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•� Sequoia 1455 McDowell Blvd, <br /> CA 94954 <br /> � FAX� Analytical 1865) (707)792-(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P307259 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Protect 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-1 (P307259-01)Water Sampled 07/11/03 14 40 Received 07/15/03 09 30 <br /> Benzene ND 500 ug/l 1000 3070391 07/18/03 07/19/03 EPA 8260E <br /> Ethanol ND 100000 1 ' 11 <br /> Ethylbenzene ND 500 " " 1. " <br /> Methyl tert-butyl ether 9900 500 " 11 " " <br /> Toluene ND 500 " <br /> Xylenes(total) 1000 500 " <br /> Surrogate Dtbromofluoromethane 88% 84-121 " 11 " <br /> Surrogate 1 2-Dichloroethane-d4 85% 74-135 " 1 " <br /> Surrogate Toluene-d8 103 % 84-119 11 " <br /> MW-2(P307259-02)Water Sampled 07/11/03 14 20 Received 07/15/03 09 30 <br /> Benzene ND 50 ug/1 100 3070391 07/18/03 07/19/03 EPA 82608 <br /> Ethanol ND 10000 1 " " " <br /> Ethylbenzene ND 50 " " " <br /> WrIlethyl tert-butyl ether 1600 50 11 1. <br /> uene ND 50 11 11 <br /> Xylenes(total) ND 50 " " 11 " <br /> Surrogate Dtbromofluoromethane 90% 84-121 " <br /> Surrogate 12-Dichloroelhane-d4 87% 74-135 1 " <br /> Surrogate Toluene-d8 105% 84-119 1 " <br /> MW-3(P307259-03)Water Sampled 07/11/03 14 30 Received 07/15/03 09 30 <br /> Benzene ND 500 ug/l 1000 3070391 07/18/03 07/19/03 EPA 8260B <br /> Ethanol ND 100000 " <br /> Ethylbenzene ND 500 " <br /> Methyl tert-butyl ether 10000 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 " <br /> Surrogate Dtbromofluoromethane 92% 84-121 " <br /> Surrogate 1 2-Dichloroethane-d4 86% 74-135 11 1 " <br /> Surrogate Toluene-d8 101% 84-119 11 1 " <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 11 <br />