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V • 455 McDowell Blvd,Noah Ste D <br /> 1 <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1965 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P307259 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 18 02 <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-4(P307259-04)Water Sampled 07111/031400 Received 07/15/03 09 30 <br /> Benzene ND 50 ug/l 100 3070391 07/18/03 07/19/03 EPA 8260B <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Methyl tert-butyl ether 2200 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dtbromofluoromethane 93% 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 86% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 <br /> MW-5(P307259-05)Water Sampled 07/11/03 13 40 Received 07/15/03 09 30 <br /> Benzene ND 50 ugl] 100 3070391 07/18/03 07/19/03 EPA 8260B <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> WIlethyl tert-butyl ether 3000 50 <br /> uene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dtbromofluoromethane 98% 84-111 " <br /> Surrogate 12-Dichloroethane-d4 87% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 <br /> MW-6(P307259-06)Water Sampled 07/11/03 14 45 Received 07/15/03 09 30 <br /> Benzene ND 050 ug/l 1 3070391 07/18/03 07/19/03 EPA 8260B <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 90% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 85% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 <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 staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 11 <br />