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1455 McDowell Blvd North Ste 4 <br /> Sequoia Petaluma, 79 44954 <br /> (707)792-]865 <br /> FAX(707)192-0342 <br /> Analytical www sequoialabs corn <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 Lund Units Dilution Batch Prepared Analyzed Method Note <br /> MW-3(P407064-03)Water Sampled 07/01/04 15 20 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 250 ug/l 250 4070265 07/15/04 07/15/04 EPA 8260B <br /> Benzene ND 120 " <br /> Tert-butyl alcohol 11000 5000 " <br /> Di-isopropyl ether ND 250 <br /> Ethanol ND 25000 " <br /> Ethylbenzene ND 120 " <br /> Ethyl tent-butyl ether ND 250 " <br /> Methyl tert-butyl ether 8800 120 <br /> Toluene ND 120 " <br /> Xylenes(total) ND 120 <br /> Surrogate Dibromofluoromethane 118% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 122% 74-135 " <br /> Surrogate Toluene-d8 109% 84-119 " <br /> WW.urrogate 4-Bromofluorobenzene 101% 86-119 " <br /> . (P407064-04)Water Sampled 07/01/04 14 38 Received 07/02/04 14 55 <br /> Tert-amyl methyl ether ND 1000 U&I 1000 4070265 07/15/04 07/15/04 EPA 8260B <br /> Benzene ND 500 <br /> Tert-butyl alcohol ND 20000 <br /> Di-isopropyl ether ND 1000 " <br /> Ethanol ND 100000 " <br /> Ethylbenzene ND 500 " <br /> Ethyl tent-butyl ether ND 1000 <br /> Methyl tert-butyl ether 24000 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 " <br /> Surrogate Dibromofluoromelhane 121% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 124% 74-135 " <br /> Surrogate Toluene-d8 111 % 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 /> This analytical report must be reproduced in its entirety <br /> Page 5 of 12 <br />