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8851 CA 037 <br /> Sequoia Morgan Hill CA 955037 <br /> a- ) (408)776-9600 <br /> Analytical FAX(408)7826308 <br /> www sequotalabs com <br /> URS Corporation fArcoII 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-4(M000479-04RE1)Water Sampled 03/16/05 08 10 Received 03/17/05 11 09 <br /> Methyl tert-butyl ether 4600 50 ug/l 100 5C29006 03/29/05 03/29/05 EPA 8260E <br /> Surrogate 1 2-Dtchloroethane-d4 113 % 60-135 " <br /> MW-5(M000479-05)Water Sampled 03/16/05 07 34 Received 03/17/05 11 09 <br /> tert-Amyl methyl ether ND 2 5 ug/1 5 5C29006 03/29/05 03/29/05 EPA 8260E <br /> Benzene ND 25 " <br /> tert-Butyl alcohol ND 100 " <br /> Di-Isopropyl ether ND 25 " <br /> 1,2-Dlbromoethane(EDB) ND 25 " <br /> 1,2-Dtchloroethane ND 2 5 " <br /> Ethanol ND 500 " <br /> Ethyl ter-butyl ether ND 2 5 " <br /> Ethylbenzene ND 2 5 " <br /> thyl tert-butyl ether 180 2 5 " <br /> ne ND 2 5 " <br /> nes(total) ND 2 5 <br /> Gasoline Range Organics(C4-C12) 280 250 PV <br /> Surrogate 1,2-Dtchloroethane-d4 III % 60-135 " <br /> MW-6(M000479-06)Water Sampled 03/16/05 06 15 Received 03/17/05 11 09 <br /> tent-Amyl methyl ether ND 10 ug/I 20 5C29006 03/29/05 03/29/05 EPA 8260B <br /> Benzene ND 10 " <br /> tert-Butyl alcohol ND 400 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dlbromoethane(EDB) ND 10 " <br /> 1,2-Dtchloroethane ND 10 " <br /> Ethanol ND 2000 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Ethylbenzene ND 10 " <br /> Methyl tert-butyl ether 1500 10 " <br /> Toluene ND 10 " <br /> Xylenes(total) ND 10 " <br /> Gasoline Range Organics(C4-C12) 1800 1000 PV <br /> Surrogate 1 2-Dtchloroethane-d4 112% 60-135 " <br /> uola 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 bans <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 30 <br />