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+l <br /> a— ) <br /> Sequoia 1455McDowPletaalluud�CA949 4(707)792-1865 <br /> AAnalytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/0311 59 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Repotting <br /> Analyte Result Liinit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-2(P309471-10)Water Sampled 09/24/03 02 21 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ' -. ug/l 1 3100164 10/07/03 10/08/03 EPA 826013 <br /> Benzene 092 050 <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 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 87% 74-135 <br /> Surrogate Toluene-d8 106% 84-119 " <br /> VW-3(P309471-11)Water Sampled 09/24/03 05 18 Recerved 09/24/03 08 30 <br /> Wert-amyl methyl ether ND 1 0 ugfl 1 3100164 10/07/03 10/08/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND l00 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 5 4 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate Dibromofluoromethane 97910 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 88% 74-135 " <br /> Surrogate Toluene-d8 103% 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 /> This analytical report must be reproduced in its entirety <br /> Page I I of 30 <br />