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Sequoia 885 Jarvis Drive <br /> Morgan Hill CA 95037 <br /> Analytical(D (408776 9600 <br /> FAx(aos)782-6308 <br /> www sequoialabs com <br /> • <br /> URS Corporation[Arco 1] Project ARCO##6020,Manteca,CA MPA 1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Protect Number LOCI 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-9(MPA1407-05)Water Sampled 0I/25/06 12 35 Received 01/27/06 08 30 <br /> 1,3-Dichloropropane ND 050 ug/l 1 6B08009 02/08/06 02/08/06 EPA 82606 <br /> 2,2-Dichloropropane ND 20 " <br /> 1,I-Dichloropropene ND 050 „ <br /> Ethylbenzene ND 050 <br /> Hexachlorobutadiene ND 20 " <br /> Isopropylbenzene ND 050 <br /> Methylene chloride ND 050 <br /> Naphthalene ND 5 D <br /> p-Isopropyl toluene ND 050 <br /> n-Propylbenzene ND 050 <br /> Styrene ND 050 " <br /> 1,1,1,2-Tetrachloroethane ND 050 „ <br /> 111,2,2-Tetrachloroethane ND 050 <br /> Tetrachloroethene ND 050 " <br /> Toluene ND 050 <br /> 012,3-Tncblorobonzene ND 050 <br /> 2,4-Tnchlorobenzene ND 050 <br /> 1,1,1-Trichloroethane ND 050 <br /> 1,1,2-Trichloroethane ND 0 50 <br /> Trichloroethene ND 050 <br /> Trichlorofluoromethane ND 050 <br /> 1,2,3-Tnchloropropane ND 050 <br /> I,2,4-Tnmethylbenzene ND 050 " <br /> 113,5-Trimethylbenzene ND 050 „ <br /> Vinyl chloride ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 106% 65-130 <br /> Surrogate 1,2-Drchloroethane-d4 116% 60-135 <br /> Surrogate Toluene-d8 105% 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 28 <br />