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1455 McDow PetalumaNCA 9 tq 4 <br /> Sequora (707)792-1865 <br /> FAX Analytical wwseq 7) labsco2 <br /> www sequaialabs cosi <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drrve Suite 300 Project Number lntrim-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 /> I <br /> Analyte Result Limit units Dilution Batch Prepared Analyzed Method Note <br /> VW-7(P409397-14)Water Sampled 09/20/04 13 55 Received 09/22/04 I5 10 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4090752 09/30/04 09/30/04 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Dt-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 20 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether 12 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 122% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 109% 74-135 " <br /> arrogate Toluene-d8 104% 84-119 <br /> rrogale 4-Bromofluorobenzene 114% 86-119 <br /> VW-8(P409397-15)Water Sampled 09/20/04 14 56 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 100 ug/l 100 4090752 09/30/04 09/30/04 EPA 8260B <br /> Benzene 2400 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dichloroethane ND 50 " <br /> Etbanol ND 10000 " <br /> Ethylbenzcne 340 50 <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether ND 50 " <br /> Toluene 110 50 " <br /> Xylenes(total) 200 50 " <br /> Surrogate Dibromofluoromethane 121% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 112% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111% 86-119 " <br /> Sequoia Analytical-Petaluma 77te 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 29 <br />