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41 <br /> 1455 McDowell Blvd,North Ste <br /> i:DSequoia Petaluma,(707)792-1865 <br /> FAX,W Analytical954 <br /> www <br /> labsco2 <br /> www sequo�alabs eom <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 08 50 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result t,rnut Units Dilution Batch Prepared Anatyzed Method Notes <br /> MW-1 (P306136-01)Water Sampled 06/09/03 06 12 Received 06/09/03 08 00 <br /> Ethanol ND 25000 ugA 250 306050I 06/20/03 06/20/03 EPA 8260B <br /> Tert-amyl methyl ether ND 250 " <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dichloroethane ND 120 " <br /> Ethyl tert-butyl ether ND 250 " <br /> Methyl tert-butyl ether 10000 120 " <br /> Surrogate DibromoJluoromethane 102% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 106% 84-119 " <br /> MW-2(P306136-02)Water Sampled 06/09/03 04 25 Received 06/09/03 08 00 <br /> Ethanol ND 100 ug/1 1 3060501 06/20/03 06/20/03 EPA 8260E <br /> Wert-butyl <br /> eri-amyl methyl ether ND 10 alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dichtoroethane ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 100910 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> MW-3(P306136-03)Water Sampled 06/09/03 05 05 Received 06/09/03 08 00 <br /> Ethanol ND 100 ug/l 1 3060501 06/20/03 06/20/03 EPA 8260E <br /> Tert-amyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> I,2-Dichloroethane ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-112 " <br /> Surrogate 12-Drchloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 105% 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 /> is This analytical report must be reproduced in its entirety <br /> Page 7 of 15 <br />