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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,!D (707)792-1845 <br /> Analytical <br /> FAX(707)7420342 <br /> • www sequoialabs 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 Elatth 10/16/03 11 45 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Linut Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-2B(P309344-09)Water Sampled 09/17/03 00 58 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 10 ug/l 10 3090671 09/30/03 09/30/03 EPA 8260B <br /> Benzene ND 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 5 5 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 90 5 0 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 119% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Ourrogate 4-Bromofluorobenzene 100% 86-119 <br /> VW-3B(P309344-10)Water Sampled 09/17/03 01 47 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 10 ug/l 10 3090671 09/30/03 09/30/03 EPA 8260B <br /> Benzene ND 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane 23 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether 210 5 0 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 123 % 74-135 ol " <br /> Surrogate Toluene-d8 98% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 99% 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 9 of 15 <br />