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Sequoia 885 Jarvis Drive <br /> a_ _� <br /> Morgan HSI] CA 95037037(408)776 9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs corn <br /> 7URS Corporation[Arco II Project ARCO#5469, Stockton,CA MN10470 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number NIP 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-1 (MNI0470-01)Water Sampled 09/14/04 07 05 Received 09/15/04 11 30 <br /> tert-Amyl methyl ether ND 050 ug/I 1 4123011 09/23/04 09/23/04 EPA 8260B <br /> Benzene ND 050 " „ ,. <br /> tert-Butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 <br /> Ethanol ND 100 " " " " IC <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether 50 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1,2-Dtchloroethane-d4 90% 78-129 <br /> (MNI0470-02)Water Sampled 09/14/04 07 49 Received 09/15/04 11 30 <br /> MFL— <br /> tert-Amyl methyl ether ND 250 ug/1 500 4I23011 09/23/04 09/23/04 EPA 8260B <br /> Benzene 2500 250 <br /> tert-Butyl alcohol ND 10000 <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(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 23000 250 <br /> Toluene ND 250 <br /> Xylenes(total) ND 250 <br /> Gasoline Range Organics(C4-C12) 32000 25000 " <br /> Surrogate 1 2-Dtchloroethane-d4 93% 78-129 <br /> �ota Analytical-Morgan Hill The results to 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 4 of 17 <br />