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885 Jarvis Dr <br /> Sequoia MarganHill,CA95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequolalabs can, <br /> URS Corporation[11 Project ARCO#6020,Manteca,CA MLL0107 <br /> 2870 Gateway Oaks Dr,,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vern El., <br /> 12/31/02 08 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Linut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(MLL0107-05)Water Sampled 11/27/021020 Received 12/02/02 16 50 T A-01 <br /> tert-Butyl alcohol ND 20 ug/l 1 2L10015 12/10/02 12/11/02 EPA 8260B <br /> Methyl tert-butyl ether ND 050 0-09 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C6-Cl0) ND 50 " <br /> Surrogate 1 2-Dxchloroethane-d4 916% 78-129 " <br /> MW-10(MLL0107-06)Water Sampled 11/27/02 08 30 Received 12/02/02 16 50 A-01 <br /> tert-Butyl alcohol ND 20 ug/1 1 2L10015 12/10/02 12/11/02 EPA 8260E <br /> iftethyl tert-butyl ether ND 0 50 0-09 <br /> qqWi-isopropyl ether ND 0 50 " <br /> EthyI tert-butyl ether ND 0 50 " <br /> tert-Amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene 074 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate 12-Drchloroethane-d4 902% 78-129 " <br /> Sequoia Analytical-Morgan Hill 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 pasts <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 9 <br />