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1455 McDowell Blvd Ste D <br /> Sequoia Petaluma,,CA CA 94454 <br /> (707)792-1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <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 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lnmt Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(P403188-17)Water Sampled 03/09/04 02 46 Received 03/10/04 08 00 <br /> i <br /> Tetrachloroethene 180 050 ugll 1 4030564 03/19/04 03/19/04 EPA 8260E E <br /> Trichloroethene 18 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> j 1,2-Dichloroethane 2 0 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-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 91 % 84-122 " <br /> rrogate 1 2-Dichloroethane-d4 95% 74-135 <br /> urrogate Toluene-d8 96% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 89% 86-119 <br /> MS 1A(P403188-18)Water Sampled 03/09/04 04 48 Received 03/10/04 08 00 <br /> Tetrachloroethene 070 050 ugil 1 4030564 03/19/04 03/19/04 EPA 8260E <br /> Trichloroethene ND 050 " <br /> Tert-amyl methyl ether ND 1 0 " <br /> Benzene 2 2 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 087 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 77 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 93% 84-122 " <br /> Surrogate 1 2-Dlchloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 91 % 86-119 " <br /> I <br /> I <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 19 of 34 <br /> I <br />