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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (747)792-1865 <br /> FAX 7792-0342Analytical wwwsequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P501283 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/27/05 08 37 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(P501283-05)Water Sampled 01/12/05 08 45 Received 01/14/05 14 30 <br /> Tert-amyl methyl ether ND 200 ug/l 200 5010267 01/25/05 01/25/05 EPA 8260B <br /> Benzene ND 100 " <br /> Tert-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 " <br /> Ethanol ND 20000 " <br /> Ethylbenzene ND 100 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether 6200 100 " <br /> Toluene ND 100 " <br /> Xylenes(total) ND 100 " <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 98% 84-1190 " <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 <br /> C " <br /> W-6(P501283-06)Water Sampled 01/12/05 08 10 Received 01/14/05 14 30 <br /> Tert-amyl methyl ether ND 1 0 U 1 5010267 01/25/05 01/25/05 EPA 9260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 111 % 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 96% 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 6 of 12 <br />