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a— ) (707) <br /> 1455 McDowell Blvd,North Ste D <br /> Sequo>�a Petaluma CA 94954 <br /> Analytical 792- <br /> FAX(767)792-0342342 <br /> www sequotalabs mm <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Ntunber WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 1145 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Repotting <br /> Analyte Result Limit //nits Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P309344-03)Water Sampled 09/16/03 00 33 Received 09/18/03 08 00 <br /> Tert-arnyl methyl ether ND 1 0 ug/l 1 3090663 09/30/03 09/30/03 EPA 8260B <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 115% 84-122 <br /> Surrogate 1 2-Dichloroelhane-d4 95% 74-135 <br /> Surrogate Toluene-d8 102% 84-119 <br /> Ourrogate 4-Bromofluorobenzene 101 % 86-119 <br /> MW4(P309344-04)Water Sampled 09/16/03 23 17 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 500 ug/l 500 3090663 09/30/03 09/30/03 EPA 82608 <br /> Benzene ND 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> 1,2-Dichloroethane ND 250 " <br /> Ethanol ND 50400 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tert-butyl ether 6500 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromethane 117% 84-122 <br /> Surrogate 12-Dichloroethane-d4 100% 74-135 <br /> Surrogate Toluene-d8 105% 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 6 of 15 <br />