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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 950375037 <br /> (408)776 9600 <br /> FAX 8) 82 8� Analytical wwwseguotalabscom <br /> 0 <br /> URS Corporation[Arco II Project ARCO#5469, Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <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-1 (M000479-01)Water Sampled 03/16/05 08 00 Received 03/17/05 11 09 <br /> tert-Amyl methyl ether ND 0 50 ug/l 1 5C25006 03/25/05 03/25/05 EPA 82608 <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether 6 0 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> 11 <br /> ogate 12-Dichloroethane-d4 103% 60-135 01W-2(M000479-02)Water Sampled 03/16/05 06 42 Received 03/17/05 11 09 <br /> tert-Amyl methyl ether ND 0 50 ug/l 1 5C25006 03/25/05 03/25/05 EPA 8260B <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 104% 60-135 <br /> oia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the charn 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 30 <br />