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885 JarDrive <br /> • Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> a— ) Analytical FAX(408)782 6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project ARCO#5469, Stockton, CA MN10470 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Prosect Manager Jay Johnson 09/29/04 17 33 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-9(MN10470-07)Water Sampled 09/14/04 03 39 Received 09/15/04 11 30 <br /> tert-Amyl methyl ether ND 050 ug/I 1 4123011 09123/04 09/24/04 EPA 8260B <br /> Benzene ND 050 ^ ^ <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether 074 050 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane 38 050 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether 15 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 1,2-Dichloroethane-d4 91 % 78-129 or " <br /> 10(MNI0470-08)Water Sampled 09/14/04 04 47 Received 09/15/04 1130 <br /> tert-Amyl methyl ether ND 25 ug/l 5 4123011 09/23/04 09/23/04 EPA 8260B <br /> Benzene ND 25 <br /> tert-Butyl alcohol ND 100 <br /> Di-isopropyl ether ND 25 <br /> 1,2-Dibromoethane(EDB) ND 2 5 <br /> 1,2-Dichloroethane ND 25 ^ <br /> Ethanol ND 500 " " 1C <br /> Ethyl tert-butyl ether ND 2 5 " <br /> Ethylbenzene ND 2 5 " <br /> Methyl tert-butyl ether 100 2 5 <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 <br /> Gasoline Range Organics(C4-C 12) ND 250 <br /> Surrogate 1,2-Dichloroethane-d4 92% 78-129 " <br /> �ota 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 basis <br /> This analytical report must he reproduced in its entirety <br /> Page 7 of 17 <br />