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a <br /> 1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/I2/04 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 /> MW-5(P403188-15)Water Sampled 03/09/04 06 45 Received 03/10/04 08 00 <br /> Tetrachloroethene ND 050 ug/1 1 4030563 03/19/04 03/20/04 EPA 8260E <br /> Tnchloroethene ND 050 " 11 11 <br /> Tert-amyl methyl ether ND 10 1. " <br /> Benzene 34 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 7 1 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 4 6 050 " <br /> Toluene 066 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 119% 84-122 " <br /> rrogate 12-Drchloroethane-d4 131 % 74-135 <br /> urrogate Toluene-d8 111 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 112% 86-119 " <br /> MW-6(P403188-16)Water Sampled 03/09/04 07 40 Received 03/10/04 08 00 <br /> Tetrachloroethene 220 050 ug/l 1 4030563 03/19/04 03/20/04 EPA 8260B E <br /> Tnchloroethene 20 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Drchloroethane 2 l 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 119% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 129% 74-135 " <br /> Surrogate Toluene-d8 106% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 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 /> isThis analytical report must be reproduced in its entirety <br /> Page 18 of 34 <br />