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3455 McDowell Blvd <br /> Sequoia Petaluma,CA 94454North ate 4 <br /> iW Analytical (707)792-1845 <br /> FAx(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Prolect Arco Site 602Q,Manteca,CA p305040 <br /> 2$70 Gateway Oaks Drtve Suite 300 Protect Number WR36616 Reported <br /> Sacramento C 33 A,958Project Manager Vernon P Elarth OS/15/03 20 19 <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 P305040-01 Water Sampled 04/28/03 15 35 Received 05101/03 16 00 <br /> Tert-amyl methyl ether ND 10 ugll 1 3050175 05/06/03 05/07/03 EPA 8260B <br /> 'Pert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " " " " " " <br /> Surrogate Dibromofluoromethane 107% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 III % 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> MW-6(P305040-02)Water Sampled 04/28/03 14.45 Received 05/01/03 16 00 _ <br /> Tert-amyl methyl ether ND 20 ug/l 20 3050175 05/06/03 05/07/03 EPA 8260B <br /> Ter[-butyl alcohol ND 400 " <br /> i-isopropyl ether ND 20 " <br /> 2-Dibrorioethane(EDB) ND 10 " <br /> 1,2-Dichloroethane ND 10 <br /> Ethanol ND 2000 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 230 10 <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document Unless otherwise staled results are reported on a wel weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of 12 <br />