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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> ,6010, Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> I <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/0311 59 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> AnalyYe Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-12(P309471-18)Water Sampled 09/24/03 07 15 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ug/I 1 3100164 10/07/03 10/08/03 EPA 826013 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <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 Dibromofluoromethane 98% 84-111 ~ ~ <br /> Surrogate 12-Dichloroethane-d4 86% 74-135 ~ " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> VW-12(P309471-18RE1)Water Sampled 09/24/03 07 15 Received 09/24/03 08 30 <br /> dolkEthanol ND 100 ug/l 1 3100167 10/08/03 10/08/03 EPA 82608 <br /> urrogate Dibromofluoromethane 111% 84-121 " <br /> Surrogate 12-Dichloroethane-d4 109% 74-135 ~ <br /> Surrogate Toluene-d8 102% 84-119 " <br /> MS-1A(P309471-19)Water Sampled 09/24/03 03 47 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3100164 10/07/03 10/08/03 EPA 8260B <br /> Benzene ND 050 ^ <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 <br /> Ethylbenzenc ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 051 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 97% 84-122 <br /> Surrogate 12-Dichloroethane-d4 88% 74-135 ~ <br /> Surrogate Toluene-d8 104% 84-119 ~ <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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 30 <br />