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a__ � (85 <br /> 408) <br /> 8Hil,CA Drive <br /> Sequoia Morgan HdiCA 95037 <br /> 776-9600 <br /> Analytical FAX(409)782-6308 <br /> www sequoialabs com <br /> • <br /> URS Corporation[Arco I] Project ARCO#6020,Manteca,CA MPA1407 <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 Now <br /> MW-8(MPA1407-04)Water Sampled 01/25/06 12 25 Received 01/27/06 08 30 <br /> 1,3-Dichloropropane ND 050 ug/l 1 61308009 02/08/06 02/08/06 EPA 8260H <br /> 2,2-Dichloropropane ND 20 <br /> I,1-Dichloropropene ND 050 <br /> Ethylbenzene ND 050 <br /> Hexachlorobutadiene ND 20 <br /> Isopropylbenzene ND 050 " <br /> Methylene chloride ND 050 " <br /> Naphthalene ND 5 0 " <br /> p-Isopropyltoluene ND 050 <br /> n-Propylbenzene ND 050 " <br /> Styrene ND 0 50 <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 /> 02,3-Trtchlorobenzene ND 050 <br /> 1"1214-Trichlorobenzene ND 0 50 " <br /> 1,1,1-Trichloroethane ND 050 " <br /> 1,1,2-Trichloroethane ND 050 " <br /> Tnchloroethcne ND 050 <br /> Trichlorofluoromethane ND 050 <br /> 112,3-Tnchloropropane ND 050 " <br /> 1,2,4-Tnmethylbenzene ND 050 <br /> 1,3,5-Trimethylbenzene ND 050 <br /> Vinyl chlonde ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 104% 65-130 " <br /> Surrogate 1 2-Dichloroethane-d4 113% 60-135 " <br /> Surrogate Toluene-d8 104% 70-120 i <br /> Surrogate 4-Bromofluorobenzene 92% 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 10 of 28 <br />