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' a Sequoia 1455 MCDoweQ Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1862 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project. Arco Site 2130,Stockton,CA <br /> P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-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 /> Rq-=g <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-1(P306252-01)Water Sampled 06/11/03 09:35 Received*06!1210311:45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060630 06/24/03 06/24/03 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 84 050 <br /> „ <br /> jSurrogate Dibromofluoromethane 90% 84-122 <br /> Surrogate 12-Ihchloroethane-d4 96% 74-135 „ <br /> Surrogate Toluene-d8 94% 84-119 • " " <br /> VW-2(P306252-02)Water Sampled 06/11/03 05 16 Received 06/12/03 11:45 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060630 06/24/03 06/25/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> ol ND 100 <br /> Win n <br /> 1 Cert-butyl ether ND 1 0 „ <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dibromofluoromethane 95% 84-122 H ^ <br /> Surrogate 1,24)ichloroethane-d4 97% 74-135 <br /> Surrogate Toluene-d8 IN % 84-119 <br /> VW-3(P306252-03)Water Sampled 06/11/03 06 47 Received:06/12/03 11 45 <br /> Tert-amyl methyl ether ND l 0 ug/l 1 3060630 06/24/03 06/25/03 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 tent-butyl ether 2.6 050 <br /> Surrogate Dibromofluoromethane 108% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 104% 74-135 <br /> Surrogate Toluene-d8 106% 84-119 <br /> a Analytical-Petaluma The results in this report apply to the samples analyzes[in accordance with the chain of <br /> custody docwnent Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 1 l of 27 <br />