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Sequoia 985 Jarvis Drive <br /> 41") Morgan Hit],CA 95037 <br /> Analytical (A0S)772-9508 <br /> FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[Arco]1 Project ARCO#6020,Manteca,CA 1%4PA1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC1 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-5(MPA1407-01)Water Sampled 01/25/06 12 10 Received 01/27/06 08 30 <br /> Isopropylbenzene ND 050 ug/1 1 6BO8009 02/08/06 02/08/06 EPA 8260B <br /> Methylene chloride ND 050 <br /> Naphthalene ND 50 <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 /> Toluene ND 050 " <br /> 1,2,3-Trichlorobenzene ND 050 " <br /> 1,2,4-Trichlorobenzene ND 0 50 <br /> 1,1,1-Trichloroethane ND 050 " <br /> 1,1,2-Trichloroethane ND 050 <br /> ichloroethene ND 050 <br /> ichlorofluoromethane ND 050 <br /> 1,2,3-Tnchloropropane 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 112% 65-130 " <br /> Surrogate 12-Dichloroethane-d4 116% 60-135 " <br /> Surrogate Toluene-d& 104% 70-120 „ <br /> Surrogate 4-Brom0fluorobenzene 98% 70-120 <br /> I <br /> I <br /> Sequoia 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 4 of 28 <br />