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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 7 (107)792-1665 <br /> 42 <br /> Analytical www <br /> orn <br /> . www sequrnalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrtm-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 /> VW-12(P409397-18)Water Sampled 09/20/0412 55 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 5 0 11g/1 5 4100058 10/04/04 10/04/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dichloroethane 94 25 " <br /> Ethanol ND 500 <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Drbromofluoromethane 93% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 92% 74-135 " <br /> 18urrogate Toluene-0 105% 84-119 <br /> rrogate 4-Bromofluorobenzene 107% 86-119 " <br /> MS-IA(P409397-19)Water Sampled 09/20/04 10 53 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/I 1 4090752 09/30/04 09/30/04 EPA 8260E <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 1 1 0 50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 <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 Dibromofluoromelhane 122% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-4 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 112% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wtih the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 15 of 29 <br />