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al <br /> A <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> a— ) �707) <br /> Analytical PAX 792-1865 <br /> (707)792-0342 <br /> www sequoiatabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Projecl Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-5(P403188-05)Water Sampled 03/08/04 03 47 Received 03/10/04 08 00 <br /> Tetrachloroethene 1 4 050 ugfl 1 4030563 03/19/04 03/19/04 EPA 8260B <br /> Tnchloroethene 16 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene 10 050 " <br /> Tert-butyl alcohol ND 24 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 31 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl ter(-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 115% 84-122 " <br /> 0urrogate 1,2-Dichloroethane-d4 120% 74-135 <br /> rrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " <br /> VW-7(P403188-06)Water Sampled 03/08/04 07 33 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 2 5 ug/1 5 4030573 03/20/04 03/20/04 EPA 8260B <br /> Tnchloroethene ND 25 " <br /> Tert-amyl methyl ether ND 50 <br /> Benzene ND 2 5 1 <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 50 <br /> 1,2-Dichloroethane 64 2 5 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether 6 3 25 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Dibromofluoromethane 115% 84-121 " <br /> Surrogate 12-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 109% 86-119 " <br /> Sequoia Analytical-Petaluma 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 13 of 34 <br />