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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707 792-1865 <br /> FAX )equoi labs c 42m <br /> www sequoialabs com <br /> URS Corp-Sacramento Protect BP Heritage Site 11194,Tracy,Ca P308015 <br /> 2870 Gateway Oaks Drive Suite 300 Protect number WR36365 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 09/16/03 I7 10 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method At. <br /> MW-4(P308015-09)Water Sampled 07/30/03 14 20 Received 07/31/03 14 40 <br /> Tert-amyl methyl ether ND 25 ug/1 2 5 3080111 08/07/03 08/07/03 EPA 8260B <br /> Benzene ND 12 " <br /> Tert-butyl alcohol ND 50 " <br /> Di-isopropyl ether ND 2 5 " <br /> Ethanol ND 250 <br /> Ethylbenzene ND 12 " <br /> Ethyl tert-butyl ether ND 2 5 " <br /> Methyl tert-butyl ether 49 12 " <br /> Toluene ND 12 " <br /> Xylenes(total) ND 1 2 " <br /> Surrogate Dibromofluoromethane 111% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 114% 74-135 " <br /> W <br /> rrogate Toluene-d8 110% 84-119 <br /> rrogate 4-Bromofluorobenzene 107% 86-119 <br /> MW-5(P308015-10)Water Sampled 07/30/03 12 05 Received 07/31/03 14 40 <br /> Tert-amyl methyl ether ND 2 0 ug/I 2 3080169 08/09/03 08/09/03 EPA 8260B <br /> Benzene 14 10 " <br /> Tert-butyl alcohol ND 40 " <br /> Di-isopropyl ether ND 20 " <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 67 10 " <br /> Toluene ND 10 " <br /> Xylenes(total) ND 10 " <br /> Surrogate DtbromoJluoromelhane 107% 84-122 " " <br /> Surrogate 1 2-Dichloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 109% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> 41equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />