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arvis Drive <br /> -..�.••1 Sequoia BSSlCA95037 <br /> Morgan HtEI CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782 6308 <br /> • u+ww sequatalabs com <br /> URS Corporation[ArcoI Project ARCO#6020,Manteca,CA MPA 1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 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-7(MPA1407-03)Water Sampled 01/25/06 12 45 Received 01/27/06 08 30 <br /> 1,3-Dtchloropropane ND 050 ug/l E 6BO8009 02/08/06 02/08/06 EPA 8260B <br /> 2,2-Dtchloropropane ND 20 „ <br /> I,1-Dichloropropene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Hexachlorobutadiene ND 20 <br /> Isopropylbenzene ND 0 50 <br /> Methylene chloride ND 050 " <br /> Naphthalene ND 5 0 <br /> p-Isopropyltoluene ND 0 50 <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 /> � <br /> oluene ND 050 j <br /> 2,3-Trichlorobenzene ND 050 <br /> 1,2,4-Tnchlorobetizene 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-Trichloropropane ND 050 " <br /> 1,2,4-Tnmethylbenzene ND 050 <br /> 1,3,5-Tnmethylbenzene ND 050 " <br /> Vinyl chloride ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 173% 65-130 <br /> Surrogate 1 2-Dichloroethane-d4 115% 60-135 <br /> Surrogate Toluene-d8 104% 70-120 <br /> Surrogate 4-Bromofluorobenzene 96% 70-120 <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 stared results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 28 <br />