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vd <br /> orth Ste D <br /> 1455 McDowePl�luma,CA 949544 <br /> Sequoia (707)792-1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> www sequofalabs core <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Dnve 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 Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (P309344-01)Water Sampled 09/17/03 01 13 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 100 ug/l 100 3090671 09/30/03 09/30/03 EPA 8260B <br /> Benzene 230 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dtchloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 3600 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 120% 74-135 <br /> Surrogate Toluene-d8 98% 84-119 <br /> 40urrogate 4-Bromofluorobenzene 101 °/a 86-119 <br /> MW-2(P309344-02)Water Sampled 09/16/03 23 55 Received 09/18/03 08 00 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 3090663 09/30/03 09/30/03 EPA 8260D <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtchloroethane ND 0 50 " <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 Dtbromofluoromethane 113% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 92% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 97% 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 in its entirety <br /> Page 5 of 15 <br />