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4D 1455 McDowell Blvd North Ste D <br /> Sequoia P Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> • www sequotalabs tom <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P402468-01)Water Sampled 02/16/0413 45 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 10 ug/I 1 4020577 02/26/04 02/26/04 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 98% 84-111 " <br /> Surrogate 12-Dichloroethane-d4 101 % 74-135 " <br /> �urrogate Toluene-d8 97% 84-119 i <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> MW-6(P402408-02)Water Sampled 02/16/0411 25 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 5 0 ug/1 5 4020577 02/26/04 02/26/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 <br /> 1,2-Dibromoethane(EDB) ND 2 5 " <br /> 1,2-Dichloroethane ND 2 5 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether 59 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Dibromofluoromethane 95% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <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 7 of 18 <br />