-01)Water Sampled 09/20/04 10 13 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug11 1 4090738 09/29/04 09/29/04 EPA 8260B <br /> Benzene ND 050 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromojluoromethane 90% 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 92% 74-135 " <br /> rrogate Toluene-d8 93% 84-119 <br /> rrogate 4-Bromofluorobenzene 86% 86-119 <br /> MW-2(P409397-02)Water Sampled 09/20/04 13 10 Received 09/22/04 15 10 BO,DF <br /> Tert-amyl methyl ether ND 50 ugA 5 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dtchloroethane 21 2 5 <br /> Ethanol ND 500 <br /> Ethylbenzene ND 2 5 " <br /> Ethyl text-butyl ether ND 5 0 <br /> Methyl tent-butyl ether ND 2 5 " <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 " <br /> Surrogate DibromoJluoromethane 121% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromojluorobenzene 110% 86-119 " <br /> Sequoia Analytical-Petaluma The results to 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 7 of 29 <br />