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1455 McDowell Blvd, CA Ste <br /> 4D Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> • www sequotalabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 45 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(P309344-07)Water Sampled 09/17/03 02 09 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 3090671 09/30/03 09/30/03 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 _ <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 122% 74-135 <br /> Surrogate Toluene-d8 99% 84-119 <br /> Ourrogate 4-Bromofluorobenzene 98% 86-119 " <br /> VW-IB(P309344-08)Water Sampled 09/17/03 01 30 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 25 ug/I 25 3090671 09/30/03 09/30/03 EPA 8260B <br /> Benzene ND 12 " <br /> Tert-butyl alcohol ND 500 " <br /> Di-isopropyl ether ND 25 " <br /> 1,2-Dichloroethane ND 12 " <br /> Ethanol ND 2500 " <br /> Ethylbenzene ND 12 " <br /> Ethyl tert-butyl ether ND 25 " <br /> Methyl tent-butyl ether 540 12 " <br /> Toluene ND 12 " <br /> Xylenes(total) ND 12 " <br /> Surrogate Dibromofluoromethane 113% 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <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 /> This analytical report must be reproduced in its entirety <br /> Page 8 of 15 <br />