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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> WWW sequoiatabs com <br /> • <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P ElWh 05/25/04 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reportmg <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-6(P404694-13)Water Sampled 04/28/04 09 33 Received 04/29/04 12 20 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4050290 05/12/04 05/12/04 EPA 8260B <br /> Benzene 5 1 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 11 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tent-butyl ether 2 3 050 " <br /> Toluene 058 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 97% 84-1.22 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119Aft " <br /> MW-7(P404694-14)Water Sampled 04/28/04 08 25 Received 04/29/04 12 20 <br /> 'Wert-amyl methyl ether ND 1 0 ug/t 1 4050265 05/12/04 05/12/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 30 050 " ^ <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " ^ <br /> Surrogate Dibromon'uoromethane 110% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 111 % 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 88% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain of <br /> • custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 21 <br />