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1455 McDowell Blvd,North Ste D <br /> �1 Sequoia Petaluma,CA94954 <br /> 792-1965 <br /> 9 <br /> (707)792-i B65 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs cum <br /> URS Corp-Sacramento Project BP Heritage Site 1119 1,Stockton,Ca P404678 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project[Manager Vernon P Elarth 05/27/04 15 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-1 (P404678-01)Water Sampled 04/27/04 09 40 Received 04/28/04 12 30 <br /> Tert-amyl methyl ether ND 500 ugll 500 4050236 05/11/04 05/11/04 EPA 9260B <br /> Benzene ND 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 <br /> Ethanol • ' ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tert-butyl ether 11000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromethane 9.5% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> MW-2(P404678-02)Water Sampled 04/27/04 10 20 Received 04/28/04 12 30 <br /> rert-amyl methyl ether ND 100 ugA 100 4050236 05/11/04 05/11/04 DPA 8260B <br /> nzene ND 50 <br /> Tert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 " <br /> Ethanol ND 10000 <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 2800 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 <br /> Surrogate Dibromofluoromethane 92% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 103% 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 4 of 14 <br />