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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 I <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 6100,Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36619 'Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 <br /> Volatile Organic Compounds by EPA Method 8260B <br />' Sequoia Analytical-Petaluma <br /> Reporting <br /> II Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> i VW-6(P306337-04)Water Sampled:06/16/03 06.32 Received:06/17/03 15:00 R-05 <br /> li Tert-amyl methyl ether ND 200 ug/l 200 3060728 06/28/03 06/28/03 EPA 8260B 1 <br /> Tert-butyl alcohol ND 4000 <br /> i <br /> Di-isopropyl ether ND 200 <br /> Ethanol ND 20000 " <br /> i <br /> Ethyl tert-butyl ether ND 200 } <br /> Methyl tert-butyl ether 170 100 " <br /> Surrogate:Dibromofluoromethane 95% 84-122 <br /> j Surrogate: 1,2-Dichloroethane-d4 89% 74-135 <br /> E„ Surrogate: Toluene-d8 91 % 84-119 <br /> VW-20(P306337-05)Water Sampled:06116/0306:31 Received:06/17/03 15:00 R-05 j <br /> Tert-amyl methyl ether ND 500 ug/l 500 3060728 06/28/03 06/28/03 EPA 8260B } <br /> Tert-butyl alcohol ND 10000 <br /> --Di-isopropyl ether ND 500 " <br /> ethanol ND 50000 <br /> f thyl tcrt-butyl ether ND 500 <br /> Methyl tert-butyl ether ND 250 <br />�- Surrogate:Dibromofluoromethane 92% 84-122 i <br /> Surrogate: 1,2-Dichloroethane-d4 82% 74-135 11 11 " <br /> 11 <br /> Surrogate: Toluene-d8 91% 84-119 <br /> Domestic Well(P306337-06)Water Sampled:06/16/03 06:52 Received:06/17/03 15:00 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3060728 06/28/03 06/28/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 <br />` Di-isopropyl ether ND Lo " <br /> Ethanol ND <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 97% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 90% 74-135 <br /> Surrogate: Toluene-d8 96% 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 oasts. <br /> This analytical report must be reproduced in its entirety. <br /> l <br /> Page 6 of 10 <br /> ii t <br />