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.l <br /> Sequoia 1455 McDowell$lvd,North Stn D <br /> . e Petaluma,CA 94954 <br /> (707)792-1965 <br /> Analytical FAX(707)792.0342 <br /> www seq wWabs eom <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number- Intnm-50293 Reported: <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reportuig <br /> Analyte Result L=t Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P306252-19)Water Sampled 06/1110312.17 Received:0611210311.45 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060397 06/17/03 06/17/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dibromofluoromethane 100% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 103% 74-135 <br /> Surrogate Toluene-d8 90% 84-119 ^ <br /> MW-4(P306252-20)Water Sampled 06/11/03 04 40 Received-06/12103 1145 <br /> Tert-amyl methyl ether ND 10 ug/i 1 3060638 06/25/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Affianol ND 100 <br /> 1 tert-butyl ether ND 10 " ^ <br /> Methyl tett-butyl ether ND 050 <br /> i <br /> Surrogate Dibromofluoromethane 93% 84-122 <br /> Surrogate 12-D:chloroethane-d4 101% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 <br /> MW-5(P306252-21)Water Sampled 06/11/0306:10 Received:0611210311-45 <br /> Tert-amyl methyl ether ND 50 ug/l 5 3060638 06/25/03 06/25/03 EFA 8260B <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 50 <br /> Ethanol ND 500 <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether 4.2 25 <br /> Surrogate Dibromofluoromethane 92% 84-122 <br /> Surrogate 12-Dichloroethane-d4 99% 74-135 ^ " <br /> Surrogate Toluene-d8 105% 84-119O <br /> ^ ^ ^ <br /> uota Analyttcal-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 /> Thus analytical report must be reproduced in its entirety <br /> I <br /> Page 17 of 27 <br />