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e D <br /> Sequoia 1455 McDowell Blvd,Noah CA 9 954 <br /> ` itrna,CA 44954 <br /> (707)792-1865 <br /> �< Analytical FAX(707)792-0342 <br /> www sequotalabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 1159 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Repotting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW4(P309471-12)Water Sampled 09/24/03 05 35 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3100164 10/07/03 10/08/03 EPA 8260D <br /> Benzene 050 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tent-butyl ether 4 5 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 97% 84-122 <br /> Surrogate 12-Dichloroethane-d4 87% 74-135 ~ <br /> Surrogate Toluene-d8 104% 84-119 " <br /> VW-5(P309471-13)Water Sampled 09/24/03 02 10 Received 09/24/03 08 30 <br /> ert-amyl methyl ether ND 1 0 ug/l 1 3100164 10/07/03 10/08/03 EPA 8260E <br /> Benzene 091 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " ~ <br /> Methyl tert-butyl ether ND 050 ^ <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 ~ <br /> Surrogate Dibromofluoromethane 96% 84-122 ~ " <br /> Surrogate 12-Dichloroethane-d4 85% 74-135 <br /> Surrogate Toluene-d8 106% 84-119 " <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 /> 10 This analytical report must be reproduced in its entirety <br /> Page 12 of 30 <br />