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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> FAX 1r Analytical wwscol7talabs 342 <br /> www sequoialabs cont <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P407064 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 48 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(P407064-05)Water Sampled 07/01/04 14 04 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 100 ugll 100 4070265 07/15/04 07/15/04 EPA 8260E <br /> Benzene ND 50 " <br /> 'Pert-butyl alcohol ND 2000 " <br /> Dr-isopropyl ether ND 100 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 4900 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dibromofluoromethane 122% 84-122 " <br /> Surrogate 12-Drchloroelhane-d4 126% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 98% 86-119 " <br /> MW-6(P407064-06)Water Sampled 07/01/04 13 28 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 10 ugll 1 4070265 07/15/04 07/15/04 EPA 826DB <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 121% 84-122 " <br /> Surrogate 12-Dichloroelhane-d4 125% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <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 /> nis analytical report must be reproduced in its entirely <br /> Page 6 of 12 <br />