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895 Jams Drive Sequoia Morgan Hill CA 95037037 <br /> a— ) 7 <br /> (408)776 9600 <br /> Analytical FAX(408)782-6308 <br /> J www sequoialabs com <br /> URS Corporation [Arco II Project ARCO#5469, Stockton,CA MN]0470 <br /> 2870 Gateway Oaks Dr, Ste 300 ProjectNumber N/P Reported <br /> Sacramento CA,95833 Project 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-5(MNI0470-03)Water Sampled 09/14/04 06 32 Received 09/15/04 1130 <br /> tert-Amyl methyl ether ND 50 ug/1 10 4123011 09/23/04 09/23/04 EPA 8260B <br /> Benzene ND 5 0 <br /> tert-Butyl alcohol ND 200 <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dtbromoethane(EDB) ND 5 0 <br /> 1,2-Dichloroethane ND 5 0 " <br /> Ethanol ND 1000 " " " is <br /> Ethyl tert-butyl ether ND 5 0 <br /> Ethylbenzene ND 5 0 <br /> Methyl tert-butyl ether 360 5 0 <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Gasoline Range Organics(C4-C 12) ND 500 <br /> Surrogate 12-Dichloroethane-d4 95% 78-129 <br /> 6(M11I0470-04)Water Sampled 09/14/04 07 18 Received 09/15/04 11 30 <br /> tent-Amyl methyl ether ND 250 ug/1 500 4123011 09/23/04 09/23/04 EPA 8260B <br /> Benzene ND 250 " <br /> tert-Butyl alcohol ND 10000 ^ <br /> Di-isopropyl ether ND 250 <br /> 1,2-Dtbromoethane(EDB) ND 250 " <br /> 1,2-Dtchloroethane ND 250 <br /> Ethanol ND 50000 " " " Ic <br /> Ethyl tert-butyl ether ND 250 " <br /> Ethylbenzene ND 250 " <br /> Methyl tert-butyl ether 12000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 <br /> Gasoline Range Organics(C4-C12) ND 25000 " <br /> Surrogate 1,2-Dichloroethane-d4 92% 78-129 " <br /> �oia 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 be reproduced in its entirety <br /> Page 5 of 17 <br />