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4a <br /> 4DMorganSequoia 885JuvisDrive <br /> Hill CA 95037 <br /> Analytical FAX(408)776 9500 <br /> (408)782 6308 <br /> www sequolalabs corn <br /> URS Corporation[ArcoI I Project ARCO#6020,Manteca,CA MPAI407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCI V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/14/06 09 04 <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-11 (MPA1407-07)Water Sampled 01/25/06 11 55 Received 01/27/06 08 30 <br /> 1,3-Dichloropropane ND 050 ug/l 1 6BO8009 02/08/06 02/08/06 EPA 8260D <br /> 2,2-Dichloropropane ND 20 <br /> 1,1-Dichloropropene ND 050 <br /> Ethylbenzene ND 050 „ <br /> Hexachlorobutadiene ND 2 0 <br /> Isopropylbenzene ND 050 <br /> Methylene chloride ND 0 50 <br /> Naphthalene ND 5 0 " « <br /> p-Isopropyltoluene ND 050 „ <br /> n-Propylbenzene ND 050 <br /> Styrene ND 050 <br /> 1,1,1,2-Tetrachloroethane ND 050 <br /> 1,1,2,2-Tetrachloroethane ND 050 " <br /> Tetrachloroethene ND 050 " <br /> Wluene ND 050 <br /> ,3-Tnchlorobenzene ND 050 , <br /> 2,4-Tri chlorobenzene ND 050 „ <br /> 1,1,1-Trichloroethane ND 050 <br /> 1,1,2-Trichloroethane ND 050 „ <br /> Trichloroethene ND 050 <br /> Trichlorofluoromethane ND 050 <br /> 1,2,3-Tnehloropropane ND 050 <br /> 1,2,4-Trimethylbenzene ND 050 <br /> 1,3,5-Trimethylbenzene ND 050 <br /> Vinyl chloride ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 113% 65-130 " <br /> Surrogate 12-Dichloroethane-d4 115% 60-135 " <br /> Surrogate Toluene-d8 104% 70-120 <br /> Surrogate 4-Sromofluorobenzene 92% 70-120 <br /> Sequoia Analytical-Morgan Hill <br /> g The results in this report apply to the samples analyzed in accordance with the chant 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 16 of 28 <br />