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(D— Sequoia 1455 McDowell <br /> CA 949544 <br /> (707)792-1563 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialahs cam <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P405138 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/27/04 18 30 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> LL <br /> Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-8(P405138-01)Water Sampled 05/05/04 07 10 Received 05/05/04 10 25 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4050459 05/19/04 05/19/04 EPA 8260E <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND ZI 1 0 " <br /> Methyl tert-butyl ether 2 3 r 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 102% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> rrogate Toluene-d8 104% 84-119 " <br /> rrogate 4-Bromofluorobenzene 101 % 86-119 <br /> AW-1 (P405138-02)Water Sampled 05/05/04 08 00 Received 05/05/04 10 25 <br /> Tert-amyl methyl ether ND 10 ug/I 10 4050459 05/19/04 05/19/04 EPA 8260E <br /> Benzene 63 5 0 " <br /> Tert-butyl alcohol ND r 200 " <br /> Di-isopropyl ether ND— lQ " <br /> 1,2-Dichloroethane ND 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND 5 0 " <br /> Ethyl tert-butyl ether ND _ 10 " <br /> Methyl tert-butyl ether 150 5 0 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) 80--" 5 0 " <br /> Surrogate Dibromofluoromethane 102% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 106% 74-135 <br /> Surrogate Toluene-d8 10.5% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> Sequoia Analytical -Petaluma The results to 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 /> This analytical report must be reproduced to its entirety <br /> Page 5 of 11 <br />