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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1665 <br /> 92-0342 <br /> Analytical FAXequoi labscon <br /> www sequoialabs cum <br /> URS Carp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Urnit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-3(P409397-03)Water Sampled 09/20/04 11 05 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ugll 1 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol 20 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichlorocthane 3 1 0 50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 123% 84-122 LH <br /> Surrogate 1,2-Drchloroethane-d4 119% 74-135 " <br /> rrogate Toluene-d8 103% 84419 <br /> rrogate 4-Bromofluorobenzene 110% 86-119 " <br /> MW-4(P409397-04)Water Sampled 09/20/04 10 15 Received 09/22/04 15 10 BO,DF <br /> Tert-amyl methyl ether ND 50 ugfl 5 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 <br /> 1,2-Drchloroethane ND 25 <br /> Ethanol ND 500 <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 » <br /> Methyl tert-butyl ether ND 2 5 <br /> Toluene ND 25 <br /> Xylenes(total) ND 2 5 <br /> Surrogate Dibromofluoromethane 124% 84-122 LH <br /> Surrogate 1,2-Dichloroethane-d4 122% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 114% 86-119 " <br /> Sequoia Analytical-Petaluma The results to 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 8 of 29 <br />